Device for electromagnetic transmission control torque (options), the electronic control valve and method for electromagnetic transmission control

 

(57) Abstract:

The invention relates to vehicles, and is intended for use in traction drive. The task is to achieve smooth control operation of the brake and clutch in an automotive transmission due to the high degree of resolution without large increments inclusion. Management is carried out by the pressure of the fluid. The drive is provided by solenoid valves. In one scheme using pulse-frequency modulation pulses of short duration for all fill factors are generated in the presence of feedback with electromagnetic valve or actuator. The electromagnetic system includes a trigger that supplies current to the solenoid. The movement of the solenoid causes the excitation of proteoids and its influence on the magnetic flux and the current in the solenoid is registered and used as a feedback signal to reset the trigger and the current is switched off immediately after the actuation of the valve. In another circuit using pulse-width modulation, the computer control system issues a command to a specific pulse duration. Are monitoring the situation the/P> The present invention relates to control devices that transmit torque in vehicles, and particularly to a method and device for implementing such control by acting through the fluid actuators with solenoid control.

Recently there has been growing interest in expanding the automation chain drive in cars and in particular the management chain drive heavy trucks. It is well known the use of automatic transmissions in passenger cars and light trucks.

Usually the management of the various brakes and clutches in the transmission is carried out using a drive current through a fluid medium, usually hydraulic, but sometimes and pneumatic power which is supplied from the pressure source of the fluid through the solenoid valve with electronic control. This control determines the degree of inclusion in order to ensure a smooth and efficient transfer of torque in the transition between the provisions of enable and disable. In particular, when this control to determine the degree of inclusion of the applied pulse of impulsnogo fill factor. Fast start-up is ensured, thus, when a large pulse width. The result of this control mode is that each pulse of large width causes a large displacement of the actuator, so that in those cases that require moderate or greater degree of inclusion, there is no possibility of soft-start. In addition, the slow incorporation requires a minimum pulse width. If the initial minimum width is set in such a size to be large enough to guarantee inclusion, it will be greater than the minimum required width. Otherwise, you have to start with the momentum with almost zero width and to increase the width of the pulse at each preset extradite him, which leads to a considerable loss of time, until it reaches the effective pulse width. This loss of time in case of use of a closed loop control can lead to instability.

From the application DE N 1505452 B 60 K 23/02, 1969, selected as a prototype.

A device for electromagnetic control the transmission of torque from the engine to the wheels of the vehicle containing the current through a fluid medium, respectively; and exit through the thrust associated with the control input node of the transmission regulation, for example node clutch, and an electronic control unit, configured to generate at the output a modulated pulse signals and the associated setpoint input with a corresponding control device, for example device throttle control, and the output is with the control input of the solenoid valve.

This application known electronic control unit electromagnetic valve in the supply of drive fluid medium containing the generator is modulated by the frequency of the pulse signals, the element control action made with the possibility of perception of the signal generator and the current feed to the solenoid valve.

Also known way solenoid control transmission of torque from the engine to the wheels of the vehicle, whereby the electromagnetic valve in the supply circuit of the actuator from the source of fluid under pressure includes a pulse signal modulated in accordance with the position of the control device.

The present invention is achieving a smooth control torenia with high resolution, avoiding due to this large increments inclusion.

The problem is solved by the fact that according to the invention the electronic control unit is configured to modulate the pulse signals at the frequency of formation of the pulse duration, the minimum required for actuation of the electromagnetic valve and actuation test last feedback signals.

Preferably, the electronic control unit was made to control the frequency of the generated pulses to obtain the desired fill factor of the pulse number.

Preferably, the electronic control unit was designed to generate pulses for turning on the electromagnetic valve and maintain control on the valve until the test completes its operation by feedback signals.

Preferably, the electronic control unit was designed to generate pulses of equal period to activate the electromagnetic valve duration, the minimum required to activate the valve.

Preferably, the electronic control unit was made with the possibility of response Noby electronic control unit was designed to respond to the feedback signals, characterizing occur when moving the electromagnetic valve of proteoids.

Preferably, the electronic control unit includes a computer provided with a program of the task duration of the generated pulses, the minimum required for actuation of the electromagnetic valve and the creation of increments in the actuation of the actuator, the frequency of pulses necessary to obtain the desired fill factor of the pulse number, and configured to respond to the feedback signals characterizing the flow of fluid into the actuator, and a command in a computer to increase the duration of the generated pulses in the absence of feedback signals.

Preferably, the electronic control unit was designed to respond to the feedback signals from the sensor changes the position of the actuator.

Preferably, the electronic control unit was designed to respond to the feedback signals from the sensor changes the pressure of the fluid in the drive.

The problem is solved by the fact that according to the invention the electronic control unit is made with the potential of filling pulse number, the minimum required for actuation of the electromagnetic valve, and actuation test last feedback signals.

Preferably, the electronic control unit was designed to regulate the width of the pulses to obtain the desired fill factor of the pulse number.

Preferably, the electronic control unit has been configured to generate pulses that have a width that is dependent on the desired pulse duty cycle, solenoid valve and maintain control on the valve until the test completes its operation by feedback signals at least until the end of the pulse, while the electronic control unit includes a control pulse-width to achieve the desired fill factor of the pulse number.

Preferably, the electronic control unit includes a computer provided with a program of the task duration of the generated pulses, the minimum required for actuation of the electromagnetic valve and the creation of increments in the actuation of the actuator, and configured to respond to the feedback signals, and the generated pulses in the absence of feedback signals.

The problem is solved also by the fact that according to the invention it introduced the reset tool, designed to react when moving electromagnetic valve, proteoids and complete the supply of current to the solenoid valve.

It is desirable that the body of the formation control was performed responsive to each signal generator.

It is desirable that the body of the formation control had a trigger, one input of which is including the input of this block and is connected to the generator output, the other entrance is off the entrance of the block and is connected to the output means of the reset.

It is desirable that the reset tool had the coil placed at the core of the electromagnetic valve with the ability to detect proteoids arising in the winding control with actuation of the electromagnetic valve.

It is desirable that the reset tool had a current sensor connected in series with the control winding of the electromagnetic valve with the ability to detect proteoids arising in the winding control upon actuation of the electromagnetic valve.

< turning on the electromagnetic valve, and before the pulse modulation control signals regulate the pulse duration before reducing it to the minimum required for actuation of the valve and verify that the actuation of the latter if you have installed the minimum required duration.

Preferably, the feedback signal generated by detection of proteoids arising in electromagnetic valve when it is moved.

It is desirable that the pulse signals to control the solenoid valve modulated by frequency, and the formation of the pulse duration to complete upon receipt of the feedback signal.

It is desirable that the pulse signals to control the solenoid valve were modulated in width, and forming a pulse duration was completed by triggering pulse command signal with a controlled width and termination of the pulse after receiving the feedback signal and the stop command signal.

Preferably, when the control pulse duration and reduce it to the minimum required for actuation of the electromagnetic valve originally issued on the gate pulse duration, obviously menshevikian the duration of the subsequent pulses are triggered.

Preferably, the signal quality feedback received signals representing the change in position of the actuator caused by turning on the solenoid valve.

Preferably, the signal quality feedback received signals representing the pressure change of the fluid in the actuator caused by turning on the solenoid valve.

The invention is further explained by a specific variant of its performance with reference to the accompanying drawings, on which:

Fig. 1 and 2 depict a graphical increasing pressure, illustrating a pulse-width and pulse-frequency modulation, respectively,

Fig. 3 is a block diagram of the transmission control in accordance with the present invention,

Fig. 4 and 5 schematically depict the control system for the Fig. 3,

Fig. 6 depicts a block diagram of the transmission control in accordance with another variant of realization of the present invention,

Fig. 7 depicts a diagram of a computer program used to control according to Fig. 6,

Fig. 8 is a schematic depiction of a circuit implementation of the invention for controlling pulse width modulation,

Fig. 9 is a schematically depicts a system electromagnetic Upravleniye with pulse-width modulation.

Further description of the transmission control is based on the use as an example of one type of control in which the front gear used automatic friction clutch. The invention, however, equally applicable to other variants of realization of transmissions in which to exercise or control the transmission of torque to actuate the brake or clutch is used the pressure of the fluid. Description provides a pressure increase, however likewise can be controlled and reduced pressure. The term "device for torque transmission" is used sometimes to refer to both brake and clutch.

Fig. 1 and 2 are graphic representations of the increase of the pressure, respectively illustrating the effect of pulse-width modulation and pulse-frequency modulation. The modulated signal turns on / off solenoid valve, and the percentage of busy time is expressed by the index fill factor. Each pulse creates a force excitation of the valve, which is maintained for the duration of the pulse. The overall degree of increasing pressure depends on ccii the pulses are delivered at a constant rate, and the width varies from a short pulse at low fill factor up to longer pulses at high fill factors. Since the pulse width has a practically allowable lower limit, there is also a minimum width at higher fill factors; i.e., if the minimum width occurs when the fill factor is 1%, the width at 50% duty cycle should be 50 times larger than the minimum. Moderate fill factor and cause large steps of increasing pressure, as shown in Fig. 1, causing a low degree of resolution. Increasing the fill factor leads to an increase in the magnitude of the steps at the same frequency increments.

When operating with pulse-frequency modulation applied pulses of the same width, and the variation of the fill factor using the frequency change. To achieve small increments of pressure, as shown in Fig. 2, selects a small pulse width and pulse width or period are virtually equal at all frequencies. To obtain a high fill factors apply high frequency. The result is a smooth, gradual change in pressure is of 10 with electromagnetic control, connecting the motor 12 and gear 14 engaged to the drive wheels of the vehicle 16. The clutch 10, which may actually be a multi depicted in the form of a master disk 28 and the driven disk 20, which is pressed against the master drive. The actuator 22 controls the position of the slave drive 20 through a thrust 24. The actuator comprises a pneumatic or hydraulic linear motor, fed by a source of pressure fluid 26 through the solenoid valve 28. Small changes in the movement of the actuator or force dependent on receipt of the actuator with small increments of fluid. The electromagnetic system control 30 under the influence of pedal throttle control 32 determines the required action of the clutch 10 and produces a pulse-frequency modulated signal to obtain a fill factor of the pulse number of the electromagnetic valve, which will provide the desired operation of the clutch. Lines 34 and 36 connect the electromagnetic system control 30 and the electromagnetic valve 28.

For full use of the advantages of the method of pulse-frequency modulation it is necessary that the width of the pulse was so low, permitting requirements solen is its not on every impulse. The method of obtaining the periods of the pulses is sufficiently long to enable the valve is to supply the exciting current to the solenoid, receiving a feedback signal by recording the movement of the armature of the solenoid or the valve and the subsequent interruption of the current. Thus, is provided on the gate, and the pulse duration does not exceed the minimum time expires.

One scheme for the minimum period of the pulse shown in Fig. 4. The electromagnetic part of the system control 32 includes a D-flip-flop 38, the data input of which is connected to a constant voltage source V+, its clock input is connected to the frequency controlled signal to control the fill factor, and its output Q connected to the gate of the employee exciter field-effect transistor 40. One end of the solenoid coil 42 of the electromagnetic valve is connected to the voltage source V+ and the other through the line 34 is connected to the field effect transistor 40, so that the period of the pulse current in the solenoid is equal to the period at the output Q. the Coil 42 is wound on the core 44, and a movable armature 46 (connected to a valve that is not shown) installed in such a way as to respond to changes in magnetic flux in the core of the sensor 48 on the core 44 also reacts to changes in the flow, issuing a signal corresponding to proteoids. The winding 48 is connected through a diode 50 with output reset trigger 38. Each side of the diode 50 is connected to ground via resistors 52 and 54. In the process, arriving at the clock input pulse triggers, including output Q and making a conductive field-effect transistor. Passing through the winding 42 current causes movement of the armature 46 and resulting from proteoids generated in the winding sensor 48 produces a signal on output reset trigger, disabling the output Q and the current flowing through the coil 42. Therefore, the pulse applied to the clock input must be shorter than the period of the output Q.

The second scheme is to establish the minimum period of the pulse shown in Fig. 5 and, like the previous scheme, the excitation current in the coil 42 use the D-flip-flop 38 and the FET 40, but instead of using a separate winding of the sensor, it records the current change in the coil caused by proteoids. The second line 36 connecting the control system 30 with solenoid valve is not required. Field-effect transistor 40 is connected to ground through a resistor 56. The inputs of the amplifier-inverter 58 is connected through a resistor 56, the outputs are connected to ground through the circuit of the differentiator, sotoyama reset trigger 38. Clamping diode 64, enabled through the resistor, does not allow more than one diode drop voltage signal below ground potential. The work is illustrated by the waveform of the current 66 passing through the resistor 56, and the waveform of the voltage differentiator 68 is applied to the output of reset. The current coil is excited by a very short pulse applied to the clock input of the trigger 38. When the gain current of the coil 66, the amplifier produces a negative signal fixed at a small value differentiator. When the movement of the armature causes a small signal proteoids, the current weakens, and the differentiator responsive, giving a positive pulse in the waveform 68, which is enough to return the trigger 38 to its original position. Received status field-effect transistor causes a continued weaker current in the coil to zero. As in the scheme shown in Fig. 4, the width of the excitation pulse valve should be the minimum necessary for reliable operation of the electromagnetic valve and will be the same for a range of frequencies required for operation at the fill factor to 100%.

In Fig. 6 shows another control system of the clutch with ispolzovaniem in Fig. 3, and the actuator 22, the electromagnetic valve 28, the pressure source and the throttle valve 32 is also the same. The electromagnetic system control 30', however, is based on the use of the computer and executes the program of issue of the minimum pulse width for the solenoid valve and another program frequency pulses required to produce the desired fill factor. The control system 30' need information to verify operation of the valve. Information is provided by setting enable, responsive to receipt of the drive fluid. The parameter is given by the position sensor 70, mechanically connected to the actuator 22 or with the clutch 10 and the registering movement of the actuator or clutch, sending a feedback signal to the control system 30'. The feedback signal, or related to the position, or pressure being obtained correspondingly to the pulse command, confirms the actuation of the valve. The feedback signal may then be used to confirm that the pulse command completed successfully. In this case, the pulse signal control device sets the pulse period. Initially as the pulse period of the ass is selected over a long period and so it continues until while period will not be large enough for reliable operation of the valve.

The ow diagram in Fig. 7 illustrates as an example the procedure of generating the minimum pulse 78 for management operations and determine the pulse period. The frequency or timing for each pulse are determined separately by the control system 30' and for each pulse generated interrupt. The first step 80 is to establish for the period Pivalues of Pminthat is expected to be sufficient for the excitation of the solenoid or close to it. At step 82, the pulse period is set equal to the value of Pminso when generating momentum it will have a period Pmin. The receive interrupt is confirmed at step 84, and then in step 86, the program waits for a short period of time, about 20 MS, which is sufficient for operation of the system in response to the switching valve. If after a specified period of time, the feedback signal is not received (step 88), the pulse period Pminincreases in step 90, so that when the next issue of the pulse will be applied over a longer period of the pulse, after which it will be repeated steps 82-88. When the floor is raised to a threshold at step 92. If the change does not exceed the threshold value, the generation of pulses continues without further change of the pulse period Pminbut if the change exceeds the threshold value, the minimum pulse width Pmindecreases in step 94 for the next pulse. Through this program, if the pulse period is insufficient for the success of the solenoid valve, the pulse period is increased to the optimal value, and in the case of a too large increase of the pulse period it reduced. Thus it is guaranteed that the pulse width will be sufficient for the solenoid valve, but is not allowed to significantly exceeded the minimum effective value.

Thus, it can be seen that the advantages of pulse-frequency modulation can be used in devices for torque transfer car transfer mechanisms and efforts for their implementation, there are several technical systems. Pulse-frequency modulation allows to obtain very short pulses activate the solenoid that allows you to smoothly change the pressure of the actuator and, thus, the position SS="ptx2">

The same ability to ensure minimum effective pulse useful in systems of pulse-width modulation, operating at a very low fill factor. The use of minimum excitation pulses with a small error control allows to achieve the highest resolution control, and a larger pulse width at high fill factors, when they occur, substitute the minimum value.

In Fig. 8 illustrates the hardware pulse width modulation applicable to the schemes, as shown in Fig. 4, and in Fig. 5. Pulse-width modulated signal control device 96 is supplied to the clock input of the trigger 38 and to one input of the OR element 98. The output Q of the trigger is also connected to the input of the OR element, so that the signal at the output of the element OR longer than the period of the modulated signal or the period of the signal at the output Q. the Output element OR is connected to control the exciter solenoid and therefore the solenoid valve and the feedback signal received at the output reset trigger, ensure that the output signal Q is interrupted immediately when the displacement of the valve, as described above. Obespecivaet the operation of the valve within the minimum possible time, however, if the input signal is longer, the gate will be enabled for a longer period.

A programmatic approach to pulse-width modulation used in the apparatus shown in Fig. 6, in the best way you can understand, having understood that the controller 30' consists of a controller-based computer or controller 100 and timer 102, mutually connected by lines 104 and 106 shown in Fig. 9. The program is placed into the controller, which compares the reference with the feedback signal to determine the error and submit on line 104 pulse signal with width, to the greatest extent allowing to minimize or eliminate the error. The timer 102 produces pulses with a constant frequency and a width regulator 100. At the beginning of the issuance of each pulse timer issues on the line 106, the interrupt signal. In the controller 100 executes a software sequence 110, shown in Fig. 10. During a first step 112 command is defined by the width of the momentum Pwto correct the error. Then in step 114 determines whether the command Pwless than the value of the initial constant Piplus some small increment Delta. Delta is chosen to ensure surveillance of the valve. If Pwless Pi+ Delta, operation 78', similar to operation 78 in Fig. 7, designed to update the values guaranteed lowest pulse width. The only difference between 78 and 78' is a step 82 where the pulse period for the operation 78' is set as Pmin+ Pw. The pulse output will, therefore, have the lowest guaranteed value of Pmin+ Pw. If in step 114 the team at Pwwill be not less than Pi+ Delta, a value of Poutis set to Pw+ Pmin. A value of Pminbecomes offset, which after merging with Pwat step 116 gives a linear change of Poutwith increasing Pwand a break in the calculation of the pulse width during the transition from operation 78' to step 116 does not occur.

Thus, pulse-width modulation, and pulse-frequency modulation contributes to the regulation of small command pulses so that they are not too small for an effective control of the valve and at the same time were not unnecessary large.

1. Device for electromagnetic control the transmission of torque from the engine to the wheels; the first valve is connected to a source of fluid under pressure, and exit through the thrust associated with the control input node of the transmission regulation, for example node clutch, and an electronic control unit, configured to generate at the output a modulated pulse signals and the associated setpoint input with the corresponding control node, for example node throttle control, and the output is with the control input of the electromagnetic valve, wherein the electronic control unit is configured to modulate the pulse signals at the frequency of formation of the pulse duration, the minimum required for actuation of the electromagnetic valve, and actuation test last feedback signals.

2. The device under item 1, characterized in that an electronic control unit configured to control the frequency of the generated pulses to obtain the desired fill factor of the pulse number.

3. The device under item 1, characterized in that the electronic control unit is arranged to generate pulses for turning on the electromagnetic valve and maintain control on the valve until the test completes its operation on the signals back to the light generating pulses of the same period to activate the electromagnetic valve duration, the minimum required to activate the valve.

5. The device according to p. 3, characterized in that the electronic control unit is arranged to respond to the feedback signals characterizing the movement of the electromagnetic valve.

6. The device under item 5, characterized in that the electronic control unit is arranged to respond to the feedback signals characterizing occur when moving the electromagnetic valve of proteoids.

7. The device under item 1, characterized in that the electronic control unit includes a computer provided with a program of the task duration of the generated pulses, the minimum required for actuation of the electromagnetic valve and the creation of increments in the actuation of the actuator, the frequency of pulses necessary to obtain the desired fill factor of the pulse number, and configured to respond to the feedback signals characterizing the flow of fluid into the actuator, and a command in a computer to increase the duration of the generated pulses in the absence of feedback signals.

8. The device according to p. 7, characterized in that menenia position of the actuator.

9. The device according to p. 7, characterized in that the electronic control unit is arranged to respond to the feedback signals from the sensor changes the pressure of the fluid in the drive.

10. Device for electromagnetic control the transmission of torque from the engine to the wheels of the vehicle containing the current through the fluid actuator, the supply inlet through which a solenoid valve connected to a source of fluid under pressure, and exit through a thrust associated with the control input node of the transmission regulation, for example node clutch, and an electronic control unit, configured to generate at the output a modulated pulse signals and the associated setpoint input with the corresponding control node, for example node throttle control, and the output is with the control input of the solenoid valve, characterized in that what is electronic control unit is configured to modulate the pulse signal width, the formation of the pulse duration at the lowest fill factor of the pulse number necessary for actuation of the electromagnetic valve, and actuation test latter deposits made with adjustable pulse widths to obtain the desired fill factor of the pulse number.

12. The device according to p. 10, characterized in that the electronic control unit is arranged to generate pulses on the inclusion of electromagnetic valves, which have a width depending on the desired pulse duty cycle, and saving control on the valve until the test completes its operation, at least until the end of the pulse, while the electronic control unit includes a control pulse-width to achieve the desired fill factor of the pulse number.

13. The device according to p. 10, characterized in that the electronic control unit includes a computer provided with a program of the task duration of the generated pulses, the minimum required for actuation of the electromagnetic valve and the creation of increments in the actuation of the actuator, and configured to respond to the feedback signals characterizing the flow of fluid into the actuator, and a command in a computer to increase the duration of the generated pulses in the absence of feedback signals.

14. The electronic control unit electromagnetic valve in the supply of drive fluid medium containing Genny with the possibility of perception of the signal generator and applying current to the electromagnetic valve, characterized in that it introduced the reset tool, designed to react when moving electromagnetic valve, proteoids and complete the supply of current to the solenoid valve.

15. The block under item 14, characterized in that the body of formation control is configured to respond to each signal generator.

16. The block under item 14, characterized in that the body shaping control has a trigger, one input of which is including the input of this block and is connected to the generator output, the other entrance is off the entrance of the block and is connected to the output means of the reset.

17. The block under item 14, characterized in that the reset tool has a coil placed at the core of the electromagnetic valve with the ability to detect proteoids arising in the winding control upon actuation of the electromagnetic valve.

18. The block under item 14, characterized in that the reset tool has a current sensor connected in series with the control winding of the electromagnetic valve with the ability to detect proteoids arising in the winding control is triggered when electromagnitism car, whereby the electromagnetic valve in the supply circuit of the actuator from the source of fluid under pressure includes a pulse signal modulated in accordance with the position control unit, characterized in that to produce the feedback signal when you switch the electromagnetic valve, and before the pulse modulation control signals regulate the pulse duration before reducing it to the minimum required for actuation of the valve and verify that the actuation of the latter if you have installed the minimum required duration.

20. The method according to p. 19, wherein the feedback signal is produced by carrying out the detection of proteoids arising in electromagnetic valve when it is moved.

21. The method according to p. 19, characterized in that the pulse signals to control the solenoid valve modulate the frequency, and the formation of the pulse duration to complete upon receipt of the feedback signal.

22. The method according to p. 19, characterized in that the pulse signals to control the solenoid valve modulate the width, and the formation of the pulse duration to complete by triggering pulse command signonsandiego signal.

23. The method according to p. 19, characterized in that when the control pulse duration and reduce it to the minimum required for actuation of the electromagnetic valve originally issued on the gate pulse duration, obviously the smaller the minimum required, and in the absence of a feedback signal, confirming the inclusion of the valve, increase the duration of the subsequent pulses are triggered.

24. The method according to p. 23, characterized in that the signal quality feedback signal representing the change in position of the actuator caused by turning on the solenoid valve.

25. The method according to p. 23, characterized in that the signal quality feedback signal representing the pressure change of the fluid in the actuator caused by the inclusion of the electromagnetic valve.

 

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