Windshield wiper motor control system

FIELD: transport engineering; windshield wipers.

SUBSTANCE: proposed system contains shunt-wound dc motor connected to plus terminal of car electric circuit whose field winding 2 is provided with series resistor 3, three-position two-way mode changeover switch 4 and limit switch 5 whose first terminal is connected with minus terminal of armature of dc motor 1 and circuit of field winding 2. system is furnished additionally with mode changeover relay 6, power switch 7, generator 8 with timer 9, variable resistor 10, first fixed resistor 11 and second fixed resistor 12, diode 13, first capacitor 14 and second capacitor 15.

EFFECT: provision of optimized operation of windshield wiper system.

1 dwg

 

The invention relates to the field of transport engineering, in particular to the system steklosetki vehicle.

Known automatic system steklosetki [USSR Author's certificate No. 822463, IPC 60S 1/08, 1981, USSR author's certificate No. 2127676, IPC 60S 1/46, 1999], which are connected in parallel to the standard system and are triggered or level of contamination of the windshield, or the speed of its change. Such systems steklosetki characterized by a common drawback - there may be unexpected for the driver of the operation system, when for cleaning in automatic mode is not necessary, and, as a consequence, the dispersion of his attention, or the ability of manifestation on his part unpredictable reactions. This can cause traffic accidents.

Closest to the present invention is a standard system steklosetki [Technical description of the car UAZ], containing the direct current motor parallel excitation, connected to plutonomy wire vehicle electrical system, the circuit of the excitation winding which included additional resistor, bidirectional mode switch three position and limit switch, whereby in the first position of the mode switch, the armature of the motor and the excitation winding are connected to m is nuculoma wire vehicle electrical system, additional resistor is shorted-circuited, thus providing a slow speed brush cleaning system, in the second position of the mode switch the excitation winding through the extension resistor and the armature of the motor are connected to the negative wire of the onboard vehicle network, providing high speed brush cleaning system, in the third position of the switch the motor is disconnected from the negative wire on-Board network and cleaning of the glass is not produced.

The disadvantages of the known systems are discrete adjust the speed of rotation of the motor system steklosetki and, as a consequence, the impossibility of choosing the optimal mode of cleaning the glass of the car.

The technical result is aimed at optimizing the performance of the system steklosetki.

The technical result is achieved in that in a system containing a direct current motor parallel excitation, connected to plutonomy wire vehicle electrical system, the circuit of the excitation winding which included additional resistor, bidirectional mode switch three position and the limit switch, the first output of which is connected to the minus output of the armature of the DC motor and the circuit of the excitation winding, the system additionally introduced the relay p is clucene modes, power key, generator, containing a timer, a variable resistor, the first and second constant resistance, diode, first and second capacitors. And the first output winding of the relay switch modes connected to plutonomy wire-Board network of the vehicle, the first and second position of the mode switch, the first output of the power key is connected to the minus output of the armature of the DC motor and the circuit of the excitation winding and the second output is connected to the minus wire of the vehicle, the control input of the power key is connected to the output of the generator, in the first position of the mode switch, the second output winding of the relay switch operating modes and a second output switch connected to the minus wire of the vehicle, the first fixed resistance connected to the first output variable resistance, a second output of which is connected with the second fixed resistor and normally closed contact of the first group of relay switching, and its movable contact to the first input of the timer and the switching contact of the first group of relay switching, normally open contact which is connected to the anode of a diode, the cathode of which is connected with the second output of the second constant resistance, a second input of the timer, the first capacitor and h is through the normally closed contacts of the second group relay switch modes with the second capacitor, second, the findings of the first and second capacitors are connected to the negative output of the power supply of the timer and to the minus wire of the vehicle, the first output of the first constant resistance connected to plutonomy the power output of the timer and to plutonomy wire to the vehicle electrical system.

Distinctive features of the prototype is that the system additionally introduced relay switching, power key, generator, containing a timer, a variable resistor, the first and second constant resistance, diode, first and second capacitors, and the availability of new ties between the newly introduced and previously used by the nodes in the system.

Comparative analysis of the proposed system with the existing technical solutions shows that the proposed system has several significant advantages: improved steklosetkoj, which is achieved by fine adjustment of the speed of rotation of the armature of the motor in the first mode and the fine adjustment of the pause between the operation of the brushes in the second.

The drawing shows an electrical functional diagram of the device.

Control system wiper motor includes a motor 1 DC parallel excitation, connected to plutonomy wire vehicle electrical system, the circuit of the winding 2 opened with the help of which included additional resistor 3, bidirectional switch 4 operating modes on the three position and limit switch 5, the first output of which is connected to the minus output of the motor armature 1 DC circuit 2 coil excitation relay 6 switching modes, a power switch 7, the generator 8, containing the timer 9, a variable resistor 10, the first 11 and second 12 constant resistance, diode 13, the first 14 and second 15 capacitors, and the first output winding of the relay 6 switching modes connected to plutonomy wire-Board network of the vehicle, the first and second switch position 4 modes of operation, the first output power key 7 is connected to the minus output of the motor armature 1 DC circuit 2 coil excitation, and its second output is connected to the minus wire of the vehicle, the control input of the power key 7 is connected to the output of the generator 8, in the first position of the mode switch, the second output winding of the relay 6 switching modes and the second output terminal of the switch 5 is connected to the minus wire of the vehicle, the first fixed resistance 11 connected to the first output variable resistance 10, the second terminal of which is connected to a second fixed resistor 12 and the normally closed contact of the first group of relay 6 switching modes, and its movable contact with the first input is m timer 9 and the switching contact of the first group of relay 6 switching modes, normally open contact which is connected to the anode of the diode 13, the cathode of which is connected with the second output of the second constant resistance 12, the second input of the timer 9, the first capacitor 14 and through the normally closed contacts of the second group relay 6 switching modes with the second capacitor 15, the second the findings of the first 14 and second 15 capacitors are connected to the negative output power timer 9 and the minus wire of the vehicle, the first output of the first constant resistance 11 is connected to plutonomy the power output of the timer 9 and plutonomy wire to the vehicle electrical system.

The device operates as follows.

When switching switch 4 modes in the first position of the relay 6 switching modes is activated, also the bottom of the scheme output limit switch 5 is disconnected from the minus side of the network. The motor 1 is supplied from the first output of the power key 7 (drain field-effect transistor). The mode of operation of the power key 7 is determined by the signal at its control input coming from the output of the generator 8. In this mode, the generator 8 operates as a pulse-width modulator. Indeed, the charge breathalyser capacitor 14 is the following circuit: positive output side of the network, the resistance 11, the upper circuit portion of the variable resistance 10 (before the engine is Eremenko resistance), the diode 13 and the capacitor 14, and the discharge capacitor 14, a variable resistor 12, the bottom of the scheme portion of the variable resistance 10 (up to engine variable resistance), built-in key timer 9. The total time cycle charge-discharge remains constant, and the duty cycle of the generated pulses varies when you move the cursor variable resistance 10.

The average value of the DC voltage to the motor 1 can be determined from the relation [General electrical engineering. Edited Athbhliain. HP: Energoatomizdat, 1986. - 591 C.]:

where U is the average voltage across the motor 1, UBAT- voltage vehicle electrical system, τ - the duration of the positive pulse at the output of the timer 8, ƒ - generation frequency of the timer 8.

As follows from equation (1), the voltage at the motor 1 changes smoothly when the smooth adjustment of the duty cycle of the pulses from the timer 8. Such adjustment and is carried out by changing the position of the slider of the variable resistance 10. As a result, the rotation speed of the motor 1 changes smoothly, since the rotation speed of the direct current motor and its voltage supply connected relationship [General electrical engineering. Edited Athbhliain. HP: Energoatomizdat, 1986. - 591 C.]:

where U is the supply voltage of the motor, I is the current absorbed by the motor, R is the resistance of the winding, With constructive constant direct-current motor, f is the magnetic flux.

As a result of application of this regulation, the driver can smoothly control the speed of movement of the brush cleaning system glass of a vehicle, which allows you to choose the optimal data traffic conditions traffic brushes.

When switching switch 4 modes in the second position of the relay 6 switching off, also the bottom of the scheme output limit switch 5 is connected to the minus side of the network. The motor 1 is supplied from the first output of the power key 7 (drain field-effect transistor). The mode of operation of the power key 7 is determined by the signal at its control input coming from the output of the generator 8. In this mode, the generator 8 operates in the timer mode with adjustable pause between pulses of a given duration. Indeed, when releasing the relay 6 switching modes of the first group of contacts excludes from the charging circuit diode 13 and the bottom of the scheme portion of the variable resistance 10. When switching of the relay contacts 6 switching modes in parallel to the capacitor 14 is switched on, the capacitor 15 is great the first capacitance and the total capacitance is large. Charge paralleled timing capacitors 14 and 15 is the following circuit: positive output side of the network, the resistance 11, the upper circuit portion of the variable resistance 10 (up to engine variable resistance), resistance 12, the capacitors 14 and 15, and its discharge capacitors 14 and 15, the resistance 12, the integrated key of the timer 9. The discharge time remains constant, and the duty cycle of the generated pulses varies when you move the cursor variable resistance 10. Since the capacitance of the capacitor 15 is great enough, the duration of the positive pulse at the output of the timer 9 is sufficient to ensure the movement of the brush until the circuit limit switch 5, which is provided by one full cycle of movement of the brushes and their subsequent stop in the right position after unlocking limit switch 5.

The next cycle of steklosetki will begin only upon receipt of the next positive pulse from the generator 8. The interval between pulses is governed by the driver manually using the variable resistance 10, depending on road conditions.

Therefore, the proposed device allows for work in two modes to select an optimal mode of cleaning glass in practically all weather conditions.

Sources of information

1. USSR author's certificate No. 822463, IPC 60S 1/08, 1981.

2. USSR author's certificate No. 2127676, IPC 60S 1/46, 1999.

3. Technical description of the car UAZ.

4. General electrical engineering. Edited Athbhliain. HP: Energoatomizdat, 1986. - 591 S.

Control system wiper motor, containing a direct current motor parallel excitation, connected to plutonomy wire vehicle electrical system, the circuit of the excitation winding which included additional resistor, bidirectional mode switch three position and the limit switch, the first output of which is connected to the minus output of the armature of the direct current motor and a chain winding, characterized in that the system further introduced relay switching, power key, generator, containing a timer, a variable resistor, the first and second constant resistance, diode, first and second capacitors, and the first output winding of relay switching work connected to plutonomy wire-Board network of the vehicle, the first and second position of the mode switch, the first output of the power key is connected to the minus output of the armature of the direct current motor and the circuit of the excitation winding and the second output is connected to the minus wire there are side the network, the control input of the power key is connected to the output of the generator, in the first position of the mode switch, the second output winding of the relay switch operating modes and a second output switch connected to the minus wire of the vehicle, the first fixed resistance connected to the first output variable resistance, a second output which is connected with the second fixed resistor and normally closed contact of the first group of relay switching, and its movable contact to the first input of the timer and the switching contact of the first group of relay switching, normally open contact which is connected to the anode of a diode, the cathode of which is connected with the second output of the second constant resistance the second input of the timer, the first capacitor and through the normally closed contacts of the second group of the relay switch operating modes - with the second capacitor, the second the findings of the first and second capacitors are connected to the negative output of the power supply of the timer and to the minus wire of the vehicle, the first output of the first constant resistance connected to plutonomy the power output of the timer and to plutonomy wire to the vehicle electrical system.



 

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