Method and device for controlling a sensor

FIELD: technology and equipment for controlling sensor, preferably, sensor for measuring value, characterizing pressure of air fed into internal combustion engine.

SUBSTANCE: sensor error is detected on basis of absence of changes of its output value in response to appropriate change of certain work parameter, for example, amount of injected fuel. Sensor control can be performed, for example, only if some certain operation modes are present. In case of sensor breakdown, equivalent value is used for controlling engine. Such an equivalent value can be generated on basis of values, characterizing operation mode of internal combustion engine, for example, can be calculated on basis of rotation frequency and/or amount of injected fuel. Also as aforementioned equivalent value, value, received and saved previously, prior to sensor breakdown, can be utilized.

EFFECT: possible reliable correction of errors and breakdowns in operation of sensor, including those during operation of internal combustion engine in dynamic mode.

2 cl, 3 dwg

 

The level of technology

The present invention relates to a method and apparatus for monitoring sensor according to the restrictive parts of the respective independent claims.

Method and device for monitoring a sensor measuring a quantity that characterizes the pressure in the internal combustion engine (ice) air, is known from the application DE 4032451 A1. This publication describes the various ways and methods of control pressure sensor boost. The output signal of this sensor charge pressure is compared with a certain reference value. As this benchmark is used primarily output signal of the second sensor charge pressure. In another embodiment, in certain modes of engine operation, for example in the range of low load and low rotational speed of the shaft, the output signal of the sensor charge pressure is compared with the sensor signal of the atmospheric pressure. When the engine is in steady-state conditions the measured value is compared with the value calculated on the basis of fuel consumption and speed of the motor shaft.

The disadvantage of the said application is necessary to use a second sensor or that the control is only possible in certain operating conditions of the engine. If the engine rarely works in these modes, what about under certain conditions the engine long enough to work with a faulty sensor charge pressure.

Advantages of the invention

Proposed in the invention the solution, according to which the faulty sensor is identified on the absence of changes its output value in response to a corresponding change in the working of the parameter characterizing the amount of injected fuel, allows to reliably detect faults and malfunctions in the operation of such a sensor, including during operation of the engine, in the dynamic mode. As a working parameter, which characterizes the injection quantity, can be used in various sizes. Thus, in particular, as such a work setting can be used in characterizing different torque values, for example the value set by the driver torque, and the control signals supplied to the Executive bodies of regulators, fuel consumption, or other values that are processed by the control unit of the engine. It is most preferable to use proposed in the invention is a method for monitoring sensor charge pressure, measuring the pressure in the engine air. However, proposed in the invention method can also be used in relation to any other sensors.

Faults of a particular type, for example due to icing of the sensor, appear only in certain modes of engine operation, and therefore control is Attica it is preferable to carry out depending on the presence of certain modes of operation.

Thus, in particular, the icing of the sensor occurs only in a certain range of temperatures. In accordance with this health monitoring sensor is advisable to realize in the case when the value characterizing the temperature of the air is less than some threshold value.

Reliable and/or high-precision control of serviceability of the sensor is possible only for certain values of the frequency of rotation of the motor shaft and/or the quantity of fuel to be injected. In accordance with this control it is proposed to carry out in the case when the speed and/or the amount of injected fuel have specific values.

When detecting a sensor failure in the following for engine control is most preferable to use the equivalent value. This is equivalent to the value of the most easy to calculate on the basis of the rotation speed of the engine and/or quantity of fuel to be injected. The use of such equivalent values provides the possibility of further operation of the internal combustion engine even with a faulty sensor, the accuracy of the control operation of the internal combustion engine is reduced only slightly.

Other preferred embodiments of the invention are given in the dependent claims.

Drawings

Below the invention is more on the discovering considered on the example of some variants of its implementation with reference to the accompanying drawings, showing:

figure 1 - diagram of the measurement system charge pressure,

figure 2 is a detailed diagram of the system control charge pressure and

figure 3 is a diagram illustrating the process of forming the equivalent value of the charge pressure.

Description of embodiments of the invention

Below we propose the invention the method is illustrated on the example of a sensor charge pressure. However, it should be noted that in the invention the solution is not limited in its application only to control such sensors. Moreover, proposed in the invention method is applicable to any sensor output signal which varies in accordance with changes in a working setting. Proposed in the invention method is applicable, in particular, to sensors designed to measure air flow, or some correlated (interconnected) with boost pressure value or characterizing this pressure value. Proposed in the invention method is applicable primarily to the sensor air flow.

In figure 1 the position marked 100 sensor measuring pressure, and the associated analog-to-digital Converter (ADC). This ADC is issued corresponding to the boost pressure signal UP, which comes in a block 110, which is conventionally marked Dnepropetrovskaya characteristical this unit, the specified value is converted to a signal PR, which in turn is fed to the filter 120. The output signal P of the filter 120 through the first switching element 130 is passed to the block 140 of the control, in which the signal is subjected to further processing for appropriate control motor or mounted on the internal combustion engine of the Executive or regulatory body.

To the second input of the first switching element 130 is fed the output signal PS of the modeling unit 135. This modeling unit 135 based on the various values calculated modeled boost pressure PS.

The control switching element 130 is the first control unit 150. In accordance with this, in the presence of the detected fault of the first control unit 150 switches the first switching element 130 in the position in which the block 140 control receives the output signal PS of the modeling unit 135. In the first control unit 150 are processed signals of various sensors 160, characterizing, for example, the injection quantity QK and/or the rotational speed N of the shaft of the engine. In addition, to control for the presence of a sensor failure in the control unit 150 preferably to process the output signal PR obtained by Dnepropetrovs characteristic 110. Alternative or in addition, can also be subjected to direct processing of the output signal R of the filter is 120, accordingly, the output signal UP of the ADC sensor 100.

Broken line in the drawing shows a diagram corresponding to another variant embodiment of the invention. In this embodiment, between the first switching element unit 130 and 140 control provided by the second switching element 170, which is the second control unit 180. When a fault is detected on the monitored sensor of the second control unit 180 switches the second switching element 170 in the position in which the block 140 control receives the output signal RA block 175 delays. This delay unit when the malfunction detection sensor ensures the preservation of the current values of the last of all obtained before the fault detection values.

The sensor output signal issued by the analog-to-digital Converter, is converted in accordance with Dnepropetrovs characteristic 110 into a corresponding pressure value PR. Processing the first and/or second control units of various signals allows you to troubleshoot various kinds.

If a failure is detected to control the internal combustion engine unit 140 controls in the future through appropriate control of the first switching element 130 and/or the second switching element 170 can be used equivalent value is s PS or such equivalent values can be used a previously saved value of RA. To this end, the block 175 delays, the last of all obtained to detect malfunctions of the sensor values. In the following it is stored in block 175 delay prior value of RA is used to control the internal combustion engine.

The first and/or second control units allow you to troubleshoot various kinds. So, for example, may provide a range check signal changes, comparing the signal UP, respectively, the signal PR with a certain minimum and/or maximum values. In addition, in certain operating modes of the internal combustion engine may provide a verification of the reliability of using an additional sensor, such as an atmospheric pressure sensor.

According to the invention the validity check can also be carried out based on the amount of fuel to be injected and/or other working parameter which has a significant impact on the boost pressure. A similar test on the validity preferably so that a malfunction of the sensor can be identified by the absence of change of its output signal in response to a corresponding change of the working parameter of the engine.

As a working option is preferable to use a quantity that characterizes the amount of injected fuel. With this purpose you can use setpoint to which icesta injection and/or control action, used to control affecting the quantity of fuel to be injected by the Executive body. For example, this parameter can be used the duration of the control pulse supplied to the solenoid or electromagnetic valve nozzle or a piezoelectric actuator. Such a control method is described in more detail below with reference to figure 2.

When detected, the appropriate fault-controlled sensor switching element 130 is switched to the position in which the further processing flows simulated equivalent signal PS. This is controlled by the efficiency of the sensor, the output of which is out of order instead of the output signal further uses the equivalent signal PS. This is equivalent to the signal generated on the basis of the quantities characterizing the mode of operation of the engine. Then formed in this way is subjected to filtering in the filter element of which is the link delay. In more detail the process of forming the equivalent values discussed below with reference to figure 3.

Figure 2 in the example shown in more detail the structure of the first control unit 150. In certain operating modes of the internal combustion engine measured value of the charge pressure UP may remain unchanged despite the change is giving the actual charge pressure. Such a sensor fault may be due to it freezing or icing. To detect such a malfunction of the sensor can be achieved by appropriate control in accordance with the scheme shown in figure 2.

According to the invention the efficiency of the sensor is controlled only when the engine is operating in certain modes. With such a mode of operation in which the temperature of inlet air below a certain threshold TLS, and the frequency of rotation of the motor shaft and the injection quantity are within certain ranges of values, after the change of the sign of the value, which characterizes the change in quantity of fuel to be injected, the current value of the quantity of fuel to be injected and the current value of the charge pressure is stored as the previous value QKA and RA, respectively. Simultaneously turns on the timer. After some time the expectations are formed difference QKD between the previous stored value QKA and the next current value QK of the quantity of fuel to be injected. Accordingly determined and the value of PD occurred during this waiting time changes of the charge pressure.

If the difference between the quantity of fuel to be injected is greater than some threshold value is their QKDS, the magnitude of the change of the charge pressure must exceed some threshold value PDS. Violation of such conditions indicate a malfunction of the sensor.

Figure 2 as an example, shows one embodiment of such a control unit. In the first comparator 200 receives the output signal TL sensor 160 with temperature corresponding to the temperature of the charge air. To another input of the comparator 200 unit 205 thresholds comes threshold temperature TLS. The output signal of the comparator 200 enters the element And 210. The second comparator 230 receives the output signal obtained in block 220 based on the multivariate characteristics, the input of which is supplied characterizing the rotational speed N of the motor shaft the signal from the sensor 160A speed. In addition, in block 220 based on the multivariate characteristics of the processed value of QK, which characterizes the injection quantity and which preferably comes from a block 160b regulation of fuel consumption. To another input of the comparator 230 is supplied threshold BPS generated by the generator 235 thresholds. A corresponding output signal of the comparator 230 is also supplied to the element And 210.

The value of QK is also provided in block 250 to determine its sign and the filter 260. The output signal nl is 250 ka determination shall be filed in counter 270 time and the first memory 262 and the second memory 265.

The output signal of the filter 260, first, served with a positive sign directly in combinational element 285 and, secondly, flows through the first memory 262 with a negative sign to the second input of this combinational element 285. With the release of this combinational element 285 in the switching element 275 receives the value of QKD. The output signal QKD this switching element 275 is supplied to the third comparator 280, to the other input of which receives the output signal QKDS knob 285 thresholds. The output signal of the comparator 280 is also supplied to the block 240 processing.

The output signal P of the filter 120, first, enters with a positive sign directly in combinational element 287 and, secondly, through the second memory 265 enters with a negative sign to the second input of this combinational element 287. With the release of this combinational element 287 switching element 276 is given the value of PD. The output signal PD of this switching element 276 is fed into the fourth comparator 290, to the other input of which receives the output signal PDS knob 295 thresholds. The output signal of the comparator 290 is also supplied to the block 240 processing.

In the first comparator 200 measured temperature value TL charge air is compared with the threshold value of the TLS. E. what if the measured temperature TL charge air less than the threshold value TLS in element 210 And the appropriate signal is received. In block 220 by multiparameter characterization at least on the basis of the rotational speed and/or quantity of fuel to be injected is formed parametric value characterizing the mode of operation of the engine. This parametric value is compared in the comparator 230 to a threshold BTS. If this parameter value characterizing the operation mode of the internal combustion engine is greater than a threshold BPS, the element 210 And the appropriate signal is received. In both conditions, i.e. if the temperature of the charge air is below a threshold TLS and simultaneously, the motor operates in one of certain modes, possible control over the functionality of the sensor.

The above logic module, consisting of Comparators 200 and 230, control devices 205 and 235 thresholds, block 220 with multivariate characteristic and element And allows you to control issued by the sensor signal depending on the availability of certain modes of engine operation. While such control is carried out only when the temperature of the supercharging air is less than the threshold value, and the rotational speed and/or injection quantity have specific values.

In block 250, the determination of the sign is checked, did the sign of the value, the characteristic is karisawa changes the amount of fuel to be injected. In other words, at this stage it is checked, passed through a zero value taken by the time derivative of the quantity characterizing the amount of injected fuel. If this derivative is passed through a zero value, in the memory 262 as prior value QKA the same as the current (actual) value of the quantity of fuel to be injected. Accordingly in the second memory 265 as prior value RA saves the current pressure value. The most preferable value of the quantity of fuel to be injected before saving it be subjected to filtration using a filter 260.

Simultaneously with the detected change of the sign of the above derivative is enabled, the counter 270 time. However based on the current QK and prior QKA of the quantity of fuel to be injected fluid element 285 is formed the difference between QKD, reflecting the change in the amount of fuel to be injected since the last change of sign. Similarly in combinational element 287 is formed corresponding to the differential value PD for pressure, which characterizes the change in the charge pressure since the last change of sign.

As soon as the counter time reach a certain limit value, i.e. after a certain time expect the project since the last change of sign, the differential signal QKD is compared in the comparator 280 threshold value QKDS. Similarly the difference between PD for charge pressure is compared in the comparator 290 with the corresponding threshold PDS. If each of these values of the difference, one of which QKD is the difference between a quantity of fuel to be injected, and the other PD is the difference between a charge pressure is larger than the corresponding threshold value, the control unit does not issue reports of a sensor failure. If the value of the difference between QKD for the quantity of fuel to be injected more than the corresponding threshold value, and the value of the difference PD to the charge pressure is less than the relevant threshold PDS, then the control unit generates a fault signal of the sensor. In this case, the control unit 150, i.e. block 240 processing, receives a corresponding signal to the switching of switching element 130 in a different position.

The above approach illustrates only one of the possible embodiments of the invention. While there may be other variations in its implementation, for example, can be used to control other steps of the program. Of significant importance is the fact that a sensor fault is detected by the absence of changes in the charge pressure in response to a corresponding change some R the operating parameter, for example, the quantity of fuel to be injected. If after a change of sign of the value, which characterizes the injection quantity, the change in the amount of fuel to be injected correlated with the magnitude characterizing the boost pressure, this condition indicates the absence of a fault in the sensor.

Instead of fuel can be used, and other characterizing the amount of injected fuel quantities, i.e. quantities that depend on fuel consumption, or depending on which is determined by the fuel consumption. So, for example, as such values can be used for characterizing the load value that characterizes the torque value and/or controlling the magnitude of the flow regulator fuel.

Figure 3 depicts the structure of the modeling unit 135. While discussed above in the description of figure 1, the elements indicated in figure 3 the same positions. The signal N from the sensor 160A rotation frequency and the signal QK, which characterizes the injection quantity, enter in block 300, which is conventionally denoted by multivariate characteristic and the output value of which through the filter 310 enters the switching element 130. This is the same value as the rotational speed N through block 320, which is conventionally marked Dnepropetrovskaya characteristics, and combined the include element 330 also served in the filter 310. To the second input of this combinational element 330 is fed the output signal from block 340 to determine the sign.

In multivariate characteristic 300 is stored depending on the operation mode of the internal combustion engine, the charge pressure P. Is stored in the multivariate characteristic value corresponds to the pressure in a static state. To account for the dynamic States of the filter 310. This filter 310 is preferably in the form of a proportional filter (link) with delay 1-th order (PT1) and reflects the character of change of pressure over time when changing the operation mode of the engine. Transfer characteristic of such a filter is most preferable to set a variable depending on the mode of operation of the engine. This purpose is provided, in particular, Dnepropetrovskaya feature 320, in which based at least from speed N stored value, which is determined by the transfer characteristic of the filter 310 by weighing its time constant.

In addition, this transfer function is determined by the block determining the sign depending on the sign of the value, which characterizes the change in the charge pressure, sets a correction value, which is adjusted output signal obtained using multiparameter features 320. Pointed to by the m block definition of the sign is determined, increase Lee, respectively is reduced if the boost pressure. As input values received in the block definition of the sign, it is preferable to use an output signal obtained by multivariate characteristics 300. It is most preferable to further provide two oneparameter features 320 and to use one or the other of them depending on increases or decreases the pressure.

1. The control method of the sensor, the first sensor for measuring quantities characterizing the pressure supplied to the internal combustion engine (ice) air, characterized in that the sensor fault is identified on the absence of changes its output value in response to a corresponding change in the working of the parameter characterizing the amount of injected fuel.

2. The method according to claim 1, characterized in that the control sensor is carried out depending on the availability of specific modes of operation.

3. The method according to any of the preceding paragraphs, characterized in that the control is carried out in the case when the value characterizing the temperature of the air is less than some threshold value.

4. The method according to any of the preceding paragraphs, characterized in that the control is carried out in the case when the speed and/or the amount of injected fuel are identifying the data values.

5. The method according to any of the preceding paragraphs, characterized in that after the change of the sign of the value, which characterizes the change in the quantity of injected fuel, such a change in the quantity of fuel to be injected correlated with the magnitude of the pressure.

6. The method according to any of the preceding paragraphs, characterized in that after a certain period of time after the change of the sign of the value, which characterizes the change in the quantity of injected fuel, the current value of the quantity of injected fuel is compared with the value of the quantity of injected fuel in the moment changes sign.

7. The method according to any of the preceding paragraphs, characterized in that when detecting the malfunction of the sensor to control the use of equivalent value.

8. The method according to any of the preceding paragraphs, characterized in that the equivalent value determined on the basis of the rotational speed and/or quantity of fuel to be injected.

9. Device for controlling the sensor, first sensor for measuring quantities characterizing the pressure supplied to the internal combustion engine (ice) air, characterized in that the means allowing to detect a malfunction of the sensor does not change its output value in response to a corresponding change of the working parameter characterizing the number of the quantity of injected fuel.



 

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