JPH03500318A - Monitoring device that monitors the electronic accelerator pedal position controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Monitoring device for monitoring the position controller of the electronic accelerator pedal Conventional technology The invention relates to an electronic accessory for use in a motor vehicle of the type defined in claim 1. The present invention relates to a monitoring device that monitors a cell pedal.

A device that protects and monitors electronic accelerator pedals in cars has already been released to the public in Germany. It is described in Publication No. 3430077. The device uses a potentiometer to An accelerator pedal position sensor is coupled to the accelerator pedal and outputs a target value. is input to the first controller. This controller has a The actual value obtained from the potentiometer is input, which causes the controller to adjust the control deviation is generated and operates the servo motor for the butterfly valve via the output stage. this The conventional mechanical adjustment of the butterfly valve is thus performed electronically. Doi According to Publication No. 3430077, the control deviation is calculated by subtracting the actual value from the target value. and is input to the second controller to eliminate the dynamic characteristics of the control loop. A manipulated variable is formed. When this manipulated variable exceeds a predetermined limit value, the window comparator The controller detects this and activates a fault detection device.

The present invention is an improvement to such a device.

Advantages of invention In the monitoring device according to the present invention as described in the characterizing part of claim 1, the slave Monitor the basic control loop of the position controller in the circuit and identify continuous control errors. This has the advantage of being able to check it if it does.

drawing The present invention will be described in detail according to embodiments with reference to the drawings.

FIG. 1 shows a conventional electronically controlled butterfly valve, and FIG. Figure 3 shows the digital configuration of the basic configuration of Figure 1 and Figure 2. 2 shows a modification according to the present invention.

Description of examples First, to explain with reference to the conventional configuration shown in Fig. 1, the pedal l to the accelerator is the potential. The accelerator pedal position sensor 2 is mechanically coupled to an accelerator pedal position sensor 2 consisting of a yometer.

The resistance value of the potentiometer is proportional to the setting angle of the accelerator pedal. Therefore, The resistance value of the accelerator pedal position sensor 2 is connected to the accelerator pedal position sensor 2. A target value αD is formed for the controller 3. Controller 3 is an automobile butterfly The output stage 4 of the servo motor 5 that drives the valve 7 is controlled. The servo motor 5 is Mechanically coupled to the butterfly valve 7 and the butterfly valve position sensor 6 There is. This position sensor 6 is a potentiometer similar to the accelerator pedal position sensor 2. controller 3 according to the resistance value of the butterfly valve position sensor 6. is supplied with an actual value aA indicating the position of the butterfly valve 7. known to those skilled in the art A description of the control loop is omitted here to simplify the drawing.

The controller 3 shown in FIG. 1 controls the output stage 4 according to the analog control deviation. It is a PrD controller. However, the transient response characteristics of closed-loop control exhibit attenuating characteristics. If so, the monitoring device should be a switching controller that only considers the sign of the control deviation. Other types of controllers can also work.

Therefore, the present invention is limited to the embodiment of butterfly valve position control illustrated in FIG. It is not limited to.

FIG. 2 shows a device that is a digital arrangement of the known device shown in FIG. Similar parts are given the same reference numerals. In the digital configuration shown in Figure 2, the access The analog signal from the pedal position sensor 2 is converted to an 8-bit digital signal by 8. is applied to the summing element 9 of the PTD controller 3. PID controller is approximately 5 ms The one with the scanning time is selected. The PID controller 3 to generate polarized output signals M+ and M- to control the operating direction of the servo motor 5. Ru. The butterfly valve position sensor 6 (not shown in FIG. 2) is connected to the actual butterfly valve position sensor 6 (not shown in FIG. It generates a feedback signal that indicates the position of the valve, and this signal is a 10-bit digital signal. The signal is converted into a digital signal and input to the controller 3.

Next, referring to FIG. 3, in the configuration of the present invention, the base shown in FIG. The operating state of this mask control circuit is monitored by the slave circuit 12, and continuous control errors are detected. The presence or absence of - is checked.

Continuous control errors a) When basic control is interrupted, b) When there is no integral component in the controller 3, C) regulating devices, i.e. motors 5, butterfly valves 7 or position sensor elements; d) When the battery voltage is too low Occurs when one or more of the following faults are present:

The mask circuit 10 generates a signal α corresponding to the target value and actual value of the angle of the butterfly valve. D and αA (analog or digital) are supplied to the slave circuit 12. both signals The difference αE is formed in the subtraction circuit 14. The target is set by the integrator 16 of the slave circuit. The difference αE between the value and the actual value is integrated. The output of the integrator is input to the limit detector 18 Therefore, an error condition is determined when the integrator output exceeds a predetermined limit value. be done. In this case, an "error present" signal is sent to the mask circuit 10 via line 20. sent to.

The integrator 16 operates when the difference signal αE is zero and when the difference between the target value and the actual value changes sign. When a zero crossing occurs, the zero outputs a reset signal to the integrator. It is reset via line 22 by detector 24.

If the adjustment device does not move in the forward direction, the stoppage may be due to freezing. so the error is not detected, therefore this error occurs if the engine is warmed up , will be automatically canceled. In this state, to prevent the device from detecting a failure, For this purpose, a signal "control device not activated" is generated in the mask circuit 10, and this signal is signal is applied to the integrator reset line 22 via line 26, causing the integrator to reset to zero. Set.

Furthermore, when starting a car, there is a voltage drop in the battery output, so The fly valve will no longer be able to move to the desired position. This condition is recognized as an error. If the battery voltage is low, the car will not start properly. Therefore, A “Battery Voltage Low” signal is formed and returns the integrator to zero via line 26. Let it set.

In this way, when the battery voltage is low and the regulator does not operate, the system The system does not recognize error conditions and does not impair usability.

, 2~J.

, Usu 2 , Fiq-1 international search report -1h-1-m, PCT/EP BEI100611 International Investigation Report

Claims (1)

[Claims] 1) an accelerator pedal position sensor (2) mechanically coupled to the accelerator pedal (1); ), a servo motor (5) that drives an automobile's butterfly valve (7), and a butterfly valve (7). A butterfly valve position sensor (6) mechanically coupled to the fly valve and an actuator Target value obtained from cell pedal position sensor (2) and butterfly valve position sensor Process the actual value obtained from (6) to control the output stage (4) of the servo motor (5) A monitor that monitors the electronic accelerator pedal (1) of a motor vehicle with a controller (3) that In the device, The target value of the opening angle of the butterfly valve is determined by the subtracter (14) of the slave circuit (12). A control deviation (αE) between (αD) and the actual value (αA) is formed, An integrator integrates the control deviation (αE), and the integrator integrates the control deviation (αE) when the control deviation is zero or When the sign changes, it is reset to zero and the integration of the control deviation starts again. When the output of the integrator exceeds a predetermined limit value, a limit detector (18) detects the master circuit. (10) An electronic accelerator pedal for an automobile characterized in that the presence of a failure is notified at A device that monitors the 2) A zero detector (24) is connected to the output of the subtracter (14), and the control deviation (αE) becomes zero or changes sign, the integrator (16) on line 22 1. Visual device. 3) To reset the integrator to zero when the car battery voltage is below a predetermined value. Claim 2, characterized in that the signal is applied to the line (22) at monitoring equipment. 4) Set the integrator to zero when the butterfly valve or its position sensor does not operate. Claim characterized in that a signal is applied to the line (22) for resetting. The monitoring device according to scope 2 or 3.