JPS6065236A - Accelerator control device for vehicle - Google Patents

Abstract

PURPOSE:To improve safety ever so better, by detecting an acclerator position in an electrical manner, while installing a compensation circuit in position between a detector for a device controlling the opening of a throttle valve and an opening desired valve generator of the throttle valve, and making it generate such a signal as corresponding to a state of accelerator restoration in time of disconnection of a signal line. CONSTITUTION:A signal out of an accelerator position detector 100 attached to an accelerator pedal 101 is transmitted to a desired value generating device 104 via a compensation circuit 102, and a throttle valve 106 is controlled for its on-off operation by an on-off driving device. The compensation circuit 102 outputs a signal corresponding to an accelerator position signal when a signal line 103 is normal, but in time of discronnection in the signal line 103, the circuit 102 outputs anoth signal corresponding to a state of accelerator restoration and closes the throttle valve 106. Therefore, reckless driving in a car is prevented from occurring whereby driving safety is improvable.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention electrically detects, for example, the movement of an accelerator pedal, and remotely controls a throttle valve drive source electrically or fluidically based on this detection signal. This invention relates to a new vehicle accelerator control device.

(Prior art and its problems) The present applicant has already proposed this type of vehicle accelerator control device in Japanese Patent Application No. 57-182066, which electrically detects accelerator pedal movement, and based on this detection signal. A configuration has been proposed in which a throttle opening target value signal is output to control a throttle valve drive source such as a motor or a hydraulic mechanism.

According to this J: Una vehicle accelerator control device, optimal driving characteristics can be easily obtained under a wide range of driving conditions by appropriately setting and changing the transfer function of the signal transmission system from the accelerator pedal to the throttle valve. be able to.

However, in the vehicle accelerator control device configured in this way, the signal cable to the accelerator position detector that detects the movement of the accelerator pedal and the throttle position detector that detects the opening/closing operation of the throttle valve may be disconnected or have a poor connection. If this occurred, it was considered that the above-mentioned optimal operating characteristics could not be obtained.

(Objective of the Invention) The present invention was made under such circumstances, and the first object of the present invention is to improve the safety of the vehicle in the event of a disconnection of the signal cable leading to the accelerator position detector. It is about improving sexuality.

A second object of the present invention is to improve the safety of a vehicle when a disconnection or poor connection occurs in a signal cable leading to a throttle position detector.

(Structure of the Invention) The structures of the first and second inventions of the present application will be described with reference to claim correspondence diagrams shown in FIGS. 1 and 2.

In FIG. 1, an accelerator position detector 100 detects a detection signal corresponding to the operating position of an accelerator operator 101. As shown in FIG.

The compensation circuit 102 is supplied with a detection signal from the accelerator position detector 100 via a signal cable 103, outputs a signal corresponding to the detection signal when the cable 103 is normal, and outputs a signal corresponding to the detection signal when the cable 103 is normal. outputs a signal corresponding to the return state of the accelerator operator 101.

The target value generating means 104 is the output of the compensation circuit 102.]
A predetermined relationship is set between the throttle opening target value and the throttle opening target value, and a throttle opening target value signal is output corresponding to each output value.

Further, the opening/closing driving means 105 drives the throttle valve 106 to open/close so that the target throttle opening value and the current opening value match.

In addition, in FIG. 2, the accelerator position detector 100 is
This is similar to FIG. 1.

The target value generating means 104 is connected to this accelerator position detector 10.
A predetermined relationship is set between the detection signal obtained from 0 and the throttle opening target value.

A throttle opening target value signal corresponding to each output signal is output.

The throttle position detector 107 outputs a detection signal corresponding to the open/close position of the throttle valve 106.

The compensation circuit 108 is supplied with a detection signal from the throttle position detector 107 via a signal cable 109.
Further, when the cable 109 is normal, a signal corresponding to the detection signal is outputted, and when the cable 109 is broken, a signal corresponding to the fully open throttle condition is outputted.

The servo driving means 110 uses the throttle opening target value obtained from the target value generating means 104 and the compensation circuit 108.
The throttle valve 106 is driven to open and close so that the output signals coincide with each other.

(Explanation of Examples) The present invention will be explained in detail below.

FIG. 3 is a block diagram showing an embodiment of the vehicle accelerator control device according to the present invention.

In the figure, an accelerator pedal 1 serving as an accelerator operator 101 is connected to a pedal potentiometer 2 serving as an accelerator position detector 100, which is composed of, for example, a rotational angle type resistance potentiometer, one end of which is connected to a constant voltage source VCC. .

This pedal potentiometer 2 outputs an analog voltage 1 corresponding to the amount of depression (displacement) of the accelerator pedal 1 from a movable terminal, as shown in FIG. 4 (A>), for example.

The movable terminal of pedal potentiometer 2 is connected to signal cable 3 (1
03) to the compensation circuit 4 (102). This compensation circuit 4 consists of a Zener diode 5 inserted between the signal cable line and the ground, limits the maximum voltage of the voltage V1 from the pedal potentiometer 2, and outputs it to the target value generating means 6 (104). When the voltage from the pedal potentiometer 2 disappears, it functions at the same time as the ground line is connected to the target value generating means 6.

The target value generating means 6 converts the output signal from the compensation circuit 4 into an A/
An A/D converter 7 that converts into a D converter, and this A/D converter 7
The microcomputer 8 detects the depression of the accelerator pedal 1 based on the output of the microcomputer 8, and calculates a target value for the throttle valve opening, which will be described later, based on this.

Note that the microcomputer 8 has a built-in D/A converter (not shown) that performs D/Δ conversion on the calculated target value and outputs the result.

A drive circuit 9 for amplifying this target value is connected to the target value generating means 6. This drive circuit 9 includes a servo motor 1 that drives the throttle valve 10 (106) to open and close it.
Connected to 1. A valve opening potentiometer 12 is connected to the throttle valve 10 as a throttle position detector 107, which outputs a detection signal according to the valve opening position of the throttle valve 1o, and is composed of, for example, a rotational angle type resistance potentiometer.

This throttle position detector 12 has one end connected to a constant voltage source Vc.
As shown in FIG. 4(B), a voltage 2 which is inversely proportional to the throttle opening is outputted from the movable terminal connected to the terminal C.

The detection signal of this valve opening potential: ] 12 is transmitted via the signal cable 13 (109) to the compensation circuit 14 (108
)It is connected to the.

This compensation circuit 14 consists of a Zener diode 15 inserted between the signal cable line and the ground, and the voltage V? from the valve opening potentiometer 12? The maximum voltage is limited and outputted to the A/D converter 7 of the target value generating means 6, and when the voltage from the valve opening potentiometer 12 disappears, the earth line is connected to the target value generating means 6. function at the same time.

In addition to the above-mentioned function 1, the microcomputer 8 interpolates the valve distance target value using the input signal V2 from the valve opening potentiometer 12, and generates a signal to close the throttle valve 7 when V2 decreases significantly. It has a function to output.

That is, the target value generating means 6, the drive circuit 9, and the servo motor 11 constitute a servo drive means 110.

In addition to the servo driving function, the microcomputer 8 may also have a function of outputting a signal that prevents the throttle distance target value from matching the opening degree current value.

In addition, the pedal potentiometer 2 and the valve opening potentiometer 12
The other ends of each serve as a common terminal and are connected to, for example, the ground line of the ice body of the apparatus.

Next, the operation of the vehicle accelerator control device of the present invention will be explained.

When the accelerator pedal 1 is depressed, the pedal potentiometer 2 linked to the accelerator pedal 1 operates, and the voltage divided by the movable terminal changes, but the voltage v1 whose maximum voltage is limited by the Zener diode 5 of the compensation circuit 4 is applied to the A/D converter 7.

On the other hand, when the throttle valve 10 is driven, the valve opening potentiometer 12 outputs the voltage v2 corresponding to the position of the throttle valve 10 as a detection signal, and the maximum voltage is limited by the Zener diode 15 of the compensation circuit 14. V
2 is added to the A/D converter 7.

Voltage V1. from the compensation circuits 4, 14 applied to the A/D converter 7. V2 is Δ/D converted by an A/D converter and input to the microcomputer 8.

In the microcomputer 8, as shown in FIG. 5, the value of Vl is read in step (1), and the value of
Read the value of 2.

Next, in step (3), the relationship between the pedal stroke stored in advance and the target throttle opening/closing degree is determined by referring to the polytable (Fig. 6), and interpolation calculations are performed on the reference results to determine the relationship between the pedal stroke and the target throttle opening/closing degree at that point. Calculate the corresponding throttle opening target value.

In step (4), the read value of V2 is phase-aligned with ■1 to create a converted signal V2N (see Figure 7), and in step (6), the difference signal ER between the converted signal V2N and V+ is generated.
Further, in step (6), the signal is outputted to the drive circuit 9 as a control signal such that the throttle opening target value and the signal of the compensation circuit 11 match.

Note that the conversion signal may be a VAN obtained by adjusting the phase of the read Vl to V2.

Then, pedal potentiometer 2 and valve opening potentiometer 1
2 through the signal cables 3 and 13, the drive circuit 9 connects to the servo motor 11.
Since the throttle valve 7 is driven normally, the throttle valve 7 is driven to open and close normally.

Next, if a disconnection occurs in the signal cable 10 to the pedal potentiometer 2, that is, if the VCC line or the v1 line is disconnected, the Zener diode 5 of the compensation circuit 4 connects the A/D converter 7 with the A signal similar to that input is input.

As can be seen from FIG. 4(A), this corresponds to the case where the accelerator pedal 1 is not operated, that is, it is in the return state.

Therefore, in the microcomputer 8, step (3)
), a throttle opening target value signal that fully closes the throttle valve 10 is output, and in step (6), such a control signal is applied to the drive circuit 9, and the throttle valve 7 is fully opened, thereby preventing the vehicle from running out of control. can be suppressed.

On the other hand, if a disconnection occurs in the signal cable 13 to the valve opening potentiometer 12, that is, if the Vcc line or the ■2 line is disconnected, the Zener diode 15 of the compensation circuit 14
Therefore, the same signal as when the second line is grounded is input to the A/D converter 3. This is shown in Figure 4 (B)
As can be seen, this corresponds to the case where the valve opening potentiometer 12 is placed in the fully open state.

Therefore, in the microcomputer 8, step (5)
), a throttle opening target value signal for fully closing the throttle valve 10 is output, and is applied to the drive circuit 9.
Since the throttle valve 7 is fully closed, runaway of the vehicle is similarly suppressed.

Note that the voltage V2 from the valve opening potentiometer 12 is processed as a signal whose lowest voltage indicates the fully open position of the throttle valve 10, so even if the throttle valve 10 is fully open, the control system is moved further toward closing. Operate. Therefore, the throttle valves 1 to 10 do not operate in the listening direction, and the throttle valves 1 to 10 do not operate in the listening direction.
0 is maintained at full throttle for 6 hours.

In the above embodiment, resistance type pedal potentiometers were used as the pedal potentiometer 2 and the valve opening potentiometer 12, but in these cases, it is possible to use an absolute coat type encoder or the like that outputs an absolute value voltage. can be,
It is sufficient if each encoder is configured as shown in FIGS. 4(A) and 4(B).

Furthermore, the present invention connects the pedal potentiometer 2 and the valve opening potentiometer 12 to the accelerator pedal 1 and the throttle valve 10, and simultaneously handles an example in which the signal cable 3゜13 to the pedal potentiometer 2 and the valve opening potentiometer 12 is disconnected. Indicated.

However, in the present invention, each effect can be achieved even if it is only one of them. In either case, it is possible to drive the throttle valve 10 at the target value.

When the pedal potentiometer 2 is connected to the accelerator pedal 1, it is also possible to use a staple motor, etc., or a hydraulic or pneumatic acticoator, in addition to the servo drive means, as the opening/closing drive means for the throttle valve 10. l1ff may be achieved by an opening/closing driving means that opens and closes the throttle valve so that the target opening value and the current opening value match.

(Effects of the Invention) As explained above, according to the present invention, there is provided an accelerator control system for a vehicle in which the throttle valve can be remotely controlled electrically and via the drive system in accordance with the displacement of the accelerator operator. t
In the Il device, the safety of the vehicle can be improved when a disconnection or poor connection occurs in the signal cable leading to the accelerator 4:Lfa detector.

Furthermore, it is also possible to improve vehicle safety 11- when a disconnection or poor connection of the signal cable leading to the throttle position detector occurs.

In addition, even in the present invention, by appropriately setting the transfer function of the signal transmission system from the accelerator pedal to the throttle valve, it is possible to easily achieve optimum driving characteristics under a wide range of driving conditions. It goes without saying.

[Brief explanation of the drawing]

1 and 2 are claims correspondence diagrams explaining the present invention, FIG. 3 is a block diagram showing one embodiment of the vehicle accelerator control device of the present invention, and FIG. 4(A). (B) shows the accelerator position detector and thrower 1-
Figures 5 and 6 are flowcharts and pre-stored tables showing the configuration of the program executed by the microcomputer in Figure 3, and Figure 7 is the diagram shown in Figure 3. FIG. 2 is a diagram illustrating phase conversion executed by the microcomputer of FIG. 1・・・・・・・・・・・・・・・・・・Accelerator pedal 2・・・・・・・・・・・・・・・Pedal potentiometer 3.13,103,109・...Signal cable 4
．． 14,102.10'8... Compensation circuit 5.15...
・・・・・・Zener diode 6.104・・・・
・Target value generation means 7・・・・・・・・・・・・・・・
・・・△/D converter 8・・・・・・・・・・・・・・・
・・・Microcomputer 9・・・・・・・・・・・・
...... Drive circuit 10.106... Throttle valve 11 ...... Servo motor 12
・・・・・・・・・・・・ Valve opening potentiometer 10
0......Axle position detector 101
......Accelerator operator 105...
......Opening/closing drive means 107...
...Throttle position detector 110...
... Servo drive means patent applicant Nissan Motor Co., Ltd.

Claims (2)

[Claims] (1) An accelerator detector that outputs a detection signal corresponding to the operation position of the accelerator operator: The detection signal from the accelerator detector is supplied via a signal cable, and when the cable is normal, the accelerator detector outputs a detection signal corresponding to the operation position of the accelerator operator. a compensation circuit that outputs a signal corresponding to the signal, and outputs a signal corresponding to the return state of the accelerator operator in the event of a wire break; a target value generating means for outputting a throttle valve opening target value signal; and an opening/closing drive means for driving the throttle valve to open and close so that the target opening value and the current opening value match. Accelerator control device. (2) An accelerator detector that outputs a detection signal corresponding to the operation position of the accelerator operator: Outputs a throttle distance target value signal in which a predetermined relationship is set with the detection signal obtained from the accelerator detector. A target value generating means; A throttle detector that outputs a detection signal corresponding to the opening/closing position of the throttle valve; A detection signal is supplied from the throttle detector via a signal cable, and when the cable is normal, the detection signal is output. a compensation circuit that outputs a signal corresponding to a fully open throttle state when the wire is disconnected; and an opening target value signal obtained from the target value generating means and an output signal of the compensation circuit. 1. A vehicular accelerator control device comprising: a servo drive means for controlling the opening and closing of a throttle valve so that I''1j coincide with each other.