JP2014000938A - Sudden acceleration control device utilizing capacitor characteristics - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sudden acceleration control device for preventing the frequent occurrence of serious accidents caused by a mistake in pressing an accelerator pedal instead of a brake pedal while driving in a parking lot.SOLUTION: When an accelerator pedal is pressed instead of a brake pedal by mistake, a change rate (a differential coefficient) of an accelerator signal is higher than usual due to an accelerator pedal 21 being pressed more strongly and quickly than the usual operation, and the output voltage of a conversion circuit 4 for a sudden acceleration control device 1 becomes large. When the output voltage becomes higher than a comparison voltage 8 of a comparator 5, a flip flop 10 is preset and a relay 11 is driven. By driving the relay 11, an accelerator signal A23 normally outputted to ECU 25 is switched to voltage 7. If the voltage 7 is preset at 0 or at the idle voltage, the output to ECU 25 is reduced and then a sudden acceleration is controlled.

Description

  It is a device that limits the acceleration so that the vehicle does not accelerate suddenly when the accelerator pedal is depressed suddenly by mistake.

  A mechanical switch is provided to detect the rotation angle when the accelerator pedal is depressed.

  Accelerator pedal rotation angle is detected from the accelerator signal and processed by a microcomputer.

The above technique complicates the installation work of the apparatus and the apparatus itself.
The present invention has been made to eliminate the above drawbacks.

  If the accelerator signal is v from the operational equation i = C × dv / dt of the capacitor characteristics, a sudden change in the accelerator signal can be detected by monitoring the current i generated in the capacitor.

  In the electronically controlled vehicle for controlling the prime mover with an accelerator signal corresponding to the depression amount of the accelerator pedal, the sudden acceleration limiting device according to claim 1 is provided between the accelerator sensor and an ECU (electric computer unit) for controlling the prime mover. The capacitor detects the rate of change in the accelerator signal (differential coefficient on the time axis) when the accelerator pedal is depressed suddenly, not the amount by which the accelerator pedal is depressed, and determines that it is abnormal when it exceeds a predetermined value. A new signal generated by the acceleration limiting device is output to the ECU as an accelerator signal.

  Rapid acceleration of the vehicle can be stopped or limited by setting a new signal generated by the rapid acceleration limiting device to 0 or outputting it to the ECU as a small accelerator signal.

  By constantly monitoring the rate of change of the accelerator signal (differential coefficient on the time axis) with a capacitor, an abnormality can be detected in the initial stage before the accelerator pedal is depressed deeply (solid stepping), and the rapid acceleration of the vehicle can be limited.

  It is a block diagram of the present invention.   3 is a flowchart of the present invention.

Hereinafter, modes for carrying out the present invention will be described.
In the block diagram of FIG. 1, the accelerator signal A (23) is connected to the capacitor via the buffer (2), and the current generated in the capacitor is always monitored.

The accelerator signal A (23) output from the accelerator sensor unit (22) according to the depression amount of the accelerator pedal (21) is connected to (S1) of the rapid acceleration limiting device (1).
The accelerator signal B (24) is connected to (S2) of the rapid acceleration limiting device (1).
In this state, the change in the accelerator signal A (23) is constantly monitored by the capacitor (3), and the relay (11) is not operating in normal times. Therefore, the accelerator signal A (23) corresponding to the accelerator pedal depression amount. Is directly output to the ECU (25) as the accelerator signal B (24).

  One input of the comparator (5) contains the output of the conversion circuit (4), and the other input contains the voltage (8).

  When the accelerator pedal (21) is depressed, a current i is generated in the capacitor (3). The stronger the accelerator pedal (21) is depressed, the larger the current i becomes. The current i is converted into a voltage by the conversion circuit (4), and its output is connected to the input of the comparator (5). When the output voltage of the conversion circuit (4) exceeds the voltage (8) input to the other input of the comparator (5), the comparator (5) presets the flip-flop (10) and the relay (11) Driven.

When the relay (11) is driven, the accelerator signal A (23) normally input to the ECU (25) is switched to the voltage (7) and output to the ECU (25).
If the voltage (7) is set to 0 or an idling voltage in advance, the output to the ECU (25) is also reduced, so that rapid acceleration can be limited.

  One input of the comparator (6) contains the accelerator signal A (23) and the other input contains the voltage (9).

  When the depression of the accelerator pedal (21) returns, the accelerator voltage A (23) drops. When the voltage value falls below the voltage (9), the comparator (6) clears the flip-flop (10), and the relay (11) Turn off and return to the original normal.

  This returns to the normal standby state.

  Since each vehicle has different characteristics, the set voltage, voltage (7), voltage (8), and voltage (9) can be changed with a variable resistor or the like.

DESCRIPTION OF SYMBOLS 1 Rapid acceleration limiting device 3 Capacitor 11 Relay 20 Vehicle 21 Accelerator pedal 23 Accelerator signal A
25 Onboard ECU

Claims (1)

  In an electronically controlled vehicle that controls the prime mover with the accelerator signal corresponding to the amount of accelerator pedal depression, the accelerator signal voltage is applied to the capacitor, the current generated at that time is detected, and when the current value exceeds a predetermined amount, the accelerator It is a device that limits a sudden acceleration of the vehicle by outputting a pseudo signal with the signal stopped or lowered to the ECU.

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