JPH11180271A - Pedal position detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the mistake in the judgement of the existence of the pedal depressing by outputting the depressing amount of the pedal by a stroke sensor, and setting an output value of the stroke sensor as an initial value of the detection of the pedal depressing amount in a state that a vehicle is stopped when the operation is performed in a state that the petal is not depressed. SOLUTION: A clutch stroke sensor 2 outputs a signal of a voltage value corresponding to the depressing amount of a clutch pedal 10. Further a CPU 8 reads the output voltage of the clutch stroke sensor 2 when a state that a set switch 6 is ON is detected when the clutch pedal 10 is not depressed, and writes the output of the clutch stroke sensor 2 at the present time on an EEPROM 7 as the initial value when the zero speed is detected by a speed sensor 18. The completion of the setting of the initial value is informed by a buzzer 5. As the result, the correct value at the present time, can be obtained even when the output value of the stroke sensor is changed by the change of temperature, the vehicle vibration, the aged deterioration or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pedal position detecting device, and more particularly to a pedal position detecting device suitable for use in a hill start assist device.

[0002]

2. Description of the Related Art Hitherto, a slope start assist device has been developed in which a braking force is maintained when a vehicle is stopped by depressing a brake pedal to reduce a troublesome brake operation (for example, Japanese Patent Application Laid-Open No. HEI 3-121959). Gazette). In this slope start assist device, the braking force is maintained on condition that the clutch pedal is depressed, and the braking force is released on condition that the clutch pedal is returned. For this purpose, a clutch stroke sensor (potentiometer) for detecting the position of the clutch pedal is provided. Based on the output value of the clutch stroke sensor when the clutch pedal is not depressed, it is determined whether or not the clutch pedal is depressed. I have. The output value of the clutch stroke sensor when the clutch pedal is not depressed is set in advance by a worker at a vehicle assembly line or a repair shop, and the result is stored in a memory as an initial value.

[0003]

By the way, in such conventional clutch position detection, the output value of the clutch stroke sensor when the clutch pedal is not depressed is stored in a memory as an initial value. The output value of the clutch stroke sensor may change due to temperature change, vehicle vibration, aging, and the like, and there is a problem that the determination of whether the clutch pedal is depressed or not is erroneously made.

Accordingly, the present invention provides a pedal position which does not erroneously determine whether or not the pedal is depressed even if the output value of a stroke sensor for detecting the position of the pedal changes due to temperature change, vehicle vibration, aging, and the like. It is an object to provide a detection device.

[0005]

According to the present invention, there is provided a pedal position detecting apparatus for outputting a signal corresponding to an amount of depression of a pedal, and a predetermined operation in a state where the pedal is not depressed. If the vehicle is in a stopped state at the time when the operation is performed, an initial value setting means for setting an output value of the stroke sensor at that time as an initial value for detecting a pedal depression amount is provided.

According to this configuration, if the vehicle is in a stopped state when a predetermined operation is performed while the pedal is not depressed, the output value of the stroke sensor at that time is set as an initial value for detecting the pedal depression amount. . Therefore, even if the output value of the stroke sensor changes due to temperature change, vehicle vibration, aging, etc., it is updated to the current value every time a predetermined operation is performed, so that it is erroneous to determine whether or not the pedal is depressed. Does not occur. The read output value of the stroke sensor may be set as it is as an initial value, or a certain width may be provided and the range may be set as an initial value.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a pedal position detecting device according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of a pedal position detecting device according to the present invention. In this embodiment, it is assumed that the pedal position detecting device is applied to a slope start assist device, and a position detection target is a clutch pedal. The hill start assist device 1 includes a clutch stroke sensor (potentiometer) 2, a switch 3, a braking force holding unit 4, a buzzer 5, a set switch 6,
It has a memory 7 and a CPU 8 and has a function of correcting erroneous detection of the potentiometer 2 in detecting the position of the clutch pedal 10.

[0008] The clutch stroke sensor 2 outputs a signal of a voltage value corresponding to the amount of depression of the clutch pedal 10. The brake switch 3 detects whether or not the brake pedal 11 is depressed, and is turned on when depressed. The braking force holding means 4 includes the wheel cylinder 1
When the brake pedal 11 is released, the brake oil flows to the wheel cylinder 12 through the hydraulic passages 4a and 4b to apply braking when the brake pedal 11 is depressed. Hydraulic path 4b
, The brake oil from the wheel cylinder 12 is caused to flow backward to release the braking force. When the braking force is held when the vehicle is stopped, the solenoid valve 4d on the hydraulic path 4b is closed by the command from the CPU 8 while the brake pedal is being depressed to prevent the backflow. Brake pedal 11 with braking force held
Is increased, the hydraulic pressure is transmitted to the wheel cylinder 12 via the check valve 4c.

The CPU 8 includes a clutch stroke sensor 2
Besides, a main switch 15, an ignition switch 16, an engine rotation sensor 17, a speed sensor 18,
It is connected to the parking sensor 19, the neutral switch 20, and the like, and controls the braking force holding means 4 according to the setting state of these various switches and the output state of the various sensors.

For example, when a vehicle stops on an uphill road or the like,
When the brake pedal 11 has been depressed for a predetermined time or more and the speed sensor 18 detects zero vehicle speed, the CPU 8 controls the braking force holding means 4 so as to be in a braking force holding state. That is, control is performed to close the solenoid valve 4d so that the brake oil flowing into the wheel cylinder 12 does not flow backward when the brake pedal 11 is depressed.

At the time of starting, when the neutral switch 20 detects that the gear of the transmission has been operated to a position other than neutral, and when the clutch stroke sensor 2 detects that the clutch pedal 10 has been returned, the braking force is applied. The braking force holding means 4 is controlled so as to be in the release state. That is, control is performed to open the electromagnetic valve 4d so that the brake oil flowing into the wheel cylinder 12 flows backward.

When the CPU 8 detects that the set switch 6 is turned on while the clutch pedal 10 is not depressed, the CPU 8 reads the output voltage of the clutch stroke sensor 2 and further detects the vehicle speed zero by the speed sensor 18. , Current clutch stroke sensor 2
Is written to the EEPROM 7 as an initial value.
When the writing to the EEPROM 7 is completed,
The buzzer 5 is sounded (for example, one sound "Pe") to notify the worker that the setting of the initial value is completed. On the other hand, if the vehicle speed is not zero because the vehicle vibrates when the set switch 6 is turned on, the buzzer 5 is sounded with a different buzzer sound from the above case (for example, two beeps ("pippi")) and the worker is initialized. Is not established. When setting the initial value, the clutch pedal 10 must be in the non-depressed state.
Is operated, the set switch 6 is operated after confirming that the clutch pedal 10 is not depressed.

Next, an initial value setting process of the clutch stroke sensor 2 will be described with reference to a flowchart shown in FIG. First, at step S10, it is determined whether or not the set switch 6 has been turned on. When it is determined that the set switch 6 has been turned on, the output voltage of the clutch stroke sensor 2 is read at step S12. If it is determined that the set switch 6 has not been turned on, the process of step S10 is repeated until the set switch 6 is turned on.

After reading the output voltage of the clutch stroke sensor 2 in step S12, the output of the speed sensor 18 is read in step S14 to determine whether or not the vehicle speed is zero. If it is determined in this determination that the vehicle speed is zero, the process proceeds to step S16, and the process proceeds to step S1.
Then, the output voltage of the clutch stroke sensor 2 read in step 2 is written to the EEPROM 7 as an initial value. After writing the output voltage of the clutch stroke sensor 2, the buzzer 5 is sounded ("P") in step S18 to notify that the initial value setting is completed. On the other hand, if it is determined in step S14 that the vehicle speed is not zero, the process proceeds to step S20, in which the initial value setting is not performed, and the buzzer 5 is sounded ("pippy") to notify that the initial value setting is not successful. If the vehicle body vibrates during the initial value setting, the output voltage of the clutch stroke sensor 2 changes,
If an initial value is set with that value, an erroneous determination is made. However, in the present invention, when the vehicle body vibrates, a vehicle speed signal appears and the initial value is not set.

As described above, in this embodiment, when the set switch 6 is operated, the output value of the clutch stroke sensor 2 is read, and if the vehicle is stopped at that time, the output value of the clutch stroke sensor 2 is read. Set as the initial value of clutch pedal depression amount detection.

In the above embodiment, the output voltage of the clutch stroke sensor 2 is used as an initial value for the EEPROM.
7 is written in the EEPROM 7 as an initial value in a range where a voltage (± α) having a certain width with respect to the output voltage of the clutch stroke sensor 2 is written. It can respond to changes and aging.

In the above embodiment, the case where the pedal position detecting device is applied to the clutch pedal of the slope start assist device has been described. However, the present invention is not limited to such a case. Needless to say, the present invention can be applied to a brake system, a traction control brake pedal, an accelerator pedal, and the like.

[0018]

As described above, according to the present invention,
If the vehicle is stopped when a predetermined operation is performed while the pedal is not depressed, the output value of the stroke sensor at that time is set as the initial value of the pedal depression amount detection. , Vehicle vibration,
Even if the value changes due to aging or the like, an accurate value at the present time can be obtained, so that it is possible to prevent an erroneous determination of pedal depression / non-depression.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a pedal position detecting device according to the present invention.

FIG. 2 is a flowchart showing an initial value setting process of the clutch stroke sensor of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slope start assistance device 2 Clutch stroke sensor 3 Brake switch 4 Braking force holding means 5 Buzzer 6 Set switch 7 EEPROM 8 CPU 10 Clutch pedal 18 Speed sensor

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[Procedure amendment]

[Submission date] January 13, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

Claims (2)

[Claims] 1. A stroke sensor 2 for outputting a signal corresponding to a depression amount of a pedal 10, and a stroke sensor at a time when a vehicle is stopped when a predetermined operation is performed while the pedal 10 is not depressed. 2. A pedal position detecting device, comprising: an initial value setting means 8 for setting the output value of No. 2 as an initial value of pedal depression amount detection. 2. The pedal position according to claim 1, wherein the initial value setting means sets a range having a certain width to the read output value of the stroke sensor as an initial value. Detection device.