JPH08230629A - Sloping road start assisting device - Google Patents

Abstract

PURPOSE: To give an alarm only at necessary time by actuating an alarm means when continuous actuating time of a stopping holding means passes by prescribed time, and controlling the alarm means in an unoperated condition on condition that either one operation of a brake pedal and a clutch pedal is detected. CONSTITUTION: A solenoid valve (a stop holding means) 35 is interposed in a liquid passage 10 between a master cylinder 32 and a wheel cylinder 20. This solenoid valve 35 has a solenoid coil and a movable iron core to open and close a valve, and holds and releases a brake pressure liquid in the wheel cylinder 20 by opening and closing the valve by an indication signal from a control part 4. The control part 4 controls an alarm device 39 in an unoperated condition when the solenoid valve 35 is actuated and brake pressure in the wheel cylinder 20 is put in a sealed condition. When either one of a brake pedal 30 or a clutch pedal is stepped, the alarm device 39 is controlled in an unoperated condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle braking system,
In particular, the present invention relates to a slope start assist device that assists in maintaining a stopped state when a vehicle stops.

[0002]

2. Description of the Related Art Conventionally, as a hill start assisting device for automatically holding a brake when the vehicle is stopped to prevent the vehicle from moving backward, a detecting device for detecting the stop of the vehicle is provided. As a result, various types have been proposed in which the brake fluid pressure is held only when the stop of the vehicle is detected.

Such a type operates so as to maintain the brake fluid pressure for a long time unless the driver performs a starting operation or an automatic brake releasing operation. By the way, since the brake fluid pressure system has an extremely large number of sliding parts, a minute fluid leak occurs, and the possibility is high especially inside the solenoid valve having a complicated structure. This does not affect safety as long as a general brake operation is performed, but as mentioned above, even if it is a minute leak, it causes a decrease in hydraulic pressure with respect to pressurization for a long time, Eventually, the vehicle may not be able to be stopped.

In order to prevent such inconvenience, for example, when the braking force holding time by the electromagnetic valve for holding the braking force exceeds a set value, an alarm is issued to give the driver an additional brake pedal or a parking brake. There are things that encourage use.

[0005]

However, the above-mentioned conventional device has the following problems because the alarm device is forcibly operated when the operation of the solenoid valve elapses for a certain period of time.

That is, even when the driver operates the brake or the clutch, the alarm device is activated.
If you are operating the brake or clutch like this,
There is no need to give a warning because the driver intends to stop or start. Further, if the driver is operating the brakes and clutches, even if the vehicle starts moving, it is possible to take immediate safety measures, and it is not necessary to activate the alarm device.

It is troublesome for the driver to operate the alarm device when there is no need as described above, and it is preferable for the driver to give an alarm only when a true warning is required. It is more effective without getting used to.

Further, in the above-described conventional hill start assisting device, until the alarm device is activated after a certain period of time,
There is also a problem in that the driver does not recognize that the solenoid valve for holding the brake is operating, resulting in a lack of safety.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an apparatus for issuing an alarm only when necessary, in a device for issuing an alarm when holding a brake while a vehicle is stopped for a predetermined time. Is a technical issue.

Another object of the present invention is to provide a hill-start assisting device that allows the driver to automatically recognize that the braking force is being maintained.

[0011]

In order to solve the above technical problems, the present invention has the following constitution. That is, stop holding means for holding the brake pressure in the brake mechanism to hold the stopped state of the vehicle, brake detecting means for detecting the operating state of the brake pedal, clutch detecting means for detecting the operating state of the clutch pedal, and driving An alarm means for issuing an alarm to a person, a stop holding means, a brake detecting means, a clutch detecting means, and a control section connected to the alarm means are provided.

The control section activates the alarm means when the continuous operation time of the stop holding means has passed a predetermined time, and detects the operation of at least one of the brake pedal and the clutch pedal. The alarm means is controlled to be inactive under the condition that it is present.

Further, when a gear detecting means for detecting whether or not a transmission gear is connected is added to the above-mentioned structure, the control section causes the alarm when the continuous operation time of the stop holding means has passed a predetermined time. The alarm means on condition that at least one of the operation of the brake pedal and the engagement of the gear while the clutch pedal is operating is detected. Can be configured to control the inactive state.

Further, the control section is configured to activate the alarm means when the stop holding means is activated for a predetermined time continuously from the time when the brake pedal and the clutch pedal are inoperative. You can also

Further, there is provided a display means which is connected to the control portion and which displays an operating state of the stop holding means,
The control unit may be configured to activate the display unit when the stop holding unit is activated.

The control unit includes a central processing unit (CPU),
A read / write memory (RAM), a read-only memory (ROM), an input / output device (I / O), and a bus connecting them may be provided. A timer mechanism is provided in the control unit.

The stop holding means may be configured to hold the vehicle stopped state by detecting the vehicle stopped state and holding the brake pressure in the brake mechanism. Here, the brake mechanism can be configured by a wheel cylinder or a brake caliper.
The brake mechanism can be configured to operate by hydraulic pressure, pneumatic pressure, or the like. Further, the stop holding means is configured to detect the stopped state of the vehicle by the vehicle movement detection means for detecting the moving state of the vehicle. As the vehicle movement detecting means, for example, a speed sensor can be used, and an electromagnetic pickup type speed sensor can be exemplified.

The clutch detecting means can be exemplified by a mechanical contact type switch which outputs a signal when the clutch pedal is actuated. The brake sensor can be exemplified by a mechanical contact switch that outputs a signal when the brake pedal is operated.

The warning means can be exemplified by a device which gives a warning to the driver by visual display or voice display. For example, the alarm means can operate the buzzer or the lamp continuously, or intermittently or randomly.

As the display means, like the alarm means, a device for recognizing that the stop holding means is in operation by visual display or voice display using a buzzer or a lamp can be exemplified. it can.

When the alarm means and the display means are provided side by side, it is necessary to change the display method of both. For example, the display means outputs an intermittent buzzer sound, and the alarm means outputs a continuous buzzer sound. Alternatively, a lamp is used as the display means and a buzzer is used as the alarm means.

Further, the gear detecting means can be exemplified by a switch which outputs an actuation signal when the shift lever selects one of the gears (other than the neutral position).

[0023]

In the state where the brake pressure in the brake mechanism is confined by the stop and hold means to assist in holding the stopped state of the vehicle, when the continuous operation time of the stop and hold means has passed a predetermined time, the control section gives an alarm. Activate the means.

Further, the control section deactivates the alarm means when the operation of at least one of the brake pedal and the clutch pedal is detected even when the stop holding means is continuously operated for a predetermined time. To control.

Further, in the case where the gear detecting means is provided, the control section is at least one of that the brake pedal is operating and that the gear is connected while the clutch pedal is operating. It is also possible to control the alarm means to the inactive state on the condition that the above is detected.

Further, when the stop holding means is operated continuously for a predetermined time from the time when the brake pedal and the clutch pedal are inoperative,
It is also possible to activate the alarm means.

Further, the control section operates the display section when the stop-holding means is in operation, so that the driver recognizes the operating state of the stop-holding means.

[0028]

【Example】

<First Embodiment> A first embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, the slope starting assist device of this embodiment has a master cylinder 32 that pushes out brake pressure liquid when the brake pedal 30 is depressed. Also,
It has a wheel cylinder 20 that brakes the wheels with hydraulic pressure from the master cylinder 32.

Master cylinder 32 and wheel cylinder 2
A solenoid valve (stop-holding means) 35 is provided on the liquid path 10 between 0 and 0.
Is interposed. This solenoid valve 35 has a solenoid coil and a movable iron core that opens and closes the valve, and in response to an instruction signal from the control unit 4, the valve is opened and closed to hold the brake pressure liquid in the wheel cylinder 20. It is to be released.

That is, when the vehicle is stopped by depressing the brake pedal 30, the brake fluid pressure is maintained and the braking force is maintained even if the foot is released from the brake pedal 30.
Further, the solenoid valve 35 is provided with a check valve to allow the transmission of pressure from the master cylinder 32 side to the wheel cylinder 20 side. Therefore, when the driver repressurizes the brake pedal, the pressure is supplied from the master cylinder 32 side to the wheel cylinder 20 side through the check valve.

Vehicle wheels are provided with vehicle movement detecting means 2 for detecting the movement state of the vehicle. This can also be used as a speedometer sensor. The output of the vehicle movement detecting means 2 is input to the control section 4. The control unit 4 is composed of a microcomputer (ECU), and is composed of a memory, I / O, etc. (not shown).

A display lamp 37 is connected to the control unit 4, and when the solenoid valve 35 is operated, the lamp is turned on so that the driver can recognize that the automatic brake holding device is operating. It has become.

Further, in the control section 4, an alarm device 39 as an alarm means for giving an alarm to the driver by a visual display and an audio display, a brake sensor 11, a parking brake sensor 12, a clutch sensor 13, a power source 40 and the like. It is connected.

The alarm device 39 continuously operates the lamp and the buzzer in response to a signal from the controller 4. The brake sensor 11 is a mechanical contact switch that outputs an operation signal to the control unit 4 by operating (depressing) the brake pedal 30.

The parking brake sensor 12 is composed of a piezoelectric element, and detects the pulling force of the wire connecting the parking lever of the parking brake and the brake operating portion. Then, when the parking brake sensor 12 detects that a sufficient braking force is applied to the parking brake, the control unit 4 is configured to release the electromagnetic valve 35.

The clutch sensor 13 is a mechanical contact switch that outputs an operation signal to the control section 4 by operating a clutch pedal (not shown). Next, a control flow in the control unit 4 for determining whether or not to activate the alarm device 39 will be described mainly with reference to FIG.

First, in step 101, the solenoid valve 3
It is determined whether or not 5 is activated and the brake pressure in the wheel cylinder 20 is contained. The affirmative branch of step 101 proceeds to step 102, and the negative branch of step 101 is the inoperative mode of the alarm device 39 at step 105. In step 102, it is determined whether or not the brake pedal 30 is depressed, the negative branch moves to step 103, the positive branch moves to step 105, and the alarm device 39
It becomes the non-operation mode of.

Then, in step 103, it is judged whether or not the clutch pedal is depressed, the negative branch outputs an operation signal to the alarm device 39 in step 104 to operate the alarm device 39, and the positive branch outputs the step. At 105, a non-operation mode is set.

As described above, in this embodiment, when at least one of the brake pedal 30 and the clutch pedal is in operation, the alarm device 39 is not operated even if the solenoid valve 35 is continuously operated for a predetermined time. is there.

<Second Embodiment> A second embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 3, this embodiment includes gear detection means (gear sensor) 15 for detecting whether or not the transmission gear is connected. Since the other configurations are the same as those in the first embodiment, the description thereof will be omitted.

The gear sensor 15 outputs an operation signal when the shift lever selects any gear position. The gear sensor 15 may be configured to output a signal when the shift lever moves away from the neutral position.

Next, the control flow for determining whether or not to activate the alarm device 39 in the control unit 4 of the present embodiment will be described mainly with reference to FIG. First, in step 201,
It is determined whether or not the solenoid valve 35 is operating, the affirmative branch shifts to step 202, and the negative branch returns (the circulation routine of step 201). In step 202,
It is determined whether or not the brake pedal 30 is depressed,
The negative branch proceeds to step 203, and the positive branch is a circulation routine in which the alarm device 39 is not activated. In step 203, it is judged whether or not the gear is engaged with the clutch pedal being depressed, the negative branch moves to step 204, and the positive branch becomes a circulation routine which does not activate the alarm device 39.

Next, in step 204, step 20
It is determined whether or not a certain time has elapsed after shifting to step 4, the positive branch activates the alarm device 39 in step 205 and then returns to step 201, and the negative branch is a circulation routine that does not activate the alarm device 39. .

As described above, in this embodiment, the alarm device 39 is activated when a certain period of time elapses after neither the brake pedal 30 nor the clutch pedal is depressed. That is, the alarm device 39 is not activated when at least one of the fact that the brake pedal 30 is activated and the gear is connected while the clutch pedal is activated is detected.

Even when the alarm device 39 is operating, the alarm device 39 will be stopped if the brake pedal 30 or the clutch pedal is operated.

[0047]

According to the present invention, in a device for issuing an alarm when holding a brake while a vehicle is stopped for a predetermined time,
Even when the stop / hold means is continuously operated for a predetermined time, when the operation of at least one of the brake pedal and the clutch pedal is detected, the alarm means is controlled to be in the inoperative state. Therefore, it is possible to provide a slope start assist device that issues an alarm only when necessary.

The alarm means may be operated under the condition that at least one of the fact that the brake pedal is operating and the gear is connected while the clutch pedal is operating is detected. By controlling to the inoperative state, the warning means can be controlled after more accurately determining the driver's willingness to start, and the frequency of occurrence of the warning means when unnecessary can be reduced.

Further, since the alarm means is activated when the stop holding means is continuously operated for a predetermined time from the time when the brake pedal and the clutch pedal are inoperative, it is truly necessary. In this case, the alarm means can be operated reliably.

Further, by providing the display means for displaying the operating state of the stop holding means, it becomes possible for the driver to automatically recognize that the braking force is being held.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a control flow in the control unit of the first embodiment for determining whether to activate the alarm device.

FIG. 3 is a configuration diagram showing a second embodiment of the present invention.

FIG. 4 is a control flow for determining whether or not to activate the alarm device in the control unit of the second embodiment.

[Explanation of symbols]

 2 ... Vehicle movement detection means 4 ... Control part 10 ... Liquid path 11 ... Brake sensor (brake detection means) 12 ... Parking brake sensor 13 ... Clutch sensor (clutch detection means) 15 ... Gear sensor (gear detection Means) 20 .. Wheel cylinder 30 .. Brake pedal 32 .. Master cylinder 35 .. Solenoid valve (stop holding means) 37. Indicator lamp (display means) 39. Alarm device (alarm means) 40.

Claims (4)

[Claims] 1. A stop holding means for holding a brake pressure in a brake mechanism to hold a stopped state of a vehicle, a brake detecting means for detecting an operating state of a brake pedal, and a clutch detecting means for detecting an operating state of a clutch pedal. When,
The driver is provided with an alarm means for issuing an alarm, and a stop holding means, a brake detecting means, a clutch detecting means, and a controller connected to the alarm means, wherein the controller is a continuous operating time of the stop holding means for a predetermined time. The alarm means is activated when a predetermined time has passed, and the alarm means is controlled to be in an inactive state on condition that the operation of at least one of the brake pedal and the clutch pedal is detected. Slope start assist device. 2. A stop holding means for holding a brake pressure in a brake mechanism to hold a stopped state of a vehicle, a brake detecting means for detecting an operating state of a brake pedal, and a clutch detecting means for detecting an operating state of a clutch pedal. When,
Gear detection means for detecting whether the gear of the transmission is connected, alarm means for issuing a warning to the driver, and a control section connected to each of these means, the control section, of the stop holding means At least one of operating the alarm means when a predetermined operating time has elapsed, operating the brake pedal, and connecting a gear while the clutch pedal is operating. The slope starting assist device is characterized in that the alarm means is controlled to an inactive state on the condition that the above condition is detected. 3. The control unit activates the alarm means when the stop / hold means operates continuously for a predetermined time from the time when the brake pedal and the clutch pedal are inoperative. Claim 1 or 2
Slope start assist device described in. 4. The display unit is connected to the control unit and displays an operating state of the stop and hold unit, and the control unit operates the display unit when the stop and hold unit is operating. The slope starting assistance device according to any one of claims 1 to 3.