JPH07101324A - Slop road starting assist device - Google Patents

Abstract

PURPOSE:To display a number of an inferior sensor when its inferiority is detected as a result of testing each sensor part. CONSTITUTION:A device comprises a brake sensor 2, clutch sensor 3, clutch stroke sensor 4, rotational sensor 5, neutral switch 6 for showing neutral of a speed change lever and a slope sensor 7, and further the device comprises a control valve 9 for holding a brake pressure in accordance with a control signal even when released a brake pedal 11, program control circuit 10 for feeding the control signal by inputting an output of each sensor and a display operating board provided in a driver's seat to display a display output by giving an operating input to the program control circuit In one or more of the sensors, abnormality for whether provided or not is detected, and a sensor number, detecting the abnormality, is displayed in the display operaing panel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used by being installed in an automobile. The present invention relates to a driving assistance device. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer-aided driving assistance device that assists a brake pressure release operation when a vehicle starts from a stopped state.

[0002] The present invention is applied to an automobile in which a driver operates a clutch and a transmission gear with a clutch pedal and a select lever. It does not apply to so-called automatic vehicles that are operated manually.

[0003]

2. Description of the Related Art When a vehicle stopped on a slope road is started, the driver temporarily applies a braking force to the vehicle to apply a braking force to the vehicle, selects a shift gear as a start gear, and slowly engages the clutch to accelerate. It is necessary to depress the pedal to increase the output of the engine and to perform a complicated operation of loosening the parking brake. Although such an operation is a basic item for driving an automobile, the operation of a truck, a bus, or the like is greatly different depending on the load, and the engine is apt to stall or reverse.

As a device for assisting such a driving operation, there is known a slope starting assist device disclosed in JP-A-60-11719 or JP-A-4-244462.

In the conventional hill start assisting device, when the brake pressure exceeds a certain value and the vehicle speed becomes zero, that is, when the vehicle stops after passing a running state (the vehicle may have a gradient in the running direction). If detected, the driver brakes
The brake pressure is automatically maintained even when the foot is released from the pedal. In this state, when the driver selects the select lever to the starting position, engages the clutch, and depresses the accelerator pedal, the device automatically detects it, and automatically at the most appropriate timing. It is configured to release brake pressure. In a vehicle equipped with such a slope start assist device, the driver can perform a slope start operation without operating the parking brake.

Even if there is no gradient in the traveling direction of the vehicle, if the brake pressure is maintained when the vehicle is stopped from the traveling state, the brake pressure is automatically maintained even when the vehicle is stopped such as waiting for a signal. Sometimes it's convenient, and it's used for that.

[0007] The hill start assisting device that is practically used is
After the brake pressure is automatically maintained, the parking
When the brake is applied, the brake pressure is automatically released. That is, when the driving operation is completed and the vehicle is stopped, the temporary holding state of the brake pressure is released so that the temporary holding state of the brake pressure is not used in place of the parking brake. In addition, when the driver tries to leave the seat while the brake pressure is automatically maintained, a safety device such as issuing a large alarm is added.

[0008]

In such a slope start assisting device, the sensor input is very important, and a defective sensor component causes a malfunction. Although the reliability of each component is secured, the occurrence of defects is unavoidable as long as it is a component.

The present invention has been made against such a background. When a test is performed on each sensor component and a defect is detected as a result of the test, the driver is given the number of the defective sensor. It is an object of the present invention to provide a slope start assist device that can be displayed. An object of the present invention is to improve the safety of a slope start assist device.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a hill start assisting device capable of displaying an abnormality sensor number, which is a brake sensor, a clutch sensor, a rotation sensor, and a shift lever neutral. , A control valve that holds a brake pressure according to a control signal even when the brake pedal is released, and a program control that outputs the control signal by using the output of each sensor as an input. In a hill start assist device including a circuit and a display operation panel that is provided in the driver's seat to give an operation input to the program control circuit to display an output, the control circuit detects an abnormality of the sensor and detects an abnormality. Is provided with a failure display means for displaying the number of the sensor for which is detected on the operation panel.

It is preferable that the control circuit includes means for setting a diagnosis mode for executing the failure display means by an operation input from the display operation panel.

[0012]

The program control circuit executes a test as to whether or not each sensor has an abnormality according to an operation input or a condition set in the program.
As a result of this test, the number of the sensor in which the abnormality is detected is displayed on the operation display panel of the driver's seat. From this number display, the driver can be informed of an abnormal sensor occurrence and can take appropriate measures.

The display can be done automatically. In addition, it is convenient to be able to set a diagnosis mode in which the failure display means is executed by operating the operation display panel so that the failure location can be displayed by the intention of the driver or service person. It is preferable that the program control circuit is set so that the operation for this purpose is a simultaneous operation by a combination of a plurality of operation switches. Since such a diagnostic mode setting operation is an operation that is rarely performed, it is not appropriate to add an additional operation switch, and in the case of simultaneous operation by combining a plurality of operation switches, the number of operation switches is increased. Because there is no need.

Any method may be used for detecting the failure of the sensor. One example is to hold a table in which the effective range of each sensor is recorded in advance.
This is a method of referring to this table for the taken sensor output and determining whether or not the output value is within the recorded effective range, and determining that the sensor is abnormal when the sensor output is outside the effective range.

[0015]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention.

In the embodiment of the present invention, the clutch hydraulic switch 1 is used.
A brake sensor 2, a clutch sensor 3, a clutch stroke sensor 4, a rotation sensor 5, a neutral switch 6 indicating the neutral position of a shift lever, and a gradient sensor 7, and a brake pedal 11 Is provided with a control valve 9 that holds the brake pressure according to the control signal, and a program control circuit 10 that outputs the control signal by using the output of each sensor as an input. When the output of the sensor 2 indicates a braking state and the vehicle speed is zero, first control means for sending a control signal for maintaining the brake pressure to the control valve 9, and the brake pressure is controlled by the first control means. When the clutch sensor 3 detects a predetermined stroke while indicating the forward start position or the reverse position in the held state, A second control means for transmitting a control signal for releasing the brake pressure, and a display operation panel provided in the driver's seat for giving an operation input to the program control circuit 10 to display a display output. The control circuit 10 detects the presence / absence of abnormality in one or more of the above-mentioned sensors and a table 10a in which the effective range of each value of the input sensor is recorded for each sensor, and indicates the number of the sensor in which the abnormality is detected. A failure display means for displaying on the display operation panel, and a means for setting a diagnosis mode for executing the failure display means by an operation input from the display operation panel are included.

The display operation panel is located at a position where the driver can operate while driving.
0 is provided, and a main switch 21, a 7-segment display 22, a release adjustment switch 23, and an initial adjustment switch 24 are arranged. The main switch 21 opens and closes the power supply to this device, and in this example, if the switch knob is raised, it is closed to drive the device, and if it is lowered, it is stopped. The 7-segment display 22 is a 7-segment numeral display with a decimal point 26, and a numeral is displayed during the adjustment process.

Further, an alarm device 25 for issuing an alarm by an alarm output from the program control circuit 10 is provided, and the alarm device 25 is provided with an alarm buzzer 2 for audibly issuing an alarm.
5a and an alarm lamp 25b for emitting an alarm when turned on are provided.

Here, the adjustment setting of the brake release point when performing the hill start assisting operation will be described.

When the driver keeps pressing the initial adjustment switch 24 for several seconds, the program control circuit 10 enters the initial adjustment mode. When the driver keeps pressing the initial adjustment switch 24 and depresses the clutch pedal, when the clutch hydraulic switch 1 operates, the detection value of the clutch sensor 3 at that time is captured and stored. The driver operates the shift lever to set the shift gear. Neutral
The switch 6 detects this. In this state, the driver slowly releases the clutch pedal and releases the initial adjustment switch 24 at the optimum half-clutch position. The position of the half clutch where the hand is released is stored as the release point. An operation test is performed in this state, and the position of the release point is changed by operating the release adjustment switch 23. That is, if it is considered that the release point should be at a position where the clutch pedal is further depressed, the release adjustment switch 23 is pushed upward once. If it is considered that the release point should be at the position where the clutch pedal is returned to the released position, the release adjustment switch 23 is pushed once downward. This operation is repeated while conducting an operation test. The adjustment step from the initial value at this time is displayed on the 7-segment display 22. When the adjustment step is downward (minus direction), the decimal point 26 of the 7-segment display 22 is lit.

The program control circuit 10 receives outputs from the clutch hydraulic pressure switch, stop lamp switch, back switch, door switch, parking brake switch, key switch, etc. in addition to the outputs from the aforementioned sensors. Since these outputs are not directly related to the present invention, description and description thereof in the drawings are omitted here.

In the brake holding operation by the program control circuit 10 performed after the brake release point is adjusted in this way, the program control circuit 10 fetches the output from the brake sensor 2 as shown in the flow chart of FIG. , It is determined whether or not the preset value of the depression amount is exceeded. If it does not exceed the set value, it means that the vehicle is not stopped by braking, and therefore the sending of the control signal to the control valve 9 is prohibited and the assisting operation for starting the slope is stopped. If it exceeds the set value, the output from the rotation sensor 5 is taken in and it is determined whether or not the vehicle speed is zero. If the vehicle speed is not zero, the vehicle is running, so the sending of the control signal to the control valve 9 is prohibited and the auxiliary operation for starting the slope is stopped.

When the vehicle speed is zero, the output from the gradient sensor 7 is taken in and it is determined whether or not the current gradient exceeds the set predetermined value S. If the slope exceeds the predetermined value S, it is determined that the vehicle is on a road where the ability to start the slope is not reached, and the control signal is not sent to the control valve 9 to stop the auxiliary operation. If it does not exceed the predetermined value S, the control signal is sent to the control valve 9 assuming that the vehicle is on a road capable of starting uphill, and the control valve 9 is driven to operate the brake valve 12 to execute the auxiliary operation for starting uphill. .

Next, the brake releasing operation will be described. FIG. 3 is a flow chart showing the flow of the brake release operation of the program control circuit in the embodiment of the present invention.

The clutch sensor 3 and the neutral switch 6 when the vehicle is in the brake holding state on a slope.
It is determined whether the gear is set to the forward start position (low or second) or the reverse position by taking in the output from the clutch.

When the clutch is stepped on and the gear is set to the starting state, it is determined from the output of the clutch sensor 3 whether or not the stroke is equal to or less than a predetermined stroke. When the stroke is equal to or less than the predetermined stroke, it is assumed that the vehicle is started, and the sending of the control signal to the control valve 9 is prohibited and the brake is released. When the gear is not set to the start state or the amount of depression of the clutch is equal to or greater than the predetermined stroke, the control signal is continuously sent to the control valve 9 to maintain the brake holding state.

Initial setting of the clutch and the brake can be arbitrarily performed by adapting to the preference of the driver or a change due to wear of the brake and the clutch. The set stroke values of the clutch pedal and the brake pedal 11 are held until they are reset. If each stepping stroke does not exceed the set reference value, the program control circuit 10 prohibits the sending of a control signal to the control valve 9 to stop the starting assist operation, and each stepping stroke is set. If it exceeds the reference value, the start assist operation is continued. When the main switch 21 is turned off, the power supply to the device is stopped and the starting assist operation is not performed.

The number display operation of the abnormality sensor, which is a feature of the present invention, will be described. FIG. 4 is a flow chart showing the flow of the abnormal sensor number display operation performed by the program control circuit in the embodiment of the present invention, and FIG. 5 shows the effective range (normal range) for the input from the clutch stroke sensor in the embodiment of the present invention. It is a figure which shows an example.

In the above-described slope starting assist operation, the program control circuit 10 includes the release adjustment switch 23 and the initial adjustment switch 2 provided in the control unit 20.
The diagnosis mode is set according to the operation input by the combination of 4 or according to the condition set in the program, and the output from each switch or each sensor is taken in and the test as to whether or not there is an abnormality is sequentially executed.

Each switch or each sensor includes a clutch hydraulic pressure switch 1, a brake sensor 2, a clutch sensor 3, a clutch stroke sensor 4, a rotation sensor 5, a neutral switch 6, a gradient sensor 7, and a stop.・ There are lamp switches, back switches, parking brake switches, key switches, etc. The number of the switch or sensor in which the abnormality is detected as a result of these tests is displayed on the 7-segment display 22.

To determine the output value from each sensor, refer to the table 10a in which the effective range is recorded in advance,
It is performed depending on whether the input value is within the valid range.
When it is determined that the sensor number is out of the valid range, the sensor number is displayed on the 7-segment display 22. Taking the output from the clutch stroke sensor 4 shown in FIG. 5 as an example, the electrical angle is 90 degrees, so if this is mounted so that it operates only in the range of 10 degrees to 80 degrees,
Its normal input value is limited to 0.5V-4.5V,
When the input value is 0V to 0.4V, it is determined that the wire is broken, and when the input value is 4.6V to 5V, it is the short circuit.

The conversion of the analog value into the digital value in the setting of the upper limit and the lower limit for the pass / fail judgment is as follows.
Taking the case of the clutch stroke sensor 4 described above as an example, the analog value of 0V to 5V is 0% to 100%.
Is converted into a digital value indicated by, and 10% to 90% is recorded in the table 10a as a normal range. Similarly for the analog value from each other sensor, the maximum value of its output is 100
The value is digitally converted as%, the upper limit and the lower limit are set by the digitally converted value, recorded in the table 10a, and the judgment is made based on the value.

In this way, the effective range of each sensor is held in advance in the table 10a provided in the program control circuit 10, and the output of each sensor output that has been fetched is referred to by referring to the table 10a. It is determined whether the value is within the valid range recorded, and if the sensor output is outside the valid range, the sensor number is displayed as being abnormal and the switch or sensor in which the abnormality has occurred is displayed. It is possible to make the driver recognize which is which.

[0034]

As described above, according to the present invention, the test of each sensor component is executed during the hill start assisting operation, and when a defect is detected as a result of the test, the number of the defective sensor is detected. Can be displayed on the display operation panel, and this display has the effect of facilitating failure diagnosis and improving safety.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing a flow of a brake holding operation of a program control circuit in the embodiment of the present invention.

FIG. 3 is a flowchart showing a flow of a brake release operation of the program control circuit in the embodiment of the present invention.

FIG. 4 is a flowchart showing the flow of an abnormal sensor number display operation performed by the program control circuit in the embodiment of the present invention.

FIG. 5 is a diagram showing a clutch stroke according to an embodiment of the present invention.
The figure which shows the example of the effective range about the input from a sensor.

[Explanation of symbols]

 1 Clutch hydraulic switch 2 Brake sensor 3 Clutch sensor 4 Clutch stroke sensor 5 Rotation sensor 6 Neutral switch 7 Gradient sensor 9 Control valve 10 Program control circuit 10a Table 11 Brake pedal 12 Brake valve 20 Control unit 21 Main switch 22 7-segment display 23 Release adjustment switch 24 Initial adjustment switch 25 Alarm device 25a Alarm buzzer 25b Alarm lamp 26 Decimal point

Claims (2)

[Claims] 1. A brake sensor, a clutch sensor, a rotation sensor, a neutral switch indicating a neutral position of a shift lever, and a gradient sensor, the brake pressure according to a control signal even when the brake pedal is released. A control valve for holding, a program control circuit for sending the control signal by using the output of each sensor as an input, and a display operation panel provided in the driver's seat for giving an operation input to the program control circuit and displaying a display output. In the slope starting assistance device, the control circuit includes failure display means for detecting the presence or absence of abnormality of the sensor and displaying the number of the sensor in which abnormality is detected on the operation panel. Auxiliary device. 2. The slope start assist device according to claim 1, wherein the control circuit includes means for setting a diagnosis mode for executing the failure display means by an operation input from the display operation panel.