JP2000297666A - Vehicle brake state control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle brake state control device capable of suppressing decline in battery voltage, even in a vehicle provided with both an idling stop device and a brake force maintaining device. SOLUTION: A vehicle brake state control device is provided with a brake force maintaining means 2 for controlling the maintaining of brake force, when a vehicle is stopped and idling stop means for stopping an engine for a prescribed amount of time, while the vehicle is stopped. When a parking brake is activated in a state in which the engine speed is below a constant value, a gear is in a neutral position, and a clutch pedal is not depressed is detected with various types of sensors, when it is determined by vehicle stop determination means that the vehicle is stopped, idling stop means stops the engine and brake force holding means 2 releases the maintained brake force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle braking state control device provided with a braking force holding device for controlling holding of a braking force when the vehicle stops and an idling stop device for stopping idling at a predetermined time when the vehicle stops.

[0002]

2. Description of the Related Art Conventionally, large vehicles such as buses and trucks have an idling stop device for stopping idling (that is, stopping the engine) when the vehicle is temporarily stopped at a signal or a railroad crossing. For the purpose of reducing the load on the driver, there is a braking force holding device that operates so as to hold the braking force when the vehicle stops and release the holding of the braking force in synchronization with the clutch operation of the driver. FIG. 4 is a diagram showing idling stop conditions and release conditions of the conventional idling stop device. When the condition (A) shown in this figure is satisfied, idling is stopped (that is, the engine is stopped), and when the condition (B) is satisfied, idling stop is released (that is, the engine is restarted). (A) Idling stop operation start (engine stop) conditions-Vehicle stop (vehicle speed = 0 km / h)-Engine speed is below a certain value-Gear position is neutral-Crutch pedal is released (B) Idling stop release (engine restart) Conditions-Engine stopped-Gear position is neutral-Depressing clutch pedal

The braking force holding device controls a solenoid valve for braking provided between a master cylinder and a wheel cylinder associated with a brake pedal when the vehicle is stopped, and holds the braking force. The braking force is released when the clutch position passes a preset meet point in the process of returning the clutch pedal when the driver starts. With this braking force holding device, even when the driver releases his / her foot from the brake pedal when starting on a slope, the vehicle does not start moving, so that a smooth start can be achieved. When the braking force holding system is activated (that is, when the braking force is held), the system is not released even if the engine is stopped.

FIG. 5 is a diagram showing a braking force holding start condition and a release condition of a conventional braking force holding device. When the condition (C) shown in this figure is satisfied, the braking force holding operation is started, and when the condition (D) is satisfied, the braking force holding is released. (C) Start condition of braking force holding operation-Vehicle stopped (vehicle speed = 0 km / h)-Engine rotation-Ignition on-Do not apply parking brake-Depress brake pedal (D) Release of holding braking force-Gear position other than neutral・ Step on the clutch pedal ・ Pull the parking brake or turn off the ignition.
There is one disclosed in US Pat.

[0005]

In the case of a vehicle provided with the above-mentioned conventional idling stop device and braking force holding device, there are the following problems. That is, after the vehicle is stopped under the braking force holding operation start condition, if the idling stop operation start (engine stop) condition is satisfied and the engine is stopped, charging of the battery is not performed. Will continue to operate (i.e., the solenoid valve will remain activated), and if this state continues for a long time, the battery will be in a state of rising (i.e., the battery voltage will decrease). ), There is a problem that the engine may not be started even if the idling stop release condition is satisfied. Further, since a decrease in the battery voltage also results in a decrease in the holding force of the solenoid valve, there is also a problem that, for example, when the vehicle is stopped on a slope, in the worst state, the vehicle may start moving.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem, and to provide a vehicle braking state control device capable of suppressing a decrease in battery voltage even in a vehicle equipped with both an idling stop device and a braking force holding device. It is intended to provide.

[0007]

In order to achieve the above object, the present invention provides a braking force holding means for controlling holding of a braking force when a vehicle is stopped, and an idling stop means for stopping an engine at a predetermined time when the vehicle is stopped. A vehicle braking state control device comprising: an engine rotation detection sensor that detects an engine speed, a gear position sensor that detects whether a driving force can be transmitted to wheels, and a clutch connection state. A clutch pedal sensor, a parking brake sensor that detects an operating state of a parking brake, and a vehicle stop determination unit that determines whether the vehicle is stopped.When the vehicle stop determination is performed by the vehicle stop determination unit, In the detection of each of the above-mentioned sensors, the gear position neutral and the clutch pedal non-pressing force state are detected below the engine speed constant value. State, when the parking brake is actuated, the idling stop means stops the engine, the braking force retaining means is configured to release the braking force holding.

According to this structure, when the parking brake is applied, the idling stop means is activated, and the braking force holding operation of the braking force holding means is released simultaneously. It is possible to suppress a decrease in the battery voltage due to the holding device, and to avoid a state in which the engine cannot be started when the idling stop state is for a long time. In addition, since the battery voltage drop is very small, the decrease in the holding force of the solenoid valve is also very small. For example, even when the vehicle stops on a slope, a sufficient braking force can be maintained for the vehicle.

[0009] Further, the present invention provides
Braking force holding means for controlling braking force holding when the vehicle is stopped,
A vehicle braking state control device comprising: idling stop means for stopping the engine at a predetermined time when the vehicle stops.
The braking force holding means releases the braking force holding at the same time as the engine is stopped by the operation of the idling stop means during the holding of the braking force.

According to this configuration, the braking force holding operation of the braking force holding means is released at the same time as the idling stop means is operated, so that the braking force holding is released at the same time as the engine is stopped, and the battery is released as described above. Voltage drop can be minimized, and battery voltage drop can be minimized.

Here, in this vehicle braking state control device, as a combination of conditions for setting the engine to a stop state by the operation of the idling stop means, first, the vehicle stops, the engine rotates, the ignition is turned on, and the parking brake is not applied. When the brake is depressed in this state, the braking force is held by the braking force holding means. From this state, if the parking brake is applied, or the ignition is turned off, or if the gear position is other than neutral and the clutch pedal is depressed, or if the parking brake is not applied and the ignition is not applied Is on, the gear position is neutral and the idling stop means is in the idling stop state by the operation of the idling stop means, or the parking brake is not applied, the ignition is on, the gear position is other than neutral, and the clutch pedal is Is not being stepped on.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a main part of a vehicle braking state control device according to an embodiment of the present invention. FIG. 1A shows an idling stop device 1 included in the vehicle braking state control device. FIG. 1B shows a braking force holding device 2 included in the vehicle braking state control device. The idling stop device 1 includes an engine rotation sensor 10 for detecting engine rotation, a neutral switch 11 for detecting gear neutral, a parking switch 12 for detecting operation of a parking brake,
Clutch sensor 1 for detecting depression of clutch pedal
3, a speed sensor 14 for detecting a vehicle speed, an indicator lamp 15 for notifying an idling stop state, an engine stop unit 16 for stopping / restarting the engine, a warning buzzer 17 for notifying a failure of the device, And an ECU (engine control unit) 18 that receives the output of each switch and controls the engine stop 16 based on each value.

The ECU 18 stops idling when the following condition (A) is satisfied (ie, stops the engine), and releases the idling stop when the condition (B) is satisfied (ie, stops the engine). Restart). (A) Idling stop operation start (engine stop) condition-Vehicle stop (vehicle speed = 0 km / h)-Engine speed constant value or less-Gear position is neutral-Clutch pedal is released (clutch connection)-Parking brake operation (B ) Idling stop release (engine restart) condition-engine stop-gear position is neutral-depressing clutch pedal (clutch disengagement)

Here, in the conventional idling stop device, since the idling stop operation start condition does not include "parking brake operation", the idling stop and the holding of the braking force are performed simultaneously. On the other hand, in the present invention, since the idling stop operation start condition includes “parking brake operation”, the holding of the braking force is released simultaneously with the stop of the idling.

The braking force holding device 2 includes an engine rotation sensor 20 for detecting engine rotation, a neutral switch 21 for detecting gear neutral, a parking switch 22 for detecting operation of a parking brake, and depression of a clutch pedal. Clutch sensor 23 to detect
A speed sensor 24 for detecting a vehicle speed, a brake switch 25 for detecting depression of a brake pedal, a braking force holding operation lamp 26 for notifying that a braking force holding state has been established, and a device for notifying a failure of the device. The warning lamp 27 and the alarm buzzer 28, the stop / hold solenoid valves Fr29 and Rr30, the outputs of the sensors and the switches, the battery power, the ignition power, and the system power are captured. Based on these values, Control of the solenoid valves Fr29 and Rr30,
And an ECU (engine control unit) 31 for controlling the braking force holding operation lamp 26, the warning lamp 27, and the alarm buzzer 28.

The ECU 31 starts the holding of the braking force when the following condition (C) is satisfied, and releases the holding of the braking force when the condition (D) is satisfied. (C) Conditions for starting braking force holding operation ・ Vehicle stopped (vehicle speed = 0 km / h) ・ Engine rotation ・ Ignition ON ・ Parking brake inactive ・ No brake pedal depressed (clutch connected state) (D) Brake force holding release・ The gear position is other than neutral ・ Step on the clutch pedal (clutch disengagement) ・ Activate the parking brake or operate the ignition off or idling stop device 1

Here, in the conventional braking force holding device, since there is no "idling stop device operation" in the braking force release condition, the idling stop and the holding of the braking force are performed simultaneously. On the other hand, in the present invention, since the braking force release condition includes “idling stop device operation”, the holding of the braking force is released simultaneously with the stop of the idling.

Next, referring to the flowcharts shown in FIGS. 2 and 3, the idling stop device 1 and the braking force holding device 2
Will be described. (A) Operation of the idling stop device 1 FIG. 2 is a flowchart showing the idling stop operation of the idling stop device 1. First, in step S10, the ECU 18 captures the output of the speed sensor 14,
It is determined whether the vehicle is stopped. In this determination, if it is determined that the vehicle is not stopped, this step is repeated, and if it is determined that the vehicle is stopped, step S1 is performed.
Proceed to 2 to capture the output of the engine rotation sensor 10,
It is determined whether or not the engine speed is equal to or less than a certain value. In this determination, if it is determined that the engine speed is not lower than the predetermined value, the process returns to step S10, and if it is determined that the engine speed is lower than the predetermined value, the process proceeds to step S14 to take in the output of the neutral switch 11 and determine whether the gear position is neutral. Is determined.

When it is determined that the gear position is not neutral, the process returns to step S10, and when it is determined that the gear position is neutral, the process proceeds to step S16, where the output of the clutch sensor 13 is fetched and it is determined whether or not the clutch pedal is released. In this determination, when it is determined that the clutch pedal is depressed, the process returns to step S10, and when it is determined that the clutch pedal is released, the process proceeds to step S18, and the output of the parking switch 12 is taken in to determine whether the parking brake has been activated. I do. In this determination, if it is determined that the parking brake is not operated, the process returns to step S10, and if it is determined that the parking brake is operated, step S10 is performed.
Proceeding to 20, the engine stop unit 16 is controlled to stop the engine. That is, idling is stopped.

(B) Operation of the braking force holding device 2 FIG. 3 is a flowchart showing the braking force holding releasing operation of the braking force holding device 2. First, the ECU 31 determines in step S3
At 0, it is determined whether or not the ignition is off. In this determination, when it is determined that the ignition is off, in step S40, the stop holding solenoid valves Fr29, Rr
30 is controlled to release the holding of the braking force. Ignition
If it is determined that it is not off, the process proceeds to step S32, in which the output of the parking switch 22 is taken in, and it is determined whether or not the parking brake has been operated. In this determination, when it is determined that the parking brake has been operated, the process proceeds to step S40, in which the solenoid valves Fr29 and Rr30 are controlled to release the holding of the braking force.

If it is determined that the parking brake has not been actuated, the process proceeds to step S34, in which the output of the neutral switch 21 is fetched to determine whether or not the gear position is in the neutral position. In this determination, if it is determined that the gear position is neutral, step S3
Proceeding to 8, it is determined whether the idling stop device 1 has been activated. In this determination, the idling stop device 1
When it is determined that has operated, the process proceeds to step S40, in which the solenoid valves Fr29 and Rr30 are controlled to release the holding of the braking force.
When it is determined that the idling stop device 1 is not operating, the process returns to step S30. On the other hand, step S3
If it is determined in step S4 that the gear position is not neutral, the process proceeds to step S36, and the clutch sensor 23
To determine whether or not the clutch pedal is depressed. In this determination, if it is determined that the clutch pedal is depressed, the process proceeds to step S40, and the solenoid valve Fr2
9. Rr30 is controlled to release the holding of the braking force. If it is determined that the clutch pedal has not been depressed, the process proceeds to step S38, and it is determined whether the idling stop device 1 has been operated.

As described above, in this embodiment, the idling stop device 1 includes the following components: "vehicle stopped", "engine speed is below a certain value", "gear position neutral", "clutch pedal is not depressed", When the five conditions of "parking brake operation" are satisfied, idling is stopped. Therefore, when the parking brake is operated, the braking force holding operation of the braking force holding device 2 is released at the same time as the idling stop device 1 is operated, that is, the braking force holding is released simultaneously with the idling stop state. It is possible to suppress a decrease in the battery voltage except for spontaneous discharge, and to avoid a state in which the engine cannot be started when the idling stop state is for a long time.

On the other hand, the braking force holding device 2 may be provided with "ignition off", "parking brake operation", "gear position other than neutral and clutch pedal depressed", or "parking brake Not activated, ignition is on, gear position is neutral and idling stop device 1 is activated "or" Parking brake is not activated, ignition is on and gear position is other than neutral, clutch is off. The idling stop device 1 operates while the pedal is not depressed "to release the holding of the braking force. Therefore,
Since the braking force holding operation of the braking force holding device 2 is released at the same time when the idling stop device 1 is activated, that is, the braking force holding is released at the same time as the idling stop state, the battery voltage is reduced except for spontaneous discharge. Thus, it is possible to prevent the engine from being unable to start when the idling stop state is over a long time.

In the above embodiment, the idling stop device 1 operates the idling stop device 1 and the braking force holding device 2
Although the braking force holding operation is not performed at the same time, an alarm may be output when the braking force holding operation is performed for some reason. In this case, the alarm may be, for example, a buzzer, a lamp flashing, or a sound output.

[0025]

As described above, according to the present invention,
When the parking brake is activated, the braking force is released at the same time as the idling stop state, or the braking force holding device is released at the same time as the idling stop device, so that the battery voltage is suppressed except natural discharge. It is possible to avoid a state in which the engine cannot be started when the idling stop state is for a long time. Also, since the battery voltage drop caused by the idling stop device and the braking force holding device is very small, the decrease in the holding force of the solenoid valve is also very small. For example, even when the vehicle stops on a slope, the vehicle has sufficient braking force. Can be maintained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a main part of a vehicle braking state control device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of an idling stop device of the vehicle braking state control device of the embodiment.

FIG. 3 is a flowchart showing an operation of a braking force holding device of the vehicle braking state control device of the embodiment.

FIG. 4 is a diagram showing idling stop conditions and release conditions in a conventional idling stop device.

FIG. 5 is a diagram showing a braking force holding start condition and a release condition in a conventional braking force holding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Idling stop device 2 Braking force holding device 10, 20 Engine rotation sensor 11, 21 Neutral switch 12, 22 Parking switch 13, 23 Clutch sensor 14, 24 Speed sensor 15 Indicator lamp 16 Engine stop unit 18, 31 ECU 25 Brake switch 26 Braking force holding operation lamp 27 Warning lamp 17, 28 Warning buzzer 29 Solenoid valve Fr 30 Solenoid valve Rr

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02D 17/00 F02D 17/00 M Q F Term (Reference) 3D041 AA03 AA80 AB01 AC01 AC29 AD01 AD02 AD20 AD31 AD32 AD42 AD51 AE03 AE41 AF00 3D046 BB02 EE01 GG02 HH03 HH06 HH07 HH17 HH22 HH37 3G092 AC03 CA01 EA09 EA13 EA15 FA32 FA43 FB06 HE01Z HF02Z HF12Z HF13Z HF15Z HF19Z HF20Z BA21 DB12 BA26 DB12 BAH

Claims (2)

[Claims] 1. A vehicle braking state control device comprising: braking force holding means for controlling holding of braking force when the vehicle is stopped; and idling stop means for stopping the engine at a predetermined time when the vehicle is stopped. , A gear position sensor that detects whether the driving force can be transmitted to the wheels, a clutch pedal sensor that detects the clutch connection state, and parking that detects the operating state of the parking brake A brake sensor; and a vehicle stop determining means for determining whether or not the vehicle is stopped. When the vehicle stop determination is made by the vehicle stop determining means, the detection of each of the sensors detects a predetermined engine speed or less, When the parking brake is operated while the position neutral and clutch pedal non-pressing state are detected In addition, the idling stop means stops the engine,
A vehicle braking state control device, wherein the braking force holding means releases the holding of the braking force. 2. A vehicle braking state control device comprising: a braking force holding unit that controls holding of a braking force when the vehicle is stopped; and an idling stop unit that stops an engine at a predetermined time when the vehicle is stopped. The braking force holding means releases the braking force holding simultaneously with the operation of the idling stop means.