JPS61188259A - Brake device for car - Google Patents

Abstract

PURPOSE:To prevent running out of a car due to the occurrence of creep, by a method wherein an autobrake system is worked during a specified time after the starting of an engine. CONSTITUTION:From a state in that, with a main switch 25 OFF, a car is brought to a stop, an ignition switch 22 is turned ON to start an engine. In which case, a current is supplied from a power source 23 to a coil 30 of a relay 31 only during a given time which is decided by a capacitor 32, and a first switch 27 is turned ON. As a result, a current is supplied from a power source 23 to a controller 16 through a first switch 27 bypassing a main switch 25. This causes a controller 16 to actuate a brake control mechanism 2 despite of that the main switch 25 is OFF.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention automatically controls the brakes according to the driving condition of the automobile, independent of the brake operation system that operates the brakes by the driver's operation of the pedal or lever. An automobile brake system having an automatic brake control system that
In particular, the present invention relates to a brake device as described above for a vehicle equipped with an automatic transmission.

(Prior Art) In recent years, ordinary 7-brake devices and handbrakes have been used as brake devices that obtain braking force to limit the running speed of automobiles, to stop them, or to prevent spontaneous movement of parked vehicles. In addition to such devices, attempts are being made to put into practical use an autobrake system that automatically controls braking timing and braking force depending on the driving condition of the vehicle. This autobrake system detects the driving state of a car based on various signals such as a vehicle speed signal and an accelerator position signal, and determines whether or not the detected driving state is a state in which the brakes should be applied. The system is configured to determine how much braking force is required when the vehicle is stopped, and to control the brakes according to the results of that determination.
Even after the driver releases the foot brake or hand brake, the brake is automatically maintained in an activated state.

However, such an autobrake system is equipped with a main switch on the power supply circuit for the entire system, and the system operates only when the driver turns on this main switch, and the above-mentioned effect occurs. The operation of the brakes is automatically controlled as shown in FIG. Therefore, if the driver does not correctly recognize the ON/OFF state of the main switch, for example, when the driver is stopped, he or she may mistakenly think that the brakes are working even though they are not. If the above-mentioned misidentification occurs in a car equipped with a transmission, the following problems will occur. That is, while the vehicle is stopped, the driver turns the main switch OFF, that is, the autobrake system is in a non-operating state, and the brakes are released, but the switch is turned ON, that is, the autobrake system is not activated. In order to start the car, I started the engine and changed the shift range of the automatic transmission to D or N range without operating the brake or handbrake. If the vehicle shifts to a driving range such as , the vehicle will fly out of the way contrary to the driver's expectations due to so-called creep.

In particular, if the car in question is parked without sufficient space in front and behind it and when it starts to move, if the car jumps out as described above, other cars parked in front of and behind it will This may lead to collisions with other obstacles.

By the way, Japanese Patent Application Laid-Open No. 51-43526 discloses an automobile stop control device that automates part of the brake operation. This includes a brake pedal that has a lever with a sawtooth section, a ratchet piece that can be engaged with the sawtooth section to prevent the brake pedal from returning when it is depressed, and a stop signal from a vehicle speed detector. Alternatively, the clutch pedal may include a solenoid that is controlled by a start signal or the like, and the ratchet piece may be engaged with or disengaged from the sawtooth portion of the clutch pedal depending on whether the solenoid is activated or deactivated. According to this device, when the car is stopped,
When the brake pedal is depressed, the ratchet piece is engaged with the serrated portion of the brake pedal based on the stop signal from the vehicle speed detector, so that even if the driver removes his/her foot from the brake pedal, the pedal remains in place. The brake pedal is held in the depressed state, and when the brake pedal is started, the ratchet piece is disengaged from the sawtooth section based on a start signal from the vehicle speed detector, and the brake pedal is returned to its original position.

However, this device only keeps the brake pedal depressed from stopping to starting, and does not fully automate brake operation. 6N, OFI: If the condition is misidentified, the car may jump out due to creep at the time of starting as described above.

(Object of the Invention) The present invention is directed to the above-mentioned brake system for an automobile equipped with an automatic transmission, in which an auto brake system is used in addition to a brake operation system using a foot brake device and a hand brake device. To solve this problem, even if the main switch of the autobrake system is OFF, the autobrake system is configured to operate for a certain period of time after the engine starts to automatically apply the brakes. This allows the driver to turn off the main switch of the autobrake system when starting the car.
Misunderstanding that FF is ON when it is FF, the engine is started without operating the foot brake or hand brake, and the shift range is changed from N range or P range to D", 2.1° N range, etc. The purpose of this is to prevent the vehicle from flying out due to creep caused by shifting to the driving range.

(Structure of the Invention) In order to achieve the above object, the present invention is characterized by the following structure.

That is, an automatic brake control system is provided that is configured independently of a brake operation system that operates the brakes in response to the driver's braking operation, and that controls the brakes based on various status signals indicating the driving status of the vehicle. In an automobile brake system in which the power supply circuit is equipped with a main switch that turns the circuit ON and OFF, the automatic brake control system is configured to turn the main switch OFF for a predetermined period of time when the ignition switch is turned ON.
A control means is provided to operate the brake regardless of whether it is N or OFF. By the way, the automatic brake control system, that is, the autobrake system, is activated by power supplied from the power supply circuit when the main switch is ON, and for example, automatically applies the brakes when the car is stopped, and automatically applies the brakes when the car starts. However, when the main switch is OFF, no power is supplied from the power supply circuit, so the system does not operate, and the brake is operated only by the driver's 7-to-brake or handbrake operation. However, within a predetermined period of time after the engine starts, the autobrake system is activated by the control means described above even if the main switch is OFF, and this operation causes the autobrake system to operate as described above even if the brake or handbrake is not operated. The brake is automatically maintained in an activated state for a predetermined period of time.

<Effects of the Invention> According to the above configuration, in a vehicle equipped with an autobrake system in addition to a foot brake device and a handbrake device, especially a vehicle equipped with an automatic transmission, the main switch of the autobrake system is turned OFF. Even if the system is activated and the brakes are automatically applied within a predetermined period of time after the engine starts, the driver may turn on the main switch even though it is off. Even if you accidentally start the engine without operating the footbrake or handbrake and shift the shift range from N or P to the driving range, the car will not fly out due to creep. It becomes like this. As a result, when the above operation is performed to start a parked car, the car unexpectedly flies out and collides with other cars parked in front and behind the car or other obstacles. This will prevent such situations from occurring.

(Example) Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 1, an automobile brake system @1 includes a brake operating mechanism 2 and an automatic control system 3 that automatically controls the operating mechanism 2 according to various states of the automobile.

The brake operating mechanism 2 includes a brake pedal 4, a brake operating rod 5 linked to the pedal 4, and a mask cylinder 6 that generates hydraulic pressure according to the amount of movement of the brake operating rod 5 when the brake pedal 4 is depressed. The hydraulic pressure generated by the mask cylinder 6 is supplied to a wheel cylinder (not shown). diaphragm 7
a are consecutively provided.

On the other hand, the automatic control system 3 includes a negative pressure introduction passage 9 led from the negative pressure source 8 to the negative pressure chamber 71 of the vacuum booster 7, and an air cleaner 10 connected to the variable throttle 11 and the negative pressure chamber 71 of the vacuum booster 7. The air introduction passage 13 guided through the first on-off valve 12 communicates with the vacuum booster 7 side of the first on-off valve 12 in the air introduction passage 13 and the negative pressure introduction passage 9 through the second on-off valve 14. and a controller 16 for outputting a first opening/closing signal a, a second opening/closing signal S, and a flow rate adjustment signal C to the first opening/closing valve 12, the second opening/closing valve 14, and the variable throttle 11. It is being And, this controller 16 has
A vehicle speed signal d from the vehicle speed sensor 17, a shift position signal e from the shift sensor 18 that detects the shift range of the automatic transmission, and an accelerator signal f from the accelerator switch 19.
A foot brake signal 0 from the foot brake switch 20 and a hand brake signal 0 from the hand brake switch 21 are input.

Furthermore, a power supply circuit 24 led from a power supply 23 via an ignition switch 22 is connected to this controller 16, and between the ignition switch 22 and the controller 16 in the power supply circuit 24,
A main switch 25 is provided to supply power from the power source 23 to the controller 16, in other words, to execute and stop automatic control of the brake operating mechanism 2 by the controller 16, and this main switch 25 is turned on and off by the driver. ing.

However, in addition to the above-mentioned configuration, this automatic control system 3 includes a control circuit that allows power to be supplied from the power source 23 to the controller 16 even if the main switch 25 is OFF within a predetermined time after the engine starts. 26 are provided. This control circuit 26 includes a first switch 27 provided in parallel with the main switch 25, a second switch 29 provided in series with the brake pedal switch 28,
The relay 31 includes a coil 30 that turns on the first switch 27 and the second switch 29 by being excited when energized. The coil 30 is supplied with power from the power source 23 via the ignition switch 22, and a capacitor 32 and a resistor 33 are connected in parallel to the ground side of the coil 30, and the ignition switch 22 is connected to the ground side of the coil 30. When turned on from OFF, the electric current m2 remains for a time corresponding to the capacitance of the capacitor 32.
3, the coil 30 is energized.

Next, the operation of the above embodiment will be explained.

First, assuming that the main switch 25 is turned on and the vehicle is in a normal running state (ignition switch 22 is turned on), the first on-off valve 12 on the air introduction passage 13 in the brake operating mechanism 2 is closed. By opening the second on-off valve 14 on the communication path 15, the negative pressure chamber 71 and atmospheric chamber 72 of the vacuum booster 7 are opened.
Negative pressure is introduced into both chambers from a negative pressure source 8, whereby the diaphragm 7a and the brake operating rod 5' are held at the neutral position (position M in the figure), and the brake is maintained in a released state. While driving in this state, the driver has the intention to apply the brakes using, for example, the vehicle speed signal d from the vehicle speed sensor 17, the accelerator signal f from the accelerator switch 19, the foot brake signal O from the foot brake switch 20, etc. If the controller 16 determines that the vehicle is stopped based on the vehicle speed signal d1, the accelerator signal f, the shift position signal e from the shift sensor 18, etc., and the foot brake switch 20 and hand brake switch 21 Each brake signal of 0. h indicates that the driver is not applying the brakes, the controller 16 instructs the first on-off valve 12 to open and the second on-off valve 14 to close. Second opening/closing signals a and b are output. As a result, air is introduced from the air introduction passage 13 into the atmospheric chamber 72 of the vacuum booster 7, the diaphragm 7a and the brake operating rod 5 are moved in six directions, and the brake is operated accordingly. Here, the magnitude of the braking force when operating the brake is determined by changing the flow path area of the variable throttle 11 according to the flow rate adjustment signal O output from the controller 16, and thereby the air introduced into the atmospheric chamber 72. This is done by adjusting the flow rate. on the other hand,
When the main switch 25 is OFF, the power [
Since power is not supplied from 23 to the controller 16,
The brake operating mechanism 2 is not controlled by the controller 16 as described above, and in this case, the brakes are operated only by the driver's operation of the brake pedal 4 or the operation of the handbrake.

However, when the car is stopped with the main switch 25 in the OFF state and the ignition switch 22 is turned ON to start the engine in order to start the car in this state, the predetermined time determined by the capacitance of the capacitor 32 Then, power is supplied from the power supply 23 to the coil 30 of the relay 31, and the first switch 27 is turned on.

Therefore, within the predetermined time period, power is supplied from the power supply 23 to the controller 16 via the first switch 27 that bypasses the main switch 25, and due to this power supply, even though the main switch 25 is OFF. , the controller 16 operates the brake operating mechanism 2.

This allows the driver to temporarily turn off the main switch 25.
However, the driver misunderstood that it was on, and started the engine without operating the footbrake or handbrake, and shifted the automatic transmission's shift range to P.
Microwave or N range, 2. Even if you shift into Lunge or R range, the brakes are still active, so the car won't creep out unexpectedly and cause a collision with another car parked in front or behind you. This will be prevented.

When the handbrake is activated, the vehicle does not jump out as described above, so there is no need to operate the brake by the controller 16 when the ignition switch 22' is turned from OFF to ON with the main switch 25 OFF. Further, in this embodiment, when the foot brake is operated, the brake pedal switch 28 and the second switch 29 in the relay 31 are turned off.
Therefore, even if the ignition switch 22 is turned from OFF to ON, power is not supplied from the power supply 23 to the capacitor 32. This is because there is no need for the controller 16 to actuate the brake in this case as well.

The controller 16 is also equipped with a manual switch 34 that inputs a brake operation signal as appropriate, but this switch 34 is used to frequently apply the brakes while driving at extremely low speeds, such as when the road is congested. It is used when it is necessary to operate the system, and is installed near the steering wheel so that it can be operated with the driver's fingertips while driving. Then turn this switch 34 to
N, the controller 16 switches the first on-off valve 1
2. Signals a and b to the second on-off valve 14 and variable throttle 11
, c are output, and the brake is automatically activated.

[Brief explanation of drawings]

FIG. 1 is a control system diagram showing an embodiment of the brake device of the present invention. DESCRIPTION OF SYMBOLS 1... Brake device, 3... Automatic brake control system (automatic control system), 22... Ignition switch, 24... Power supply circuit, 25... Main switch, 26... Control means (control circuit).

Claims (1)

[Claims] (1) A braking device for a vehicle that is configured independently of a brake operation system that operates the brakes in response to a driver's braking operation, and that has an automatic brake control system that controls the brakes based on various status signals indicating the driving status of the vehicle. The automatic brake control system is provided with a power supply circuit to the system, and a main switch for turning the power supply circuit ON and OFF, and for turning the main switch ON and OFF.
A braking device for a motor vehicle, comprising a control means for operating the brake for a predetermined period of time when an ignition switch is turned on, regardless of whether the ignition switch is turned off.