JPS631643Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a parking lock device for a vehicle, and more particularly to a device for electromagnetically locking a brake pedal to maintain a braking state under desired braking conditions.

Braking devices for vehicles include a foot brake, which decelerates or stops a moving vehicle by operating the brake pedal, and a parking brake, which prevents a stopped vehicle from starting. , a brake that temporarily locks the foot brake in a predetermined braking state using electromagnetic means such as an electromagnetic solenoid, and performs an auxiliary parking braking action by holding the foot brake even if the driver takes his or her foot off the foot brake. Locking devices are well known. According to such a brake lock device, it is possible to obtain the desired parking brake action without operating the parking brake when waiting at a traffic light, on a slope, or when stopping temporarily, etc., reducing the burden on the driver or preventing physical disabilities. This has the advantage that it is possible to provide a device with extremely excellent operability to people.

However, with this type of braking device, the auxiliary parking brake by locking the foot brake is overused as a substitute for the handbrake or other main parking brake, and there are problems such as braking failure occurring under such incorrect usage conditions. It was hot. In other words, an auxiliary parking brake using an electromagnetic locking mechanism is less reliable than a mechanical parking brake. There may be cases where it is not possible to lock the
In such a case, there is a problem in that the vehicle is left unbraked. In particular, if the no-braking condition occurs while the driver is seated, the foot brake or parking brake can be operated immediately, but when the driver leaves the seat, only the auxiliary parking brake is activated. When the vehicle is braked, there is a drawback that no back-up can be performed when a non-braking condition occurs.

The present invention has been developed in view of the above-mentioned conventional problem, and its purpose is to release the brake lock state of the brake lock mechanism when the parking brake is in the non-braking state with the brake lock state being released by a process other than depressing the accelerator. An object of the present invention is to provide a parking lock device for a vehicle that can prevent the vehicle from being left unbraked.

In order to achieve the above object, the present invention provides a braking force retention mechanism that is installed in the service wheel brake system and automatically maintains the service wheel brake in a braking state according to predetermined braking conditions, and a braking force holding mechanism that is provided in the service wheel brake system and that is separate from the service wheel brake system. a parking brake that is provided to prevent the starting of a stopped vehicle; and a parking brake drive device that drives the parking brake to a braking state and a braking release state under predetermined conditions, and the parking brake drive device drives the regular wheel brake system under predetermined braking conditions. A parking lock device for a vehicle that can automatically hold the parking brake in a braking state and that can automatically put the parking brake in a braking state includes a parking brake switch that detects the operating state of the parking brake, the braking force holding mechanism, and a control circuit for controlling a parking brake drive device; the control circuit includes a computing unit that supplies a control signal to the braking force holding mechanism and the parking brake drive device based on an ignition signal and a parking brake signal; a delay circuit that continues to supply battery voltage to the arithmetic unit for a certain period of time after the ignition switch is turned off; , and the ignition key is turned off, the brake lock state of the service wheel brake system continues for a certain period after the ignition switch is turned off, determined by the delay circuit, and the parking brake is put into the braking state during this period. The present invention is characterized in that it controls the drive and further releases the brake lock of the service wheel brake system after the parking brake has been driven to the braking state.

Preferred embodiments of the present invention will be described below based on the drawings.

The figure shows a preferred embodiment in which the vehicle brake lock device according to the present invention is applied to an automatic vehicle. A mechanism 10 is provided. This brake lock device 10 temporarily locks the foot brake in a predetermined braking state by electromagnetic means such as an electromagnetic solenoid after the above-mentioned predetermined condition has elapsed, for example, one second has elapsed since the vehicle has stopped, so that the driver can Even if the foot is released from the brake, an auxiliary parking braking operation can be performed by holding the foot brake.

The brake lock state can be released by depressing the accelerator pedal, but the brake lock state can be released in various other states.

That is, since the brake lock mechanism 10 consumes a large amount of electric power in the brake lock state, it is released even when the ignition switch 12 is turned off or when the driver leaves the seat while the ignition switch 12 is turned on. It is structured as follows.

A seat switch 14 is provided in the driver's seat to detect when the driver leaves the seat, and a computing unit 16 (to be described later) provided to release the brake lock state under predetermined release conditions is an ignition switch. Ignition signal 200 from switch 12
and the leave signal 202 from the seat switch 14 is input. Based on the ignition signal 200 and the leave signal 202, the computing unit 16 locks the brake lock mechanism 10 when the ignition switch 12 is turned off or when the driver leaves the seat when the ignition switch 12 is turned on. Brake lock control signal 204 goes “L” to
is output to release the brake lock state. Therefore, the power consumption of the brake lock mechanism 10 can be reduced to the minimum necessary, and the consumption of the battery 18 can be reduced.

However, when the brake locking state of the brake lock mechanism 10 is released by other than depressing the accelerator, the braking operation of the parking brake 20 or the switching operation of the transmission (not shown) to the parking range position, which will be described later, will not be possible. If this is not done, a situation will occur where the vehicle is left without braking.

Therefore, in the present invention, when the transmission is in a range position other than the parking range in the brake lock state and the parking brake 20 is in the non-braking state, the brake lock state of the brake lock mechanism 10 can be released by other than depressing the accelerator. In this case, the brake lock mechanism 10 continues to be in the brake lock state, and the parking brake 20 is maintained in the braking state, and the parking brake 2
It is characterized in that the brake locking state of the brake locking mechanism 10 is released after the braking state of 0 is maintained.

The parking brake 20 described above includes a brake lever assembly 22 for manually operating the parking brake, and the brake lever assembly 22 has a brake lever 26 rotatably connected to a shaft 24. One end of the brake lever 26 is connected to a brake mechanism (not shown) of the parking brake 20, and by rotating the brake lever 26 clockwise in the figure, the braking action of the parking brake 20 can be obtained. .

Next, a parking brake drive device 28 as described below is provided in order to automatically drive the parking brake 20 under predetermined drive conditions to obtain a braking action.

That is, one end of a flexible wire 32 is pivotally connected to one end of the brake lever 26 by a pin 30, and a rod 36 of a vacuum actuator 34 that utilizes engine negative pressure is connected to the other end of the flexible wire 32. It is pivoted at 38. The reason why the brake lever 26 and the rod 36 of the vacuum actuator 34 are connected by the flexible wire 32 is that when the driver manually operates the brake lever 26, the vacuum actuator 34 is affected. This is to prevent the force from being applied to the vacuum actuator 34 when the flexible wire 32 is bent by manual operation of the brake lever 26. Therefore, the flexible wire 3
It is also possible to use a link or the like instead of 2.

The vacuum actuator 34 is a diaphragm plate 4 that holds a diaphragm 40 made of rubber or the like.
2 into a negative pressure chamber 44 and a variable pressure chamber 46, and the diaphragm plate 42 is urged rightward in the figure by a spring 48. Negative pressure chamber 4
4 is connected to a negative pressure source such as an engine intake manifold 52 or a vacuum pump (not shown) through a vacuum pipe 50, so that negative pressure is maintained at all times. Note that a check valve 54 is provided in the middle of the vacuum piping 50 in order to maintain the negative pressure in the negative pressure chamber 44 even after the engine is stopped. On the other hand, the variable pressure chamber 46 is connected to the intake manifold 52 via a solenoid valve 56 provided in the middle of the vacuum piping 50, and the solenoid valve 56 communicates with an inlet port 58 connected to the intake manifold 52 and the variable pressure chamber 46. It has an outlet port 60 and an atmospheric passage 62. When the excitation current is not flowing through the operating coil 64 of the electromagnetic valve 56, the inlet port 58 and the outlet port 60 are open, and the atmospheric passage 62 is closed. It becomes pressure. Further, when an excitation current flows through the operating coil 64 of the electromagnetic valve 56, the inlet port 58
becomes a closed circuit, and the outlet port 60 and atmospheric passage 62
Since the circuit becomes open, the atmosphere is introduced into the variable voltage chamber 46. As a result, the diaphragm plate 42 moves to the left in the figure against the biasing force of the spring 48, and the rod 36 moves in the same direction accordingly.

In addition, in this embodiment, the brake lever 26
Although an example is shown in which the actuator is driven by the vacuum actuator 34, it is also possible to use electromagnetic force such as a solenoid, compressed air, or hydraulic pressure.

On the other hand, the vehicle is provided with a parking range detection switch 66 for detecting the parking range position of the transmission, and a parking brake switch 68 for detecting the operating state of the parking brake 20.

A control circuit 70 including an arithmetic unit 16 is provided to control the brake lock mechanism 10 and the parking brake drive device 28 under predetermined brake lock conditions. It has a delay circuit 72 for ensuring that the arithmetic unit 16 is energized for a certain period of time. In this embodiment, the above-mentioned predetermined brake lock condition is applied to the ignition switch 1.
2. Seat switch 14, parking range detection switch 66, and parking brake switch 6
Detected at 8. As a result of detecting these, the control circuit 70 determines that when the transmission is in the brake lock state, the transmission is in a range other than the parking range, and the parking brake is in the non-braking state, the brake lock state of the brake lock mechanism 10 is released by any operation other than depressing the accelerator. If the brake lock mechanism 10 is
is output to continue the brake lock state, and at the same time, a drive signal 206 is output to the parking brake drive device 28 to maintain the parking brake 20 in the braking state. After the parking brake 20 is maintained in the brake state, the control circuit 70 outputs a brake lock control signal 204 of "L" to the brake lock mechanism 10 to release the brake lock state.

A buzzer 74 is provided to alert the driver that the main parking brake of the vehicle has been left unbraked, and this buzzer 74 alerts for a certain period of time when the brake lock mechanism 10 is released. It is configured as follows.

The embodiment of the present invention has the above configuration, and its operation will be explained below.

The brake lock mechanism 10 is released when the brake lock mechanism 10 is in a locked state other than when the accelerator is depressed, for example, when the ignition switch 12 is turned off, or when the ignition switch 12 is turned on and the driver leaves the seat. be done. Parking brake 2 when these are released.
If the 0 braking operation or the transmission switching operation to the parking range position is not performed, the vehicle may be left in an unbraked state, so the present invention automatically applies the parking brake 20 in such a case. The system operates to ensure that the vehicle is properly braked.

First, when the brake is locked, the transmission is in a position other than the parking range, and the parking brake is not applied, the ignition switch 1
The case where 2 is turned off will be explained.

After the ignition switch 12 is turned off, the delay circuit 72 supplies the voltage of the battery 18 to the arithmetic unit 16 for a certain period of time. The computing unit 16 includes an ignition switch 12 and a parking range detection switch 66.
Based on the ignition signal 200, parking range detection signal 208, and parking brake signal 210 output from the parking brake switch 68, the transmission is in a position other than the parking range position, and the parking brake 20 is in a non-braking state, Make sure that the ignition switch 12 is turned off. Then, the computing unit 16 outputs a brake lock control signal 204 of "H" to the brake lock mechanism 10 to maintain the brake lock state, and outputs a drive signal 206 of "H" to the operating coil 64 of the electromagnetic valve 56. . The inlet port 58 of the electromagnetic valve 56 is closed, the outlet port 60 and the atmosphere passage 62 are opened, and the atmosphere is introduced into the variable pressure chamber 46 of the vacuum actuator 34. As a result, the diaphragm plate 42 of the vacuum actuator 34 moves to the left in the figure against the biasing force of the spring 48, so the brake lever 34 moves to the left in the figure.
6 can rotate clockwise to maintain the parking brake 20 in a braking state. Then, the parking brake switch 68 detects the brake holding state of the parking brake 20 and outputs a parking brake signal 210 to the control circuit 70, so the control circuit 70 outputs a brake lock control signal 204 of "L" to the brake lock mechanism 10. At this point, the brake lock state is released for the first time.

In this way, if the ignition switch 12 is turned off while the transmission is in a range other than the parking range and the parking brake is not applied in the brake lock state, the brake lock mechanism 10 maintains the brake lock state. By releasing the brake lock state only after the parking brake 20 is held in the brake state, it is possible to prevent the vehicle from being left unbraked.

Further, after the parking brake 20 is maintained in the braking state, the current supply to the brake lock mechanism 10 is cut off, so that consumption of the battery 18 can be reduced.

Next, if the transmission is in a position other than the parking range with the brake locked, the parking brake 2
0 is in non-braking state and ignition switch 1
A case where the driver leaves the seat while the switch 2 is in the ON operating state will be explained.

The control circuit 70 includes the ignition switch 12,
Ignition signals 20 are output from the seat switch 14, the parking range detection switch 66, and the parking brake switch 68, respectively.
0, the vehicle is confirmed to be in the above-mentioned state based on the leave signal 202, the parking range detection signal 208, and the parking brake signal 210. Then, the control circuit 70 outputs a brake lock control signal 204 of "H" to the brake lock mechanism 10 to maintain the brake lock state, and also supplies excitation current to the operating coil 64 of the electromagnetic valve 56 to perform the above-mentioned operation. Performs a braking holding action of the parking brake 20. Note that during the period from when the driver leaves the seat to when the parking brake 20 performs the braking holding action, the buzzer 74 alerts the driver that the main parking brake of the vehicle has been left in an unbraked state. And parking brake switch 6
8 detects the braking holding action of the parking brake 20 and sends a parking brake signal 21 to the control circuit 70.
0, the control circuit 70 outputs a brake lock control signal 204 of "L" to the brake lock device 10, and at this point the brake lock state is released for the first time.

In this way, if the driver leaves his/her seat while the transmission is in a position other than the parking range in the brake lock state, the parking brake 20 is in the non-braking state, and the ignition switch 12 is in the ON state, the brake lock mechanism By maintaining the brake lock state of 10 and releasing the brake lock state only after the parking brake 20 maintains the braking state, it is possible to prevent the vehicle from being left unbraked.

Further, after the parking brake 20 is maintained in the braking state, the current supply to the brake lock mechanism 10 is cut off, so that consumption of the battery 18 can be reduced.

As explained above, according to the present invention, when the parking brake is in the non-braking state in the brake lock state, if the brake lock state of the brake lock mechanism is released by other than an operation of depressing the accelerator, the brake lock state of the brake lock mechanism is At the same time, a drive signal is output from the control circuit to the parking brake drive device to keep the parking brake in the brake state, and after the parking brake is in the brake state, the brake lock mechanism of the brake lock mechanism is released from the brake lock state. It is possible to prevent the occurrence of a situation in which the vehicle is left in a braking state.

[Brief explanation of the drawing]

The figure is an explanatory view showing a preferred embodiment of a parking lock device for a vehicle according to the present invention. 10... Brake lock mechanism, 12... Ignition switch, 14... Seat switch, 2
0... Parking brake, 28... Parking brake drive device, 68... Parking brake switch, 70... Control circuit, 204... Brake lock control signal, 206... Drive signal.

Claims (1)

[Scope of Claim for Utility Model Registration] A braking force retention mechanism that is provided in the brake system of the service wheel and automatically maintains the service wheel brake in a braking state under predetermined braking conditions, and a braking force retention mechanism that is provided separately from the service wheel brake system. a parking brake that prevents the starting of a stopped vehicle; and a parking brake drive device that drives the parking brake to a braking state and a braking release state under predetermined conditions, the parking brake drive device automatically controlling the service wheel brake system under predetermined braking conditions. A parking lock device for a vehicle that can maintain a braking state automatically and automatically control a parking brake to a braking state, comprising: a parking brake switch that detects the operating state of the parking brake; and the braking force holding mechanism and the parking brake. a control circuit for controlling the drive device; the control circuit includes a computing unit that supplies a control signal to the braking force holding mechanism and the parking brake drive device based on an ignition signal and a parking brake signal; and a delay circuit that continues to supply battery voltage to the arithmetic unit for a certain period of time after the off-operation of the brake switch. In addition, when the ignition key is turned off, the brake lock state of the service wheel brake system continues for a certain period of time after the ignition switch is turned off, which is determined by the delay circuit, and during this period, the parking brake is controlled to be in the braking state. The parking lock device for a vehicle is further characterized in that the brake lock of the service wheel brake system is released after the parking brake is completely driven to the braking state.