JPS6342675Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a braking force holding device for a vehicle, and particularly to a braking force holding device for a vehicle that uses electromagnetic means for holding the braking force to hold the braking force of the vehicle's service brake. be.

BACKGROUND TECHNOLOGY There are two types of braking devices for vehicles: a service brake that decelerates or stops a running vehicle by operating a brake pedal, and a parking brake that prevents a stopped vehicle from moving. Although they can be used in different ways, there is a well-known device that temporarily retains the braking force of the service brake using electromagnetic means such as an electromagnetic solenoid, and performs an auxiliary parking braking operation even when the driver takes his foot off the brake pedal. . According to such a braking force holding device for a vehicle, 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 the vehicle is temporarily stopped, etc., thereby reducing the burden on the driver. This has the advantage of being able to provide a device with extremely high operability to physically handicapped people.

In this type of braking force holding device,
When the vehicle starts, the braking force is released by operating the accelerator, and the holding of the braking force is released when a parking brake operation is performed, such as a parking brake operation or a shift operation to the parking position of an automatic vehicle.

However, in such conventional braking force retention devices for vehicles, the main switch that supplies power to the control circuit for controlling the electromagnetic means is usually installed, for example, in a console box, so the braking force of the service brake is There is a problem in that if the main switch is unexpectedly turned off by, for example, a child in the passenger seat while the brake is being held, the power to the control circuit will be cut off and the vehicle will be left in an unbraked state. Ta.

Purpose of the invention The present invention was devised in view of the above-mentioned conventional problems, and its purpose is to provide a vehicle that can maintain braking force when the main switch is turned off while the service brake is holding the braking force. An object of the present invention is to provide a braking force holding device.

Structure of the Invention In order to achieve the above object, the present invention provides a braking force retention device for a vehicle that retains the braking force of a service brake, and includes an electromagnetic means for retaining braking force and a control circuit for controlling the operation of the electromagnetic means. A detection mechanism for detecting the operation of the electromagnetic means is provided, and a contact mechanism that operates on and off in conjunction with the detection mechanism is connected in parallel to the main switch that supplies power to the control circuit, and a contact mechanism that operates on and off in conjunction with the detection mechanism is connected in parallel to the main switch that supplies power to the control circuit. The braking force is maintained by the electromagnetic means when the detection mechanism is activated, the contact mechanism is turned on, and the main switch is turned off.

Embodiments Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

The figure shows a block circuit of a braking force retention device for a vehicle according to an embodiment of the present invention.

In the figure, an accelerator signal 100, a brake signal 102, a vehicle speed signal 104, etc. are supplied to a holding condition determining circuit 10 constituting a control circuit. Based on signal 104, it is determined whether or not to maintain the braking force, and if the braking force is to be maintained, the determination signal 106 is set to "H" level. The release condition determination circuit 12 that constitutes the control circuit also includes a parking brake signal (hereinafter referred to as PKB signal) 108,
A parking range signal (hereinafter referred to as P range signal) 110, an accelerator signal 112, etc. are supplied,
The release condition determination circuit 12 receives the PKB signal 108,
It is determined whether or not to release the holding based on the P range signal 110, the accelerator signal 112, etc., and when the holding is to be released, the determination signal 114 is set to the "H" level. The holding condition determining circuit 10 and the releasing condition determining circuit 12 are connected to a self-holding circuit 14 that constitutes a control circuit, and a braking force holding signal 116 from the self-holding circuit 14 is sent to, for example, an electromagnetic solenoid 16 as an electromagnetic means for holding the braking force. Supplied.

When the braking force is to be maintained, the brake signal 102 is supplied to the holding condition determination circuit 10 by operating the brake pedal, and the vehicle speed signal 104 indicates that the vehicle has been stopped without causing wheel lock. Upon detection, the determination signal 106 goes to "H" level, and the self-holding circuit 14 sets the braking force holding signal 116 to "H" level. Therefore,
Since the braking force holding signal 116 becomes "H" level, the electromagnetic solenoid 16 is energized, the brake pedal is held in the depressed position, and the braking force is held. To release the braking force, operate the accelerator pedal to supply the accelerator signal 112 to the release condition determination circuit 12, or perform a parking brake operation and transmit the PKB signal 108 or P range signal 110 to the release condition determination circuit 12. By supplying the determination signal 114 to the "H" level, the braking force holding signal 116 from the self-holding circuit 14 switches from the "H" level to the "L" level. Therefore, since the braking force holding signal 116 goes to the "L" level, the holding of the brake pedal is released and the holding of the braking force is released.

Power is supplied to the control circuit via the main switch 18. Therefore, in the conventional device, if the electromagnetic solenoid 16 is energized and the braking force of the service brake is maintained, if the main switch 18 is suddenly turned off, the control circuit will no longer operate and the energization of the electromagnetic solenoid 16 will stop. However, there was a problem in which the braking force retention was released.

What is unique about this invention is that it is provided with a detection mechanism that detects that braking force is being maintained, and that a contact mechanism that operates on and off in conjunction with the detection mechanism is connected in parallel to the main switch. In the example, a relay 20 is provided in parallel with the electromagnetic solenoid 16, and a contact mechanism 22 that operates in conjunction with the relay 20 is connected to the main switch 18 in parallel.

When the braking force of the service brake is to be maintained, the braking force holding signal 116 becomes "H" level, so the electromagnetic solenoid 16 is energized, and at this time, the relay 20 is energized by the braking force holding signal 116. Therefore, the contact mechanism 22 is turned on. Therefore, the current from the vehicle power source is supplied not only through the main switch 18 but also through the contact mechanism 22. Therefore, even if the main switch 18 is suddenly turned off while the service brake is holding the braking force, the contact mechanism 22 is in the on state, so current from the vehicle power supply is supplied via the contact mechanism 22. The excitation of the electromagnetic solenoid 16 is maintained, and the braking force is maintained.

Note that if the determination signal 114 from the cancellation condition determination circuit 12 becomes "H" level after that,
The braking force holding signal 116 changes from “H” level to “L” level.
level, and the excitation of the electromagnetic solenoid 16 is stopped. At this time, the braking force holding signal 116 becomes "L" level, so the excitation of the relay 20 is stopped and the contact mechanism 22 is turned off.

As described above, according to the embodiment of the present invention, the braking force can be maintained even when the main switch is turned off while the service brake is holding the braking force.

In addition, in the braking force holding device of the embodiment, the electromagnetic means for holding the braking force consists of the electromagnetic brake 16, and the device is shown in which the brake pedal is held at the braking position by the electromagnetic brake 16, but the present invention has the following features:
It is also possible to apply other methods of retaining braking force, such as a device that retains braking oil pressure on the wheel cylinder side.

Effects of the Invention As explained above, according to the present invention, a detection mechanism for detecting the operation of the electromagnetic means is provided, and a contact mechanism that operates on and off in conjunction with the detection mechanism is provided in the main switch that supplies power to the control circuit. Since they are connected in parallel, when the electromagnetic means is in operation, the detection mechanism is activated and the contact mechanism is turned on, and when the main switch is turned off, the braking force can be maintained by the electromagnetic means.

[Brief explanation of the drawing]

The figure is a block circuit diagram of a braking force retention device for a vehicle according to an embodiment of the present invention. 16... Electromagnetic solenoid, 18... Main switch, 20... Relay, 22... Contact mechanism.

Claims (1)

[Scope of utility model registration request] In a braking force retention device for a vehicle that includes an electromagnetic means for retaining braking force and a control circuit for controlling the operation of the electromagnetic means and retains the braking force of a service brake, a detection mechanism for detecting the operation of the electromagnetic means is provided. A contact mechanism that operates on and off in conjunction with the detection mechanism is connected in parallel to the main switch that supplies power to the control circuit, and when the electromagnetic means is in operation, the detection mechanism operates and the contact mechanism is turned on. A braking force retention device for a vehicle, characterized in that braking force retention is maintained by electromagnetic means when a main switch is turned off.