JPH066144U - Vehicle braking system - Google Patents

Abstract

(57) [Abstract] [Purpose] In a vehicle with an electromagnetic clutch, we have proposed a solenoid valve that can hold the brake pressure continuously for a short time when the brake pedal is depressed to the accelerator pedal. Be able to start safely without any operation. [Structure] The vehicle braking device has a solenoid valve 4 in a pipe connecting the master cylinder 2 and the brake cylinder 3 for shutting off an oil passage. The solenoid valve 4 operates from a brake pedal when the vehicle is stopped. It is equipped with a control circuit that can hold the brake pressure for a short time when the accelerator pedal is depressed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle having an electromagnetic clutch, for example, a belt type continuously variable transmission (CVT) or a conventional automatic transmission in which a transmission is switched by computer control so that a vehicle can be easily started on a slope. It is about.

[0002]

[Prior art]

 Generally, in a vehicle equipped with a torque converter (torque converter vehicle), power is always transmitted by the torque converter. Therefore, if the transmission is in the drive range of drive (D) or reverse (R) and is connected to the wheels. , The creep phenomenon occurs and the vehicle runs at low speed. This creep phenomenon is effective when used effectively for extremely low speed running in traffic jams and starting on slopes. However, at high idle speed, etc., it is required to depress the brake securely in order to completely stop the vehicle due to the increase in creep force. On the other hand, in most conventional vehicles with an electromagnetic clutch, the clutch current is generally cut off to release the clutch when the vehicle is stopped, so there is no creep phenomenon even if the engine speed reaches high idle for some reason. Therefore, it is possible to avoid the unexpected situation of sudden start.

[0003]

[Problems to be solved by the device]

 However, in vehicles with an electromagnetic clutch, there is no creep phenomenon, so there is a danger that the vehicle will move backward when changing from the brake pedal to the accelerator pedal when starting on a slope, and it was necessary to operate the side brakes to start. Also, in vehicles with an electromagnetic clutch, the clutch torque can be controlled arbitrarily by the clutch current, so it has been proposed that the occurrence of creep is controlled by the driver's intention. However, if the brake pedal is accidentally turned on while the brake pedal is open during high idle rotation, the vehicle may suddenly start.

In view of the above, the present invention proposes a solenoid valve in a vehicle with an electromagnetic clutch, which is capable of continuously holding the brake pressure for a predetermined time during the stepping from the brake pedal to the accelerator pedal. An object of the present invention is to provide a vehicle braking device that can be started safely without operating a side brake.

[0005]

[Means for Solving the Problems]

 For this reason, the vehicle braking device of the present invention has a solenoid valve 4 in the pipe that connects the master cylinder 2 and the brake cylinder 3 to shut off the oil passage. It has a structure characterized by having a control circuit that can maintain the brake pressure continuously for a certain period of time during which the brake pedal is changed to the accelerator pedal, and this is a means for solving the problem. It is a thing.

[0006]

[Action]

 When the accelerator pedal is released and the brake pedal is depressed while the vehicle is stopped, the control device outputs a signal from the AND circuit to operate the solenoid valve 4. Specifically, if the brake is applied while the vehicle is running and the brake pedal is continuously depressed while the vehicle is stopped, the solenoid valve 4 switches to the A position and holds the brake pressure.

Subsequently, in order to start the vehicle from the above state, when the foot is released from the brake pedal and the accelerator pedal is depressed, the solenoid valve is operated only while the ON signal is being output by the dime delay 8 (2 to 3 seconds). Continue to hold 4 in the A position and hold the brake pressure. However, when this time elapses, the output signal from the AND circuit disappears, the solenoid valve 4 is switched to the B position, the brake is released, and the vehicle is started by depressing the accelerator pedal. As described above, according to the present invention, since the brake pressure can be maintained for a predetermined time while the brake pedal 1 is changed to the accelerator pedal, the vehicle can be started easily without operating the side brake even on an uphill road.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram of a vehicle braking device according to an embodiment of the present invention. As shown in FIG. 1, a vehicle brake includes a master cylinder 2 that generates a brake pressure by operating a brake pedal 1 and a brake cylinder 3 that applies a brake to a wheel by a brake pressure supplied from the master cylinder 2. When the brake pedal is operated, the brake pressure acts on the brake cylinder and the vehicle can be stopped.

In this embodiment, a solenoid valve 4 that shuts off the oil passage is provided in the pipe that connects the master cylinder 2 and the brake cylinder 3 described above. This solenoid valve 4 has the function of continuously holding the brake pressure for a predetermined time while the vehicle is stopped and changing from the brake pedal to the accelerator pedal, which allows the side brakes to be operated even when starting on a slope. It is designed to be easy to start without.

The control circuit for controlling the operation of the solenoid valve 4 will be further described below with reference to FIG. 2. The control circuit includes a brake switch 5, an accelerator switch 6, a speed sensor 7, a time delay 8, an inverter 9, It is composed of an AND circuit 10. The brake switch 5 is a switch that outputs an ON signal when the brake pedal is depressed, and the accelerator switch 6 is a switch that outputs an ON signal when the accelerator is depressed. Further, the speed sensor 7 is a sensor that outputs an ON signal when the vehicle is in a stopped state, and the time delay 8 outputs an ON signal of the brake pedal for a predetermined time (for example, 2 to 3 seconds) while changing over from the brake pedal to the accelerator pedal. The inverter 9 inverts the signal from the accelerator switch. The signals from the brake switch 8, the accelerator switch 6, and the speed sensor 7 are input to the AND circuit 10, and the solenoid valve is controlled by the output signal from the AND circuit.

Therefore, when the accelerator pedal is released and the brake pedal is depressed while the vehicle is stopped, the control circuit outputs a signal from the AND circuit and holds the solenoid valve 4 at the A position. Specifically, the brake is applied while the vehicle is running, and if the brake pedal is continuously depressed while the vehicle is stopped, the solenoid valve 4 switches to the A position and holds the brake pressure.

Subsequently, in order to start the vehicle from the above-described state, when the foot is released from the brake pedal and the accelerator pedal is changed, an on signal (output signal 1) is output from the dime delay 8 for 2 to 3 seconds. On the other hand, since the accelerator switch is not turned on until the accelerator pedal is depressed in this state, the output signal 1 is output from the inverter 9, and the output signal 1 is also output from the speed sensor because the vehicle is stopped. Is output. Therefore, the AND circuit outputs a signal for continuing to hold the electromagnetic valve 4 at the A position until the accelerator pedal is depressed, and holds the brake pressure.

However, when the accelerator pedal is depressed, the output signal from the AND circuit becomes zero, so the solenoid valve 4 switches to the B position and the vehicle starts. In this way, when the vehicle starts from an uphill temporary stop state, since the brake pressure can be maintained for a predetermined time while the brake pedal 1 is changed to the accelerator pedal, the vehicle can be started easily without operating the side brakes. Can be made.

As described above, in the present embodiment, the brake is applied while the vehicle is running, and if the brake pedal is kept depressed while the vehicle is stopped, the solenoid valve 4 switches to the A position and holds the brake pressure. Further, in order to start the vehicle from the above state, when the foot is released from the brake pedal and the accelerator pedal is depressed, the solenoid valve brakes only while the ON signal is being output by the dime delay 8 (2 to 3 seconds). Since the pressure is maintained, the vehicle can be easily started without operating the side brakes when the vehicle starts from a temporary stopped state on the uphill.

The solenoid valve 4 operates only when the vehicle is parked and the brake pressure is maintained when the brake pedal is depressed. Therefore, this solenoid valve cannot be used as a parking brake. Absent. Further, the delay time by the time delay 8 is not limited to 2 to 3 seconds, and can be set to an appropriate time at the time of design.

[0016]

[Effect of device]

 As described in detail above, according to the present invention, when the vehicle is at a standstill, a solenoid valve having a function capable of continuously maintaining the brake pressure for a predetermined time during which the brake pedal is depressed to the accelerator pedal is provided. Even clutch vehicles can be started easily on slopes without operating the side brakes.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a vehicle braking device as an embodiment according to the present invention.

FIG. 2 is a control circuit diagram of a solenoid valve in a vehicle braking device.

[Explanation of symbols]

 1 Brake Pedal 2 Master Cylinder 3 Brake Cylinder 4 Solenoid Valve 5 Brake Switch 6 Accelerator Switch 7 Speed Sensor 8 Time Delay 9 Inverter 10 AND Circuit

Claims (3)

[Scope of utility model registration request] 1. A vehicle braking system has a solenoid valve 4 for shutting off an oil passage in a pipe connecting a master cylinder 2 and a brake cylinder 3, and the solenoid valve 4 brakes when a vehicle is stopped. A vehicle braking device comprising a control circuit capable of continuously holding a brake pressure for a predetermined time during which the pedal is depressed to the accelerator pedal. 2. The control circuit outputs a brake switch 5 that outputs an ON signal when the brake pedal is depressed, an accelerator switch 6 that outputs an ON signal when the accelerator is depressed, and an ON signal when the vehicle is stopped. It has a function of controlling the solenoid valve 4 based on a signal from the output speed sensor 7 so that the brake pressure can be continuously maintained for a predetermined time during which the brake pedal is depressed to the accelerator pedal. The vehicle braking device according to claim 1. 3. The control circuit includes a brake switch 5 which outputs an ON signal when the brake pedal is depressed, an accelerator switch 6 which outputs an ON signal when the accelerator is depressed, and an ON switch when the vehicle is stopped. A speed sensor 7 for outputting a signal, a time delay 8 for outputting an ON signal of the brake pedal for a predetermined time during the stepping from the brake pedal to the accelerator pedal, and the time delay 8, the accelerator switch and the speed sensor 7 The vehicle braking device according to claim 1, further comprising an AND circuit 10 that controls an electromagnetic valve according to an output.