JPS6256017B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic parking brake release device that automatically releases the parking brake of an automobile when the vehicle is started.

Conventional parking brake automatic release devices
Detecting whether the parking brake is applied and also detecting whether the accelerator pedal is depressed, and operating a release means for releasing the parking brake when the parking brake is applied and the accelerator pedal is depressed; The parking brake was released.

However, in the above configuration, when the engine is started and the parking brake is applied to prevent the vehicle from moving onto a road surface such as a slope,
When the accelerator pedal was pressed to start the engine, the parking brake was released, causing the car to move on its own, which was dangerous.

The present invention has been made to solve the above-mentioned drawbacks,
A mileage detection means is attached to detect the distance traveled since departure, and a signal indicating that the vehicle has traveled a certain distance from the distance detection means, a signal indicating that the parking brake is applied, and a signal indicating that the accelerator pedal is depressed are provided. By activating the release means and releasing the parking brake based on a signal indicating that the parking brake is turned on, the parking brake is not automatically released when the engine is started, and the car does not start automatically. The purpose is to provide an automatic parking brake release device.

An embodiment of the present invention shown in the drawings will be described below. FIG. 1 is its electrical circuit diagram, and its configuration and operation will be explained below. 1 is an in-vehicle battery with voltage V _B ,
2 is the ignition switch, Acc is the accessory, IG is the ignition, and ST is the starter. 3 is a parking brake operation detection switch that is turned on (closed) when the parking brake is applied (hereinafter referred to as the locked state), and serves as a parking brake operation detection means. When the parking brake is in the locked state, the lamp 8 in the meter panel lights up. Light. Reference numeral 4 designates an accelerator pedal operation detection switch that is turned off when the accelerator pedal is depressed. 5 is a shift position detection switch that detects the shift position of the transmission, and in the case of automatic transmission vehicles, it is OFF when the range is not P (parking) or N (neutral).
In the case of a manual transmission vehicle, the ignition switch is turned OFF when in a range other than N, and even if voltage V _B is applied to the ST terminal by operating ignition switch 2, voltage V is applied to starter coil 7 in ranges other than N or P.
_B cannot be applied. Reference numeral 6 designates an actuator driven by the engine's intake negative pressure, which is the main part of the parking brake release means, and is activated when voltage is applied to release the parking brake.

20 is a mileage detection circuit, which together with the mileage sensor 30 constitutes mileage detection means. The mileage detection circuit 20 receives a pulse signal from the mileage sensor 30, which is composed of a magnet 31 attached to a speedometer cable and a reed switch 32, and sends it to a counting circuit 23 via a resistor, a capacitor, a diode, and a shaping gate 21. When the pulse count exceeds a certain value (that is, the distance traveled is a certain value), the
_Q4 terminal becomes “1” level and counting is stopped and held. This signal is passed through a shaping gate 24 to terminal 2.
Occurs at 0b. Reference numeral 22 denotes a power supply reset signal generation circuit, which is composed of a resistor, a capacitor, a diode, and a shaping gate 221, and generates a "1" level pulse signal every time the ignition switch 2 is operated and a voltage is applied to the IG terminal. is generated, the counting circuit 23 is reset, and the _Q4 terminal is reset to the "0" level. Incidentally, the counting circuit 23 and the shaping gates 21, 24, and 221 all use well-known ICs TC4520 and TC4093 manufactured by Tokyo Shibaura Electric Co., Ltd. Reference numeral 10 denotes a control circuit which constitutes the main part of the canceling means, and logically processes the signals inputted to the terminals 10b, 10c, 10d, and 10g and outputs the processed signals to the terminal 10f. The transistor 101 operates the ignition switch 2 to apply a voltage to the IG terminal, and when the transistor 101 travels a certain distance, the driving distance detection circuit 2 is activated.
It turns OFF only when the terminal 20b of 0, that is, the terminal 10G of the control circuit 10 changes from the "1" level to the "0" level. A voltage is applied to the terminal 10b when a voltage is applied to the ST terminal of the ignition switch 2, that is, when the starter is activated, but when the shift position detection switch 5 is turned on in other cases than the above.
If so, it is grounded via the starter solenoid 7. Voltage is applied to the IG terminal of the ignition switch 2, and the terminal 10d
If the parking brake operation detection switch 3 is turned on when a voltage is applied to a, it is grounded. When the accelerator pedal operation detection switch 4 depresses the accelerator pedal, the terminal 10c is turned off and changes from the grounded state to the open state.

In other words, operate ignition switch 2.
When a voltage is applied to the IG terminal and the vehicle travels a certain distance, the terminal 10g goes to the "0" level and the transistor 101 turns off. At this time, the shift position is in a position other than the P or N range, the shift position detection switch 5 is turned OFF, the terminal 10b is opened, the parking brake is locked, and the parking brake operation detection switch 3 is turned OFF.
ON, the terminal 10d is grounded, and when the accelerator pedal is depressed and the accelerator pedal operation detection switch 4 is turned OFF and the terminal 10c is in the open state, the terminals 10b and 10c are connected to the diode 10.
A voltage is applied via a resistor 102 to the collector terminal of the transistor 101 connected via the transistor 3 and 104, and this voltage is applied via a diode 105 to the base of the transistor 106.
Then, since the collector terminal of the transistor 106 has almost the potential of the grounded terminal 10d, the transistor 107 is turned on and a voltage is applied to the output terminal 10f. Therefore, the actuator 6 is activated and the parking brake release knob is operated.
The parking brake is automatically released from the locked state. When the parking brake is automatically released, the parking brake operation detection switch 3 turns OFF.
Since the terminal 10d is no longer grounded, both transistors 106 and 107 are turned off, and the actuator 6 is no longer operated. Note that 108 is a noise prevention diode of the actuator 6.

Next, the actuator 6 will be explained in detail. FIG. 2 shows a sectional view of the actuator 6, in which 61 is a housing, 62 is a cover, and 63 is a housing.
64 is a center shaft attached to the parking brake release knob, and 64 is a bellows to which the center shaft 63 is attached. 65 is a pipe that serves as an inlet for the intake negative pressure of the engine, and 66 is a pipe 6.
This is a contact rubber made of rubber for closing the hole at one end of the housing 61 (introducing engine intake negative pressure) and the hole in the housing 61 (introducing atmospheric pressure). 67 is a coil, 68 is a magnetic core center which is a path for the magnetic flux generated from the coil 67, 69 is a magnetic L type core, 70 is moved by the magnetic flux generated from the coil 7, and the contact rubber 66 provided at the tip moves the engine. A moving core made of magnetic material that switches between negative intake pressure and atmospheric pressure.

This actuator 6 operates as follows.
When the coil 67 is energized, a magnetic flux is generated, and this magnetic flux tends to form a closed circuit of the core center 68, L type core 69, moving core 70, and core center 68, so that the moving core 70 moves in the direction of the core center 68. As a result, the contact rubber 66 is separated from the tip of the pipe 65 and the housing 6
Close hole 1. At this time, the engine intake negative pressure that has been input to the pipe 65 enters the inside of the bellows 64 through the hole 71. Therefore, the bellows 64 contracts, and at the same time, the center shaft 63 moves in the direction of the arrow and operates the parking brake release knob to release the parking brake. Note that when the coil 67 is not energized, the contact rubber 66 closes the hole at the tip of the pipe 65, and atmospheric pressure is introduced into the bellows 64 (that is, after the parking brake is released, the parking brake is newly applied). (remains deactivated until applied).

In the above embodiment, the shift position of the transmission is detected by the shift position detection switch 5, and the parking brake is released only when other release conditions are met when the shift position is not in the P or N range. The detection switch 5 may be removed, the starter coil 7 may be connected directly to the ST terminal of the ignition switch 2, and at the same time the terminal 10b may be kept open.

Furthermore, in the above embodiment, an actuator that utilizes the engine's intake negative pressure is used as the actuator 6 for releasing the parking brake, but an actuator such as an electromagnet that utilizes electromagnetic energy may also be used.

As explained in detail above, the present invention provides a signal indicating that the vehicle has traveled a certain distance from the time of departure from the mileage detection means, a signal indicating that the parking brake is applied from the parking brake operation detection means, and a signal indicating that the parking brake has been applied from the parking brake operation detection means. By activating the detection means and releasing the parking brake based on a signal from the pedal operation detection means indicating that the accelerator pedal is being depressed, the accelerator pedal can be pressed while the parking brake is applied when starting the engine. The parking brake is not automatically released even when the driver is depressed, preventing the car from moving on its own on slopes, etc., and after driving the specified distance, the parking brake is automatically released immediately upon departure, reducing the burden on the driver. has.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing an embodiment of the present invention;
FIG. 2 is a cross-sectional configuration diagram of the actuator in FIG. 1. 3... Parking brake operation detection switch forming parking brake operation detection means, 4... Accelerator pedal operation detection switch forming accelerator pedal operation detection means, 6, 10... Actuator and control circuit forming main parts of release means, 20, 30... A mileage detection circuit that forms the main part of the mileage detection means;
Odometer sensor.

Claims (1)

[Claims] 1. A release means that releases the parking brake based on a signal from a parking brake operation detection means that detects that the parking brake is applied and a signal from an accelerator pedal operation detection means that detects that the accelerator pedal is depressed. In the automatic parking brake release device for automobiles, a driving distance detecting means for detecting the traveling distance from the time of departure is provided, and a signal indicating that the vehicle has traveled a certain distance from the driving distance detecting means;
An automatic parking brake release device for an automobile, characterized in that the parking brake is released by the release means based on a signal indicating that the parking brake is applied and a signal indicating that the accelerator pedal is depressed. .