JPS6256815B2 - - 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 access 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 in order to solve the above-mentioned drawbacks, and includes an engine rotation speed detection means that integrates the engine rotation speed from the time of starting the engine, and the integrated engine rotation speed from the engine rotation speed detection means is A signal indicating that the set value has been reached or exceeded.
By activating the release means and releasing the parking brake based on a signal indicating that the parking brake is applied and a signal indicating that the accelerator pedal is depressed, the parking brake is automatically released when the engine is started. The purpose of the present invention is to provide a safe automatic parking brake release device for automobiles that prevents the vehicle from starting without permission.

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 on 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, when the switch is in the P (parking) or N (neutral) range.
OFF, in the case of a manual transmission vehicle, it is OFF when the gear is in a position other than the N range, and even if voltage V _B is applied to the ST terminal by operating the ignition switch 2, the voltage V is applied to the starter coil 7 except in the N or P range. _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. Reference numeral 9 denotes an external resistor of the ignition coil 10, which, together with the distributor 11 and the spark plug 12, is a component of the engine ignition system.

Reference numeral 20 denotes an engine rotation speed detection circuit which is a main part of the engine rotation speed detection means, and inputs a signal from the connection point between the ignition coil 10 and the external resistor 9 to a terminal 20a, and the contact point of the distributor 11 is input to the terminal 20a. The voltage drop waveform generated by the external resistor 9 when closed is shaped using a diode, a resistor, a transistor, and a capacitor, and is counted by a counting circuit 22 via a shaping gate 21. When the integrated value of the number exceeds the set value), the QN terminal of the counting circuit 22 becomes level "1", and counting is stopped and held. This signal is generated at terminal 20b via shaping gates 23 and 24.

In addition, 25 is a power supply reset signal generation circuit with a resistor.
It is composed of a capacitor, a diode, and a shaping gate 251, and the ignition switch 2
Each time the voltage V _B is applied to the IG terminal, a "1" level pulse signal is generated, the counting circuit 22 is reset, and the QN terminal is set to the "0" level. 26 is a known constant voltage power supply circuit. The shaping gates 21, 23, 251 and the counting circuit 22 are all manufactured by well-known Tokyo Shibaura Electric Co., Ltd.
ICTC4093 and TC4020 are used. 30 is a control circuit forming the main part of the release means, and terminals 30b, 30
It logically processes the signals inputted to c and 30d and outputs a signal for driving the actuator 6 to the terminal 30a. Terminal 30c is of ignition switch 2.
When the voltage V _B is applied to the ST terminal, that is, when the starter is activated, the voltage V _B is applied, but if the shift position detection switch 5 is ON in a case other than the above, it is grounded via the starter solenoid 7. has been done. A parking brake operation detection switch 3 and an accelerator pedal operation detection switch 4 are connected in series to the terminal 30d, and are in an open state when the accelerator pedal is not depressed, and when the parking brake is locked and the accelerator pedal is depressed. Sometimes grounded.

In other words, operate ignition switch 2
When voltage V _B is applied to the IG terminal and the cumulative value of engine rotation speed reaches the set value (for example, 2000 rotations), terminal 2
0b becomes the "1" level. 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 30c is in the open state, and the parking brake is in the locked state, and the parking brake operation detection switch 3 is in the locked state.
turns on, the accelerator pedal is depressed, the accelerator pedal operation detection switch 4 turns on, and the terminal 30d becomes grounded.
1 turns on. When the transistor 301 is turned on, its collector terminal becomes the terminal 30d which is almost grounded.
Therefore, the transistor 304 is turned on and a voltage is applied to the output terminal 30e. Therefore, the actuator 6 is operated and the parking brake release knob is operated, and 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, and the terminal 30d changes from the grounded state to the same potential as the IG terminal of the ignition switch 2, so both transistors 301 and 304 turn OFF.
However, the actuator 6 ceases to operate. In addition,
305 is a noise prevention diode for 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 becomes the inlet of the engine's intake negative pressure, and 66 is a pipe 65
This is a rubber contact rubber for sealing 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 core center of a magnetic material that serves as a path for magnetic flux generated from the coil 67;
69 is a magnetic L type core, 70 is a coil 7
This is a moving core made of magnetic material that moves by the magnetic flux generated from the core and switches between engine intake negative pressure and atmospheric pressure using a contact rubber 66 provided at the tip.

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 transmission is in a range other than P or N. 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 30c 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 cumulative value of the engine rotation speed since engine startup is equal to or higher than a set value by the engine rotation speed detection means, and a signal indicating that the parking brake is applied by the parking brake operation detection means. Based on the signal indicating that the accelerator pedal is depressed and the signal indicating that the accelerator pedal is depressed from the accelerator pedal operation detection means, the release means is actuated to release the parking brake, so that the parking brake is activated when the engine is started. Even if you press the accelerator pedal while the parking brake is applied, the parking brake will not be automatically released, which prevents the car from moving on its own on slopes, etc., and immediately after the cumulative engine speed reaches the set value when starting the vehicle. This has the excellent effect of automatically releasing the parking brake and reducing the burden on the driver.

[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, 30... Actuator and control circuit forming main parts of release means, 20... Engine The engine speed detection circuit is the main part of the rotation speed detection means.

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, an engine rotation speed detection means is provided that integrates the engine rotation speed since the engine is started, and when the engine rotation speed accumulated by the engine rotation speed detection means is equal to or higher than a set value. The parking brake is released by the release means based on a signal indicating that the parking brake has been reached, a signal indicating that the parking brake is applied, and a signal indicating that the accelerator pedal is being depressed. Automatic parking brake release device for automobiles.