KR20020040340A - Brake method of vehicle - Google Patents

Abstract

PURPOSE: A braking method of a vehicle is provided to cut down expenses by reducing wear of a brake pad, and to improve stability and driving experience by increasing the endurance of an auxiliary brake. CONSTITUTION: A pressure detecting sensor(6) installed in a brake line(3) detects hydraulic or pneumatic pressures flowing through the brake line according to operation of a brake pedal(1), and outputs with converting pressure into voltage. An ECU(Electronic Control Unit)(9) receives electric signals from the pressure detecting sensor, an engine RPM(Revolution Per Minute) sensor(7) and a hand lever switch(8), and detects operation of the brake pedal and the hand lever switch and engine RPM. A main brake actuator(5) and an auxiliary brake actuator(12) are operated selectively with the ECU, and braking force is generated with a main brake(4) or an auxiliary brake(11). The auxiliary brake is operated according to engine RPM, and braking force is generated corresponding to voltage of the pressure detecting sensor and intermittence of the hand lever switch. Expenses are reduced with preventing wear of the brake pad, and stability is improved with increasing the endurance of the auxiliary brake.

Description

Braking method of car {BRAKE METHOD OF VEHICLE}

The present invention relates to a braking method of a vehicle, and more particularly, to a braking method of a vehicle so that the auxiliary brake is operated in conjunction with the operation of the foot brake.

In general, automobiles are equipped with a brake device for controlling the speed of the vehicle when driving. Such brake devices include a hydraulic brake, a brake pedal, a brake master cylinder, an oil tank, a brake oil distributor, and a wheel cylinder. It consists of.

Therefore, when the driver presses the brake, the force applied to the brake pedal is applied to the brake master cylinder, and the force is converted into hydraulic pressure, which is applied to the brake wheel cylinders of each wheel through the brake oil distributor, thereby generating a braking force. When the driver releases the brake pedal, the braking force is released while returning to the initial state by the elastic restoring force of the return spring installed in the brake master cylinder.

On the other hand, a general commercial vehicle is provided with a secondary brake device that is operated separately from the main brake bar, as the auxiliary brake device is mainly used, such as a retarder, exhaust brake.

Here, the retarder is a kind of auxiliary brake, which is installed or embedded in the power transmission system such as the middle of the propulsion shaft or the rear part of the transmission, and is operated by the operation of the hand lever switch, and the type is operated by the rotation of the conductor. An electric retarder that uses the phenomenon that the rotational speed of the conductor is reduced by the eddy current flow, and a rotor and stator installed in the automatic transmission, and a fluid type ritata that operates on the principle of increasing the rotational resistance of the rotor by increasing the hydraulic or air pressure in the housing. There is more.

In the case of the exhaust pipe, the exhaust stroke pressure of the vehicle is increased by installing a rotatable disc valve at the exhaust port of the engine to close the exhaust pipe so as to obtain the effect of the engine brake.

However, since both the main brake and the auxiliary brake are configured to operate separately, there is a problem in that the safety of the vehicle is reduced because the auxiliary brake cannot be effectively used in an emergency situation.

Accordingly, a braking device is provided in which the main brake and the auxiliary brake are operated at the same time when the foot brake is operated, so that the auxiliary brake can be effectively used during braking. However, the braking device works together with the auxiliary brake whenever the main brake is operated. As a result, the brake pads wear out quickly, resulting in economic losses, and thus, the durability of the auxiliary brakes is reduced, thereby lowering safety.

In addition, irrespective of the force applied to the brake pedal, the auxiliary brake always exerts the maximum braking force so that the vehicle body has a roaring motion during braking, and thus, the passenger's riding comfort worsens.

Therefore, the present invention is devised to solve all the problems described above, the auxiliary brake is not operated even if the main brake is operated when the engine rotation speed is less than 1000rpm, the auxiliary brake is operated when the engine brake speed is more than 1000rpm In addition to operating the brakes in conjunction with, the braking force of the auxiliary brake is operated in proportion to the braking force of the main brake, thereby reducing the wear rate of the brake pad to improve the economics, improve the durability of the auxiliary brake to improve the safety of the vehicle, It is an object of the present invention to provide a braking method of a vehicle in which a vehicle's riding comfort is improved by eliminating the roaring movement of the vehicle body during braking.

The present invention for achieving the above object, the step of outputting by converting the pressure in the form of voltage while the pressure sensor installed on the brake line detects the hydraulic pressure or pneumatic flowing through the brake line in accordance with the operation of the brake pedal And, the electronic control unit receives the electric signal output from the pressure sensor and the engine RPM sensor and the electric signal of the hand lever switch to determine the operation of the brake pedal and the hand lever switch and the rotational speed of the engine, The main brake actuator and the auxiliary brake actuator are selectively operated by the electronic control unit to generate only the braking force by the main brake or simultaneously generate the braking force by the main brake and the braking force by the auxiliary brake.

1 is a schematic circuit diagram illustrating a braking method according to the present invention;

2 is a flowchart illustrating a braking method according to the present invention.

<Description of Symbols for Main Parts of Drawings>

1-Brake Pedal 2-Brake Master Cylinder

3-Breakline 4-Main brake

5-Main brake actuator 6-Pressure sensor

7-Engine RPM Sensor 8-Hand Lever Switch

9-electronic control unit (ECU) 11-auxiliary brake

12-auxiliary brake actuator

DETAILED DESCRIPTION Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic circuit diagram for explaining a braking method according to the present invention, Figure 2 is a flow chart for explaining a braking method according to the present invention, the apparatus used to execute the braking method according to the present invention, The brake pedal 1 that the driver steps on to operate the main brake, the brake master cylinder 2 for converting the pedal force of the brake pedal 1 into hydraulic or pneumatic pressure, and the brake master cylinder 2 And a main brake actuator 5 connected to and via a brake line 3 and controlled by an electronic control unit 9 (ECU), which will be described later, to be driven to selectively operate the main brake 4; 3) is installed on the pressure sensing to detect the hydraulic pressure or pneumatic flowing through the brake line (3) in accordance with the pedal pedal (1) to convert the form of voltage (Volt) and output The sensor 6 and the electric signal output from the pressure sensor 6 and the rotational speed of the engine received from the engine RPM sensor 7 and the electric signal received according to the connection terminal of the hand lever switch 8 are compared. Analyzed by the electronic control unit 9 (ECU) and the electronic control unit 9 (ECU) to analyze and determine whether the brake pedal 1 and the hand lever switch 8 are operated and the rotational speed of the engine. It consists of an auxiliary brake actuator 12 adapted to be driven to selectively operate the auxiliary brake 11.

The electronic control unit 9 (ECU) has a structure for controlling the relay 14 for selectively blinking the braking lamp 13 during the operation of the main brake 4 and the auxiliary brake 1.

Hereinafter, a braking method using the main brake 4 and the auxiliary brake 11 according to the present invention will be described in detail with reference to FIGS. 1 and 2.

First, when the driver presses the brake pedal 1, the pedal force of the brake pedal 1 is transmitted to the brake master cylinder 2, and the force is changed into hydraulic or pneumatic pressure through the brake line 3 Will be moved.

At this time, the hydraulic pressure or pneumatic pressure moved through the brake line 3 is detected by the pressure sensor 6, the pressure sensor 6 converts the hydraulic pressure or pneumatic pressure in the form of voltage (Volt) Output is made to the electronic control unit 9 (ECU).

In addition, the electronic control unit 9 (ECU) compares and analyzes the electric signal received from the pressure sensor 6 and the electric signal received from the engine RPM sensor 7 and the electric signal received from the hand lever switch 8. On the basis of this result, the main brake actuator 5 and the auxiliary brake actuator 12 are selectively operated to simultaneously generate the braking force by the main brake 4 and the braking force by the auxiliary brake 11, or Only the braking force by the brake 12 is generated.

That is, the electronic control unit 9 (ECU) determines the rotation speed of the engine received from the engine RPM sensor 7 (step 21), and the rotation speed of the engine is increased by the electronic control unit 9 (ECU). When it is determined to be 1000 RPM or less, even if pressure is generated in the brake line 3 and the hand lever switch 8 is operated, the electronic control unit 9 (ECU) drives only the main brake actuator 5 to operate the main brake 4. Only the braking force is generated.

When the engine rotation speed is determined to be 1000 RPM or more by the electronic control unit 9 (ECU), it is determined whether the hand lever switch 8 is operated (step 22), and the electronic control unit 9; When the brake pedal 1 is operated by the ECU and the pressure is generated in the brake line 3 and it is determined that the hand lever switch 8 is operated, the electronic control unit 9 (ECU) is connected to the main brake actuator (ECU). 5) by driving the auxiliary brake actuator 12 to generate a braking force by the main brake (4) while generating a braking force by the main brake (4) to generate a braking force by the auxiliary brake (11). It will be generated at the same time.

That is, when the operating end of the hand lever switch 8 is determined to be the first stage by the electronic control unit 9 (ECU) (step 31), the auxiliary brake 11 controls the electronic control unit 9 (ECU). By generating a braking force proportional to the operation stage of the first stage, the brake light 13 is also turned on accordingly.

In addition, when the operation stages of the hand lever switch 8 are determined to be 2 to 4 stages by the electronic control unit 9 (ECU) (steps 32, 33, 34), the auxiliary brakes 11 also have 2 to 4 stages. Braking force is generated, which is proportional to the operating stage of the stage, respectively, and the braking lamps 13 are turned on.

When the brake pedal 1 is operated by the electronic control unit 9 (ECU) to generate pressure in the brake line 3 and the hand lever switch 8 is not operated, the electronic control unit (9; ECU) drives the main brake actuator (5) to generate a braking force by the main brake (4) while generating a braking force proportional to the voltage (volt) of the pressure sensing sensor (6). ) To generate the braking force by the auxiliary brake (11) at the same time.

That is, when the voltage volt of the pressure sensor 6 is determined to be less than 1V by the electronic control unit 9 (ECU) (step 41), the auxiliary brake 11 is the electronic control unit 9 (ECU). By the control of the control unit generates a braking force of one stage proportional to the voltage of less than 1V, the brake lamp 13 is also turned on accordingly.

Further, when the voltage volts of the pressure sensor 6 are determined to be 1V to 2V, 2V to 3V, and 3V to 4V by the electronic control unit 9 (ECU) (steps 42, 43, 44), The auxiliary brakes 11 also generate braking force of two stages, three stages, and four stages, which are proportional to 1V to 2V, 2V to 3V, and 3V to 4V, respectively, and the braking lamps 13 are turned on.

On the other hand, if the rotation speed of the engine is more than 1000 RPM by the electronic control unit 9 (ECU) and the brake pedal 1 and the hand lever switch 8 are operated simultaneously, the braking force of the auxiliary brake 11 is the hand lever. A braking force is generated which is proportional to the interruptions (steps 1 to 4) of the switch 8.

That is, when the brake pedal 1 is operated so that the voltage volt of the pressure sensor 6 is less than 1 V, the auxiliary brake 11 generates a braking force of one stage, and the hand lever switch 8 When the operating stage is operated in three stages, the auxiliary brake 11 generates the braking force in three stages. The first stage operation by the brake pedal 1 and the three stage operation by the hand lever switch 8 simultaneously When generated, the braking force of the auxiliary brake 11 generates three stages of braking force by the control of the electronic control unit 9 (ECU).

Therefore, when the vehicle is braked according to the present invention, when the engine speed is 1000 RPM or less, the auxiliary brakes 11 are not operated, thereby reducing the wear rate of the brake pads, thereby improving economic efficiency.

In addition, since the auxiliary brake 11 generates a braking force that is proportional to the voltage of the pressure sensor 6 and the interruption of the hand lever switch 8, the durability of the auxiliary brake 11 is improved. The safety of the will be enhanced, thereby eliminating the roaring movement of the vehicle body during braking will improve the ride comfort of the occupants.

As described above, according to the present invention, the auxiliary brake generates a braking force proportional to the voltage of the pressure sensor for detecting the brake line and the interruption of the hand lever switch while the operation of the auxiliary brake is determined by the engine speed. As the wear rate is reduced, the economical efficiency is improved, as well as the durability of the auxiliary brake is improved, not only to improve the safety of the vehicle but also to improve the ride comfort of the passenger, thereby improving the merchandise.

Claims (5)

The pressure sensor 6 installed on the brake line 3 detects the hydraulic pressure or pneumatic pressure flowing through the brake line 3 according to the operation of the brake pedal 1, and converts the pressure into a voltage in the form of a voltage. And the electronic control unit 9 (ECU) receives the electric signal output from the pressure sensing sensor 6 and the electric signals of the engine RPM sensor 7 and the hand lever switch 8. And determining whether the hand lever switch 8 is operated and the rotational speed of the engine, and the main brake actuator 5 and the auxiliary brake actuator 12 are selectively operated by the electronic control unit 9 (ECU). A method of braking a motor vehicle, characterized in that it generates only a braking force by the main brake (4) or simultaneously generates a braking force by the main brake (4) and a braking force by the auxiliary brake (11). 2. The engine according to claim 1, wherein if the rotational speed of the engine is determined to be 1000 RPM or less by the electronic control unit 9 (ECU), the pressure is generated in the brake line 3 and the hand lever switch 8 is operated. A braking method for a vehicle, characterized in that the electronic control unit (9; ECU) drives only the main brake actuator (5) to generate only the braking force by the main brake (4). 2. The engine according to claim 1, wherein pressure is generated in the brake line (3) and the hand lever switch (8) is operated while the engine rotation speed is determined to be 1000 RPM or more by the electronic control unit (ECU). When the electronic control unit 9 (ECU) drives the main brake actuator 5 to generate a braking force by the main brake 4, the auxiliary brake generates a braking force proportional to the interruption of the hand lever switch 8. A method of braking a motor vehicle, characterized in that for driving the actuator (12) to simultaneously generate a braking force by the auxiliary brake (11). 2. The hand lever switch (8) according to claim 1, wherein the electronic control unit (9; ECU) determines that the rotation speed of the engine is 1000 RPM or more and that pressure is generated in the brake line (3). If it is determined that the electronic control unit 9 (ECU) drives the main brake actuator 5 to generate a braking force by the main brake 4, the braking force is proportional to the voltage of the pressure sensor 6. The braking method of a vehicle, characterized in that to generate the braking force by the auxiliary brake (11) at the same time by driving the auxiliary brake actuator (12) to be generated. The auxiliary brake (11) of claim 1, wherein the engine brake speed is 1000 RPM or more and the brake pedal (1) is operated to generate pressure in the brake line (3) while the hand lever switch (8) is operated at the same time. The braking method of the vehicle, characterized in that generated by the braking force proportional to the interruption of the hand lever switch (8).