KR100666141B1 - Electronic control brake system for automobile with pressure sensor for automobile - Google Patents

Abstract

The present invention relates to an electronically controlled brake system for a vehicle equipped with a pressure sensor, and an object thereof is to easily connect a pressure sensor for detecting brake hydraulic pressure generated in a master cylinder to a circuit board to further improve product assembly workability. will be.

According to the electronically controlled brake system for a vehicle having a pressure sensor according to the present invention, the pressure sensor 80 is mounted directly on the side of the hydraulic block 60 so that the total length of the master cylinder 12 is not long, and thus the master cylinder 12 ) Can be shared with each brake system to reduce the manufacturing cost of the electronically controlled brake system. In addition, after assembling the electronic control device 70 and the hydraulic block 60 by applying heat outside the housing 71 of the electronic control device 70 by connecting the pressure sensor 80 to the circuit board 72 firmly. Without the need for a separate connection member such as a wire connector, the pressure sensor 80 is easily and stably connected, thereby improving the assembly workability.

Description

Electronic control brake system for automobile with pressure sensor {Electronic control brake system for automobile with pressure sensor for automobile}

1 is a hydraulic system showing an electronically controlled brake system for a vehicle to which the present invention is applied.

2 is a block diagram of an electronic brake system for a vehicle according to the present invention.

Figure 3 shows the assembly structure of the hydraulic block and the electronic control device of the electronic brake system for a vehicle according to the present invention.

4 and 5 show the connection structure of the pressure sensor according to the present invention.

* Explanation of symbols for main parts of drawings *

60. Hydraulic block 70. Electronic control unit

71. Housing 72. Circuit board

80. Pressure sensor 83. Connecting terminal

90.lead wire 91.solder

92. Heating element 92a.

The present invention relates to an electronically controlled brake system for a vehicle, and more particularly, to an electronically controlled brake system for a vehicle having a pressure sensor for detecting a brake hydraulic pressure generated on the master cylinder side by the pedal pedal effort.

In general, the vehicle is equipped with a wheel brake for braking the front and rear wheels for the purpose of deceleration or stopping while driving, and a booster and a master cylinder for forming the braking hydraulic pressure and transmitting it to the wheel brake side. The hydraulic pressure generated at is transferred to the wheel brake to generate a braking force. However, when the driver presses the brake pedal to control the increase / sustainment of the braking force, if the braking pressure is greater than the road surface state or the friction force of the wheel brake generated by the braking pressure is greater than the braking force generated from the tire or the road surface, the tire is A slipping phenomenon occurs.

Therefore, in recent years, various brake systems have been developed to efficiently control slip phenomena, to exhibit strong and stable braking force, and to make driving easier. This is an anti-lock brake system (ABS: Anti) that prevents wheel slip during braking. -Lock Brake System, and Brake Traction Control System (BTCS) to prevent excessive slip of the driving wheel during rapid start or acceleration of vehicle. In addition, when the vehicle is not adjusted according to the driver's will by the force applied from the outside during the high speed driving of the vehicle, the vehicle that can stably maintain the driving state by controlling the brake hydraulic pressure by combining the anti-lock brake system and the traction control An electronically controlled brake system for a vehicle with a vehicle dynamic control system (VDC) function is disclosed.

An electronically controlled brake system for a vehicle that functions as described above includes a hydraulic unit equipped with a plurality of solenoid valves, low pressure accumulators, and high pressure accumulators for regulating braking hydraulic pressure delivered to the wheel brake side, and an electrically operated component. It is equipped with an electronic control unit (ECU) for controlling.

The solenoid valve is divided into a NO type solenoid valve disposed upstream of the wheel brake and an NC type solenoid valve disposed downstream, and controlled by an electronic controller. That is, the electronic controller detects the vehicle speed through each wheel sensor disposed at the front wheel and the rear wheel, thereby controlling the opening and closing operation of each solenoid valve. In addition, the low pressure accumulator is independently provided on the downstream side of the NC type solenoid valve so that the oil escaping from the wheel brake side can be temporarily stored in the decompression mode. do.

In addition, the hydraulic block includes a solenoid valve, a low pressure and high pressure accumulator, a medium pressure accumulator for accumulating brake fluid, a motor, a pump for forcibly pumping oil stored in the low pressure accumulator, and a brake hydraulic pressure discharged from the pump to the pump suction side. A flow path and the like for passing are provided. Since the medium pressure accumulator is disposed in the bypass flow path, the brake fluid discharged from the pump is accumulated and supplied to the pump side during the vehicle attitude control operation.

On the other hand, the master cylinder has a pressure sensor for detecting the brake hydraulic pressure generated by the driver's brake pedal pedal force delivered to the hydraulic block side, and transmitting this as an electrical signal to the electronic control device. Accordingly, the electronic controller controls the additional operation of the pump and the opening / closing operation of each NC / NO solenoid valve based on the signal transmitted from the pressure sensor.

The conventional pressure sensor that performs this function is directly connected to extend in the axial direction to the front end of the master cylinder, it is electrically connected to the circuit board of the electronic control device through a separate wire connector.

Therefore, in the conventional vehicle electronically controlled brake system, the total length of the master cylinder becomes longer due to the pressure sensor, and the pressure sensor and the electronic control device are electrically connected through a wire connector, so that the installation thereof is difficult.

In addition, since master cylinders that are applied to anti-lock brake systems, brake traction systems, and vehicle attitude control systems are manufactured separately, pressure sensors are attached to them, so that parts of the master cylinders cannot be shared, and therefore, electronically controlled brake systems for vehicles. There is a problem that the overall manufacturing cost of the rise.

The present invention is to solve this problem, an object of the present invention is to prevent the length of the master cylinder is lengthened by placing a pressure sensor on the hydraulic block side for detecting the brake hydraulic pressure generated in the master cylinder delivered to the hydraulic block side. In addition, the present invention provides an electronically controlled brake system for a vehicle equipped with a pressure sensor that enables the master cylinder to be shared with each brake hydraulic control system.

Another object of the present invention is to provide an electronically controlled brake system for a vehicle having a pressure sensor which can improve the connection structure of a circuit board and a pressure sensor of the electronic control device and make them easily and stably electrically connected.

The present invention for achieving this object is;

A hydraulic block is built in the master cylinder, and a hydraulic block with a built-in pump for sending brake fluid to the wheel brake side and a plurality of solenoid valves for controlling brake hydraulic pressure sent to the wheel brake side, and assembled with the hydraulic block, is provided with a solenoid valve and a pump. An electronically controlled brake system for a vehicle having an electronic control device having a housing in which a circuit board is embedded to control the driving of a vehicle, and a pressure sensor connected to the circuit board of the electronic control device and sensing a brake hydraulic pressure formed in the master cylinder.

The pressure sensor is provided with a connecting terminal mounted on the hydraulic block and connected to the circuit board so as to communicate with the flow path for the brake hydraulic pressure generated in the master cylinder,

When assembling the housing of the electronic control device and the hydraulic block, one end is connected to the circuit board at one end of the connecting terminal and the corresponding housing, and the other end is connected to the lead terminal through the connecting terminal and solder, and the other end is in contact with the lead wire, The heat transfer member exposed to the insert is inserted, and heat is applied to the heat transfer member from the outside of the housing to melt the solder to connect the lead wire and the connecting terminal.

In addition, the heat transfer member is made of copper excellent in thermal conductivity, the other end of the heat transfer member is a configuration characterized in that the exposed portion is formed as a plate surface to facilitate the heat from the outside.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 is a schematic diagram showing a hydraulic system showing an electronically controlled brake system for a vehicle according to the present invention, and FIGS. 3 to 5 illustrate an assembly structure and a connection structure thereof of a pressure sensor according to the present invention.

1 and 2, an electronically controlled brake system for a vehicle according to the present invention includes a hydraulic block (60, HU; Hydraulic Unit) having a solenoid valve (20a) and a pump (41), and a solenoid valve ( 20A, 20B, and the electronic controller 70 (ECU) with a built-in circuit board 72 to electrically control the operation of the pump 41 and the like, the front wheel FR and the rear wheel of the vehicle ( RR) RL is provided with a wheel sensor 15 for sensing the wheel speed to transmit an electrical signal to the electronic control device (70).

The hydraulic block 60 is made of aluminum, which includes a plurality of solenoid valves 20a for regulating brake hydraulic pressure transmitted to the wheel brake 14 installed on the front wheel FR and the rear wheel RR RL. (20b), the low pressure accumulator (30) which temporarily stores the oil escaping from the wheel brake (14) during the decompression braking operation, and to pump the oil stored in the low pressure accumulator (30) during the boost and maintenance braking operation. A motor 40 for driving the pair of pumps 41, a high-pressure accumulator 31 directly connected to the discharge side of each pump 41, in order to reduce pressure pulsation of oil pressurized and discharged by driving the pump 41; A medium pressure accumulator 32 or the like in which the brake fluid discharged from the pump 41 is accumulated is compactly incorporated.                     

The plurality of solenoid valves 20a and 20b are connected to the upstream side and the downstream side of the wheel brake 14, and are normally open solenoid valves 20a (hereinafter, NO-type solenoids) disposed on the upstream side and kept open in a normal state. Valves), and normally closed solenoid valves 20b (hereinafter referred to as NC solenoid valves) which are arranged downstream and are normally kept closed. The opening and closing operations of the solenoid valves 20a and 20b are respectively controlled by the electronic controller 70 which detects the vehicle speed through the wheel sensor 15, and the NC-type solenoid valve 20b is controlled by the decompression braking action. The oil that is opened and exited from the wheel brake 14 side is temporarily stored in the low pressure accumulator 30.

The pair of pumps 41 are driven at the same time by a constant phase difference by the motor 40, thereby pressurizing and discharging oil stored in the low pressure accumulator 30 to the high pressure accumulator 31. The oil introduced into the high pressure accumulator 31 is transferred to the wheel brake 14 side along the hydraulic line again or returned to the master cylinder 12 while the pressure pulsation is reduced.

In addition, the hydraulic block 60 is provided with a master cylinder 12 having an oil storage tank 13 and a first flow passage 51 connecting the discharge side of the pump 41 to the NO-type solenoid valve 51a. Is additionally installed. The NO type solenoid valve 51a is normally maintained in an open state so that the brake hydraulic pressure generated in the booster 11 and the master cylinder 12 passes during normal braking through the brake pedal 10, and brake traction control. And it is closed by the electronic control device 70 during the vehicle attitude control operation.                     

In addition, a first relief valve 52a is installed in another second flow path 52 connecting between the discharge side of the pump 41 and the master cylinder 12, which is provided in the pump 41 during traction control or vehicle posture control. When the discharged brake fluid pressure rises more than necessary, the brake fluid is returned to the master cylinder 12 side. In addition, a third flow passage 53 connecting the master cylinder 12 and the pump 41 to the suction side thereof is provided, and an NO type electric shuttle valve 53a is additionally installed in the middle of the third flow passage 53.

In addition, a bypass flow passage 54 for bypassing the brake hydraulic pressure discharged from the pump 41 to the suction side thereof is provided, and a medium pressure accumulator 32 is provided in the bypass flow passage 54 to accumulate predetermined brake fluid. do. In addition, the NC-type solenoid valve which maintains the accumulated pressurized brake fluid on the downstream side of the medium pressure accumulator 32 and opens during brake traction control or vehicle control to communicate the suction side of the medium pressure accumulator 32 and the pump 41 ( 54b). In addition, a second relief valve 54a is provided on the upstream side of the medium pressure accumulator 32 to return the brake fluid pressure discharged from the pump 41 to a side of the medium pressure accumulator 32 when it rises above a predetermined pressure required for control. The first flow path 51, the second flow path 52, the third flow path 52, and the bypass flow path 54 are formed in the hydraulic block 60 through a drilling process.

In addition, the electronic control device 70 (ECU) is made of a plastic injection molding to form a housing 71 and a bottom surface of the housing 71, and is securely disposed on each solenoid valve 20a, 20b and the motor 40. And a circuit board 72 electrically connected to the back and controlling the driving thereof, and assembled to the hydraulic block 60 by mounting bolts.

On the other hand, the electronic control device 70 detects the brake hydraulic pressure generated in the master cylinder 12 through the pressure sensor 80, each of the solenoid valve 20a (20b) during the anti-lock control, traction control and vehicle attitude control operation Is programmed in the circuit board 72 so as to control the opening and closing operation of the motor 40 and the additional operation of the motor 40. The arrangement and connection structure of the pressure sensor 80 according to the present invention with reference to FIGS. When described as follows.

Referring to FIG. 3, the mounting port 61 is processed on one side of the hydraulic block 60 so that the pressure sensor 80 is mounted. The mounting port 61 is made by processing the side of the hydraulic block 60, and the bottom of the mounting port 61 is the hydraulic pressure of the brake hydraulic pressure generated in the master cylinder 12 by the brake pedal 10 pedal force. In communication with the first flow path 51 flowing into the (60) side. In addition, a female screw is processed on the inner circumference of the mounting port 61 so as to be engaged with the mounting portion 82 described later.

The pressure sensor 80 includes a body 81 through which the brake hydraulic pressure is transmitted to sense the pressure thereof, a mounting portion 82 provided at one end of the body 81 and coupled to the mounting port 61, and an electronic controller 70. ) Is defined as a connecting terminal 83 electrically connected thereto. The outer periphery of the mounting portion 82 is provided with a male screw through a tapping process so as to be coupled to the mounting port 61 in a bilateral manner, and a pressure transmission passage (not shown) is formed in the mounting portion 82 in the axial direction. In addition, the connecting terminal 83 extends in the axial direction on the upper end of the body 81 to be in contact with the lead wire 90 to be described later inserted into the bottom surface 71a of the housing 71 of the electronic control device 70.

4, the circuit board 72 is formed on the bottom surface 71a of the housing 71 corresponding to the connecting terminal 83 when the housing 71 of the electronic control device 70 and the hydraulic block 60 are assembled. A lead wire 90 extending from the contact with the connecting terminal 83 and a heat transfer member 92 for connecting the lead wire 90 and the connecting terminal 83 by applying heat from the outside of the housing 71. Is inserted. That is, one end of the lead wire 90 is connected to the circuit board 72, and the other end thereof is inserted into the bottom surface 71a of the housing 71 so as to extend toward the connecting terminal 83. A solder 91 having a low melting point is attached to the other end of the lead wire 90. This is for easily connecting the connecting terminal 83 and the lead wire 90 by being easily melted by heat transmitted from the outside. One end of the heat transfer member 92 is embedded in the bottom surface 71a of the housing 71 so as to contact the lead wire 90, and the other end thereof is exposed to the outside of the housing 71 so that heat can be applied thereto. At this time, the other end of the heat transfer member 92 is an exposed portion of the plate surface 92a so as to easily apply heat from the outside. This heat transfer member 92 is preferably made of copper, which is superior in thermal conductivity to other metals. In addition, the heat transfer member 92 and the lead wire 90 is preferably formed by inserting in the process of injection molding the housing 71 of the electronic control device 70 through a plastic material.

Next, the coupling process of the pressure sensor 80 configured as described above and the effects thereof will be described.

First, when the mounting portion 82 is coupled to the mounting port 61 of the hydraulic block 60 in a two-membered manner, the body 81 of the pressure sensor 80 is directly fastened to the side of the hydraulic block 60 and at the same time firstly. As the flow passage 51 and the pressure transfer passage 82b are linked to each other, the brake hydraulic pressure is transferred into the body 81 of the pressure sensor 80 to sense the pressure thereof.                     

Then, after pre-assembling the housing 71 of the electronic control device 70 to the hydraulic block 60 and tightening the mounting bolt, as shown in Figure 4, the hydraulic block 60 and the electronic control device 70 is firm. To be assembled. At this time, the solder 91 of the lead wire 90 embedded in the bottom surface 71a of the housing 71 and the connecting terminal 83 of the pressure sensor 80 come into contact with each other. That is, since the lead wire 90 and the connecting terminal 83 are disposed to correspond to each other, the solder 91 portion is connected to the connecting terminal 83 in the process of assembling the hydraulic block 60 and the electronic controller 70. You will come across.

Subsequently, in the state where the hydraulic block 60 and the electronic control device 70 are completely assembled, as shown in FIG. 5, heat is applied to the plate surface 92a of the heat transfer member 92 through welding means or an ultrasonic device. When heat is applied, heat is conducted to the lead wire 90 and the solder 91 through the heat transfer member 92, whereby the solder 91 is melted so that the lead wire 90 and the connecting terminal 83 are electrically connected. .

As described in detail above, according to the electronically controlled brake system for a vehicle equipped with a pressure sensor according to the present invention, the pressure sensor is mounted directly on the side of the hydraulic block does not lengthen the overall length of the master cylinder, thereby controlling the master cylinder for each brake The system can be shared to reduce the manufacturing cost of the electronically controlled brake system. In addition, after assembling the electronic control unit and the hydraulic block, the pressure sensor is firmly connected to the circuit board by applying heat from the outside of the housing of the electronic control unit, so that the pressure sensor can be easily and stably connected without a separate connection member such as a wire connector. This has the effect of improving the assembly workability of the more.

Claims (2)

A hydraulic block including a pump for sending brake fluid to the wheel brake side and a plurality of solenoid valves for controlling the brake hydraulic pressure sent to the wheel brake side via the brake hydraulic pressure formed in the master cylinder, and assembled with the hydraulic block, the solenoid An electronic control apparatus having an electronic control device having a housing having a circuit board embedded therein for controlling the operation of a valve and a pump, and a pressure sensor connected to the circuit board of the electronic control device and detecting a brake hydraulic pressure formed in the master cylinder. In the brake system, The pressure sensor 80 is mounted on the hydraulic block 60 so as to communicate with the flow passage 51 through which the brake hydraulic pressure generated in the master cylinder 12 is transferred, and a connecting terminal 83 connected to the circuit board 72. ), When the housing 71 of the electronic controller 70 and the hydraulic block 60 are assembled, one end of the circuit board 72 is formed at the bottom 71a of the housing 71 corresponding to the connecting terminal 83. The other end is connected to the lead wire 90 and the other end is in contact with the connecting terminal 83 and the solder 91, one end is in contact with the lead wire 90 and the other end is a heat transfer member exposed to the outside of the housing 71 ( 92) is inserted, The electronic control type for a vehicle having a pressure sensor, characterized in that to heat the heat transfer member 92 from the outside of the housing 71 to melt the solder 91 to connect the lead wire 90 and the connecting terminal 83. Brake system. The method of claim 1, The heat transfer member 92 is made of copper having excellent thermal conductivity, The other end of the heat transfer member (92) is an electronically controlled brake system for a vehicle with a pressure sensor, characterized in that the exposed portion is formed with a plate surface (92a) to facilitate the application of heat from the outside.

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