CN102785643B - With the faulty intelligent power-assisted braking arrangement dealing with function and parking brake function - Google Patents

Abstract

A kind of with the faulty intelligent power-assisted braking arrangement dealing with function and parking brake function.The present invention is a kind of intelligence power-assisted braking arrangement, and specifically, this intelligence power-assisted braking arrangement, retrains to brake the hydraulic pressure to being applied to braking clamp during engine breakdown when driver slams pedal.Therefore, even if the foot of human pilot fails after leaving pedal to step on again under crisis situation, the brake pressure of more than 0.3g is also had, in order to guarantee stability.

Description

Intelligent power-assisted braking device with fault handling function and parking brake function

technical field

The invention relates to a brake device of a vehicle, in particular to a brake device of electric power assist mode.

Background technique

Figure 1 is a structural diagram of a braking device in a traditional electric power assist mode.

The braking device of the traditional electric power assist method includes the engine, brake master cylinder, ESC (Electronic Stability Control) required to form the brake pressure of the front and rear wheels, the cylinder required to form the driver's foot power (foot power), and the pedal simulator. And two solenoid valves (valve 1, valve 2) required to close the oil circuit, ECU (Electronic Control Unit) required to control the pedal displacement sensor and the engine. Here, the valve 1 is an NC (Normal Close) type, and the valve 2 is an NO (Normal Open) type. The braking device of this traditional electric power assist method is divided into normal braking (Normal Braking) and electrical failure mode (Fail Mode) as follows.

1) Normal Braking

When the driver steps on the pedal, valve 1 opens and valve 2 closes. The pedal force felt by the driver is the reaction force produced when the rubber and spring of the pedal simulator are compressed. The engine moves the piston forward, and the pressure generated at this time is transmitted to cylinder 2 and cylinder 3, pushing the pistons of cylinder 2 and 3 to form the brake pressure of the brake cylinder.

2) Failure mode (Fail Mode)

Electrical failure, that is to say, when the engine cannot be driven, valve 1 is closed and valve 2 is opened, the pressure of cylinder 1 generated by the driver's pedaling force is transmitted to cylinder 2 and cylinder 3, and the pistons of cylinders 2 and 3 are pushed to form a brake brake pressure of the cylinder.

In this electric power-assisted braking device, when the first circuit (①) fails, not to mention that the engine cannot generate brake pressure, even in the electrical failure mode, the second circuit (②) and the third circuit (③) No pressure can be formed on the top and the brake cannot be completed. In other words, even if the engine is working normally, oil is lost in the first line, and even if cylinder 1 is activated by the pedal, oil is still lost through the first line.

Contents of the invention

technical problem

The invention not only can realize safe braking when electrical faults and hydraulic line faults occur, but also can realize safe braking intelligent power-assisted braking devices in the case of faults when the driver is stepping on the pedal.

Further, the present invention aims to provide an intelligent power-assisted braking device that can provide a handbrake function even without a separate handbrake.

Technical solutions

In order to achieve the above-mentioned technical problems, an intelligent power-assisted braking device according to an embodiment of the present invention includes a sub-brake master cylinder whose internal piston generates hydraulic pressure with pedal force, and drives the engine for braking to generate hydraulic pressure internally, or through hydraulic pressure The hydraulic pressure transmitted by the line generates hydraulic pressure internally, and the above-generated hydraulic pressure is transmitted to the brake master cylinder of the wheel brake caliper through the first brake line and the second brake line, and the hydraulic flow from the sub-brake master cylinder is converted into a pedal simulation Converter, or the hydraulic pressure conversion part connected to the hydraulic line connected to the brake master cylinder, and the positive hydraulic transmission part located on the above-mentioned first brake line and the second brake line.

The hydraulic pressure switching means switches the hydraulic flow to the pedal simulator when the engine is driven normally, and switches the hydraulic flow to the hydraulic line when the engine cannot be driven. The forward hydraulic transmission component includes a first check valve on the first brake line and a second check valve on the second brake line.

Further, the intelligent power-assisted braking device also includes a parallel connection with the positive hydraulic transmission component, which is in an inactive state when the engine is driving normal brake pressurization without abnormality, and is in an active state when the normal brake decompression is performed, and cannot be driven. Engine, inactive reverse hydraulic transmission components.

Beneficial effect

The intelligent power-assisted braking device of the present invention restricts the hydraulic pressure applied to the brake caliper when the intelligent power-assisted braking fails while the driver is stepping on the pedal. There will be more than 0.3g of brake pressure to ensure stability. In addition, the power supply is turned off after the braking pressure required for parking is formed, and the hydraulic pressure applied to the brake caliper is restricted, so that the handbrake is not required, which helps to reduce the number of components of the entire vehicle system and save costs.

Description of drawings

Fig. 1 is a structural diagram of a conventional electric power-assisted braking device;

Fig. 2 is a structural diagram of an intelligent power-assisted braking device;

Fig. 3 is a general working principle reference diagram of the intelligent power-assisted braking device shown in Fig. 2;

Fig. 4 is a working description reference diagram when the circuit of the intelligent power-assisted braking device shown in Fig. 2 fails;

Fig. 5 is a working description reference diagram of the intelligent power-assisted braking device shown in Fig. 2 when an electrical failure occurs;

Fig. 6 is a reference diagram for explaining the action of normal brake pressurization of an intelligent power-assisted braking device according to an embodiment of the present invention;

Fig. 7 is an explanatory reference diagram of an intelligent power-assisted braking device according to an embodiment of the present invention during normal braking and decompression;

FIG. 8 is a reference diagram for explaining the operation of the intelligent power-assisted braking device according to an embodiment of the present invention when an electrical failure occurs.

Explanation of reference signs

100: hydraulic oil tank 200: brake master cylinder

210 : first piston 220 : second piston

300 : sub brake master cylinder 310 : sub piston

400 : engine 500 : power transmission part (ball screw)

600 : Hydraulic switching parts 610 : NC valves

620 : NO Valve 700 : Pedal Simulator

800 : forward hydraulic transmission part 810 : first check valve

820 : Second check valve 900 : Reverse hydraulic transmission part

910 : first valve 920 : second valve.

detailed description

The specific implementation manner of the present invention will be further described below in conjunction with the accompanying drawings. The following describes the present invention in detail through implementation modes, so that practitioners in related fields can understand and reproduce it more easily.

Fig. 2 is a structural diagram of the intelligent power-assisted braking device.

The hydraulic oil tank 100 stores oil, and supplies oil to the brake master cylinder 200 and the sub-brake master cylinder 300 . The brake master cylinder 200 internally includes a first piston 210 and a second piston 220 connected in series, connected to the first brake line (①) and the second brake line (②). The sub-brake master cylinder 300 is connected to the brake pedal, and the sub-piston 310 inside it moves with the force of the brake pedal. The engine 400 and the power transmission member 500 are components required for the movement of the first piston 210 of the master cylinder 200 . In one embodiment, the power transmission member 500 is a ball screw. The ball screw 500 converts the rotational motion of the engine 400 into a linear motion, and transmits its motion force to the first piston 210 . The hydraulic pressure conversion unit 600 is required to convert the hydraulic flow from the sub master cylinder 300 to the pedal simulator 700 or the hydraulic line (③) connected to the master cylinder 200 . In one embodiment, the hydraulic conversion part 600 includes an NC type solenoid valve 610 and an NO type solenoid valve 620 . The NC valve 610 is a valve required to switch the hydraulic flow from the sub master cylinder 300 to the pedal simulator 700, and the NO valve 620 is required to switch the hydraulic flow from the sub master cylinder 300 to the hydraulic line (③) valve.

Fig. 3 is a general working description reference diagram of the intelligent power-assisted braking device shown in Fig. 2 .

When the driver depresses the brake pedal, sensors such as sensors located on one side of the brake pedal or displacement sensors transmit sensing data to the ECU. The ECU receives the sensing data and controls the opening and closing of the valve of the hydraulic conversion part 600 . As a result, the NO valve 620 that was originally opened is closed, and the NC valve 610 that was originally closed is opened. Therefore, the hydraulic pressure generated in the sub master cylinder 300 is transmitted to the pedal simulator 700 through the NC valve 610 . And, the ECU controls the control pressure of the front wheels/rear wheels according to the sensing data, and drives the engine 400 in order to form the calculated control pressure. The engine 400 is driven according to the control of the ECU, and the rotational motion of the engine 400 is converted into a linear motion through the ball screw 500 , and the motion force is transmitted to the first piston 210 of the brake master cylinder 200 . Thus, the first piston 210 starts to work, and the hydraulic pressure and spring rebound force generated when the first piston 210 works will drive the second piston 220 . In addition, the hydraulic pressure generated by the first piston 210 will be transmitted to the FL, RR brake calipers or FR, RL brake calipers through the first brake line (①) to form brake pressure, and the hydraulic pressure generated by the second piston 220 will pass through the second brake line (②) Transfer to FR, RL brake calipers or FL, RR brake calipers to form brake pressure.

Fig. 4 is a reference diagram for explaining the operation of the intelligent power-assisted braking device shown in Fig. 2 when the hydraulic line fails.

The figure is an example of the action when the hydraulic line (③) is abnormal, and the working method is consistent with the description with reference to Figure 3. However, in this structure, due to the failure of the hydraulic line (③), the first brake line (①) does not form pressure, but the first piston 210 connected to the ball screw 500 works under the drive of the engine 400, and pushes the first brake line mechanically. The two pistons 220 can effectively form pressure on the second brake line (②), thereby achieving braking.

5 is a reference diagram for explaining the operation when an electrical failure occurs in the brake device of the electric power assist system shown in FIG. 2 .

The figure is an example of the operation when the engine 400 cannot be driven. Unlike the situation in FIGS. 3 and 4 , even if the driver steps on the brake pedal, the NC valve 610 remains closed and the NO valve 620 remains open. Since the NO valve 620 is in an open state, the hydraulic pressure generated in the sub master cylinder 300 is transmitted to the space between the first piston 210 and the second piston 220 of the brake master cylinder 200 . Under this pressure, pressure is formed on the first brake line (①), the second piston 220 also starts to work, and pressure is also formed on the first brake line (①). Thereby, braking can be achieved.

Fig. 6 is a structural diagram of an intelligent power-assisted braking device according to an embodiment of the present invention.

The intelligent power-assisted braking device shown in FIG. 6 includes the forward hydraulic transmission component 800 shown in FIG. 2 , and further includes a reverse hydraulic transmission component 900 . In one embodiment, the forward hydraulic pressure transmission component 800 is located on the first brake line (①) and the second brake line (②) to transmit the hydraulic pressure from the brake master cylinder 200 to the wheel brake calipers, and also prevent reverse flow through the first check valve 810 and the second check valve 820 . In one embodiment, the reverse hydraulic transmission component 900 includes a first valve 910 connected in parallel with the first check valve 810 and a second valve 920 connected in parallel with the second check valve 820 . In one embodiment, the first valve 910 and the second valve 920 are NC type solenoid valves. The operation of such an intelligent power-assisted braking device during normal brake pressurization is basically the same as that described in FIG. 3 . That is, the first piston 210 and the second piston 220 of the brake master cylinder 200 work to generate hydraulic pressure under the driving of the engine 400, and the generated hydraulic pressure is transmitted to FR, FL, RR, RL brake calipers form the brake pressure.

Fig. 7 is an explanatory reference diagram of the intelligent power-assisted braking device during normal braking decompression in one embodiment of the present invention.

During normal brake decompression, the first valve 910 and the second valve 920 constituting the reverse hydraulic transmission part 900 will be opened. Therefore, the hydraulic pressure originally directed to the brake caliper is transmitted to the brake master cylinder 200 in the opposite direction through the first valve 910 and the second valve 920 to reduce the braking force.

FIG. 8 is a reference diagram for explaining the operation of the intelligent power-assisted braking device according to one embodiment of the present invention when an electrical failure occurs.

In this case, the engine 400 cannot be driven. Different from the situation in FIGS. 6 and 7 , even if the driver steps on the brake pedal, the NO valve 620 remains open and the NC valve 610 remains closed. In addition, the first valve 910 and the second valve 920 constituting the reverse hydraulic pressure transmission part 900 also remain closed. Since the NO valve 620 is in an open state, the hydraulic pressure in the sub master cylinder 300 is transmitted to the space between the first piston 210 and the second piston 220 of the master brake cylinder 200 . Under the action of the hydraulic pressure, pressure is formed on the first brake line (①), the second piston 220 starts to work, and pressure is also formed on the second brake line (②), thus realizing braking. Under the action of electrical failure, the hydraulic pressure at the rear end of the first check valve 810 and the second check valve 820 is restricted, and the hydraulic pressure generated when the driver supplements the stepping force of the pedal passes through the first check valve 810 and the second check valve 820. The second check valve 820 is transmitted to the brake caliper side, so even if the foot is not stepped on again after taking off the pedal in a critical situation, a hydraulic pressure that can satisfy 0.3g will be formed.

In addition, according to a supplementary embodiment of the present invention, the intelligent power-assisted braking device drives the engine 400 when parking, so that the first piston 210 and the second piston 220 inside the brake master cylinder 200 move forward. Therefore, when the power supply of the vehicle is turned off, the NC valve of the reverse hydraulic pressure transmission part 900 is closed while maintaining the hydraulic pressure 30 bar formed on the brake caliper, so that the function of the hand brake can be realized.

The specific embodiments of the present invention have been described above. Practitioners who have general knowledge in the technical field to which the present invention belongs should understand that there may be other modified implementations within the scope of the idea of the present invention. Therefore, the above-mentioned embodiment should be viewed from the viewpoint of explaining the present invention, not to limit the invention. The scope of the present invention is not the scope of the foregoing description but the scope of the claims, and all differences within the equivalent range should be regarded as the scope of the present invention.

Claims (4)

1. an intelligent power-assisted braking arrangement, it is characterised in that including: internal piston produces the son of hydraulic pressure under pedal effort Master cylinder；

Drive electromotor hydraulic pressure needed for inside produces braking, or the hydraulic pressure transmitted by hydraulic line produces internal hydraulic pressure, logical Cross the first brake line and the second brake line master cylinder by the hydraulic pressure transfer of above-mentioned generation to braking clamp;

The flow of pressurized that above-mentioned sub-master cylinder produces is transformed into pedal simulator, or is transformed into the hydraulic pressure being connected to master cylinder The hydraulic conversion parts of line；And it is positioned at the forward hydraulic pressure transfer parts of above-mentioned first brake line and the second brake line；

When the driving of electromotor does not has exception, above-mentioned flow of pressurized is transformed into pedal simulator by hydraulic conversion parts, it is impossible to drive During dynamic electromotor, above-mentioned flow of pressurized is transformed into hydraulic line；

Described forward hydraulic pressure transfer parts include the first check-valves being positioned at the first brake line and are positioned at the second of the second brake line Check-valves；

Also include, and above-mentioned forward hydraulic pressure transfer Components Parallel Connection, electromotor drive do not have abnormal normal brake application to pressurize time at In unactivated state, it is active during normal brake application decompression, it is impossible to when driving electromotor, be in the reverse of unactivated state Hydraulic pressure transfer parts.

Intelligence power-assisted braking arrangement the most according to claim 1, it is characterised in that above-mentioned reverse hydraulic pressure transfer parts bag Include, first valve in parallel with the first check-valves and second valve in parallel with the second check-valves.

Intelligence power-assisted braking arrangement the most according to claim 2, it is characterised in that above-mentioned first valve and the second valve are NC (Normal Close) type electromagnetic valve.

The most according to claim 3 intelligence power-assisted braking arrangement, it is characterised in that above-mentioned master cylinder when parking at it The internal hydraulic pressure that produces, formation braking pressure.