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United braking system and method of vehicle

A technology of combined braking and vehicle, applied in the field of combined braking system of vehicles, can solve the problems of the complexity of auxiliary braking operation, affecting the service life of hydraulic retarder, etc.

Active Publication Date: 2020-12-25
湖南行必达网联科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under normal circumstances, the hydraulic retarder is given priority when braking. Only when the hydraulic retarder is high temperature, abnormal or at the highest gear can the engine brake be automatically activated, which will affect the performance of the hydraulic retarder. Gear life
[0005] In addition, hydraulic retarder brakes need to control the working gear through the handle, and the switching of the working gear requires manual operation by the driver according to the working conditions, which leads to the complexity of the auxiliary braking operation

Method used

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  • United braking system and method of vehicle
  • United braking system and method of vehicle

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] figure 1 It is a schematic diagram of a combined braking system of a vehicle provided in Embodiment 1 of the present invention.

[0055] refer to figure 1 , the present application is applied to trucks with a large total mass, special operation vehicles, dangerous goods transport vehicles and semi-trailer tractors, etc., for example, it is applied to a truck with a total mass greater than 12 tons.

[0056] The system includes: hydraulic retarder 8, ECU (Electronic Control Unit, electronic control unit) 4, combined brake controller 2, control unit 7, auxiliary brake switch 1, brake master valve 3, accelerator pedal 5 and Engine 6, wherein, the master brake valve 3 is provided with a first stroke sensor, and the accelerator pedal 5 is provided with a second stroke sensor;

[0057] ECU4, control unit 7, auxiliary brake switch 1 and master brake valve 3 are respectively connected to combined brake controller 2, control unit 7 is connected to hydraulic retarder 8, accelera...

Embodiment 2

[0099] Figure 5 It is a schematic diagram of the combined braking process of the vehicle provided by Embodiment 2 of the present invention.

[0100] refer to Figure 5 , the auxiliary brake switch controls the combined braking system to enter the standby state and exit. The combined braking controller receives the vehicle speed, accelerator opening, current brake pedal stroke, engine speed, clutch pedal stroke and ABS signal, etc., makes logical judgments through the combined braking controller, and outputs execution signals. By default, the combined braking The system uses the engine brake first. When the engine brake cannot be activated or the engine brake cannot meet the braking demand, the driver activates the hydraulic retarder brake by controlling the accelerator pedal to achieve the combined braking function.

[0101] In addition, if the combined braking system judges that the brake opening condition of the engine has not been met, the hydraulic retarder brake will b...

Embodiment 3

[0103] Figure 6 It is a flowchart of a combined braking method for a vehicle provided in Embodiment 3 of the present invention.

[0104] refer to Figure 6 , including the combined braking system of the vehicle as described above, the combined braking system of the vehicle includes a hydraulic retarder, an ECU, a combined braking controller, a control unit, an auxiliary brake switch, a master brake valve, an accelerator pedal and Engine, wherein, a first stroke sensor is arranged in the master brake valve, and a second stroke sensor is arranged in the accelerator pedal, and the method includes the following steps:

[0105] Step S101, collect the current brake pedal stroke through the first stroke sensor, and the current brake pedal stroke is used to represent the travel range of the brake pedal movement;

[0106] In step S102, the accelerator opening is collected by the second stroke sensor, and the accelerator opening is used to represent the opening of the accelerator ped...

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Abstract

The invention provides a united braking system and method for a vehicle. The united braking system comprises a hydraulic retarder, an ECU, a united braking controller, a control unit, an auxiliary braking switch, a braking main valve, an accelerator pedal and an engine. A first stroke sensor is arranged in the braking main valve; a second stroke sensor is arranged in the accelerator pedal; the first stroke sensor collects the current brake pedal stroke; the second stroke sensor collects the accelerator opening degree; the ECU sends the accelerator opening degree to the united brake controllerunder the condition that the auxiliary braking switch is turned on; the united brake controller sends a control instruction to the ECU under the condition that the accelerator opening degree meets theunited brake opening condition, so that the ECU controls the engine to brake according to the control instruction; when the current working condition does not meet the starting condition of engine braking or the engine braking does not meet the braking demand, different working gears are adjusted to according to the current brake pedal stroke; and the control unit controls the hydrodynamic retarder to brake according to different working gears.

Description

technical field [0001] The invention relates to the technical field of vehicle control, in particular to a vehicle combined braking system and method. Background technique [0002] Heavy-duty vehicles have an increased demand for braking power under complex working conditions (long downhill braking, steep slope braking, frequent braking, etc.), at this time a single service braking may be difficult to meet the braking demand, which may cause The wear and heat of the disc will cause the service brake to fail in severe cases and cause traffic accidents. [0003] At present, in order to meet the braking requirements of the whole vehicle, retarders or in-cylinder brakes are usually used as auxiliary brakes. When combining hydraulic retarder braking with engine braking, the following methods are generally adopted, specifically: according to the hydraulic The braking position switch of the hydraulic retarder collects the driver's braking demand and the working status of the hydra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T8/17B60T8/172B60T10/02
CPCB60T8/17B60T8/172B60T10/02
Inventor 徐磊肖波袁进
Owner 湖南行必达网联科技有限公司
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