Electro-hydraulic composite braking system hierarchical control structure and method of integrated braking cylinder

Abstract

The invention relates to an electro-hydraulic composite braking system hierarchical control structure and method suitable for an integrated braking cylinder. The hierarchical control structure comprises an upper layer electro-hydraulic composite braking control unit and a lower layer hydraulic control unit. The upper layer electro-hydraulic composite braking control unit is in communication with the lower layer hydraulic control unit through a whole vehicle control system, the current running state of a vehicle is obtained, braking force distribution and stability control are achieved, needed wheel cylinder target pressure is sent to a lower layer hydraulic adjusting unit for real-time adjusting, and wheel cylinder practical pressure is sent to the upper layer electro-hydraulic composite braking control unit. Control system modularization is achieved, hierarchical design is achieved, software and hardware independent design, debugging, installing and testing are convenient, vehicle stability control can be integrated, the structure can be combined with regeneration braking to form an electro-hydraulic composite braking system, and the structure and the method can be widely suitable for braking systems of a pure electric vehicle, a hybrid power vehicle and a fuel cell vehicle.

Description

technical field

[0001] The invention relates to a control framework and method of an automobile braking system, in particular to a layered control framework and control method of an electro-hydraulic composite braking system suitable for an integrated brake master cylinder. Background technique

[0002] The powertrain of new energy vehicles such as pure electric vehicles, hybrid electric vehicles and fuel cell electric vehicles all use the motor-battery as the core to form an electric drive system. Kinetic energy recovery function. The use of regenerative braking can effectively recover the energy originally dissipated as heat energy during vehicle braking, and improve the energy utilization efficiency, fuel economy and emission performance of new energy vehicles. Since the motor feedback braking torque is limited by the external characteristics of the motor and the charging characteristics of the battery, it cannot meet the vehicle braking requirements on roads with high a...

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