Electric proportional hydraulic hybrid device used for vehicle and a control method of electric proportional hydraulic hybrid device

Abstract

The invention belongs to the field of hybrid vehicle control systems, and specifically relates to an electric proportional hydraulic hybrid device used for a vehicle. The electric proportional hydraulic hybrid device comprises a plunger pump, a high-pressure energy accumulator, a low-pressure energy accumulator, a control motor pump set, a brake sensor, an accelerator sensor, a pressure sensor, anactive energy accumulation switch and a controller. The plunger pump is used for converting vehicle kinetic energy into potential energy to be stored in the energy accumulators or releasing the potential energy in the energy accumulators into the kinetic energy assisting in driving the vehicle. The plunger pump and the vehicle share a main shaft. The plunger pump is an electric proportional axial-direction variable-displacement plunger pump. The control motor pump set is used for controlling the displacement of the plunger pump. The brake sensor is used for sensing the position of a brake. The accelerator sensor is used for sensing the position of an accelerator. The pressure sensor is used for sensing the oil pressure in the high-pressure energy accumulator. The active energy accumulation switch is used for actively controlling the displacement of the plunger pump. The controller is used for controlling all the devices mentioned above. Meanwhile, the invention further discloses a control method of the electric proportional hydraulic hybrid device. Compared with a traditional hybrid device, by means of the electric proportional hydraulic hybrid device and the control method, spaceis saved, the energy recycling effect is good, and the electric proportional hydraulic hybrid device and the control method are worthy of application and popularization.

Description

technical field [0001] The invention relates to the field of a control system of a hybrid electric vehicle, in particular to a vehicle-electricity proportional hydraulic hybrid power device and a control method thereof. Background technique [0002] At present, the brakes of domestic medium and heavy trucks basically use brake pads, and are equipped with water tanks to spray water on the brake pads to cool them. At the same time, when it is driving on urban roads, it will frequently start, brake and other working conditions. During the starting process, the output power of the engine is very high; during the braking process, its braking energy is generally converted into Heat from the brakes is lost as thermal energy, which not only wastes energy, but also leads to heating of the system and loss of components. When driving on a downhill road, it is generally required to run smoothly and at a constant speed, which also requires the driver to brake continuously, so that braki...

AI Technical Summary

Problems solved by technology

[0003] In a brief summary, the current medium and heavy-duty trucks mainly have the following disadvantages when braking: ①From the perspective of my country's geographical environment, most places may reach below zero in winter, and the cooling water sprinkled on the road will freeze the road. Traffic poses a greater safety hazard

②When braking, the kinetic energy of the vehicle is consumed as heat, which consumes a lot of energy

④ The consumption of cooling water and brake pads is not a small cost

[0006] The above-mentioned patent scheme has good recovery and utilization of vehicle energy, but there is still a lot of room for improvement in more complex road conditions, such as emergency solutions such as super-long downhill steep slopes and improving driving comfort.

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