Gasoline-electric and hydraulic compound hybrid power transmission system

Abstract

The invention provides a gasoline-electric and hydraulic compound hybrid power transmission system which is composed of an engine and mechanical transmission module, an electric transmission module and a hydraulic transmission module, wherein the engine and mechanical transmission module comprises an engine, a power distributor, a clutch, a gear transmission mechanism and a differential mechanism; the electric transmission module comprises a first motor, a second motor, a power battery pack and an electric control system, and the hydraulic transmission module comprises a hydraulic pump, a hydraulic motor, a hydraulic energy accumulator and a hydraulic control system. The gasoline-electric and hydraulic compound hybrid power transmission system is efficient, energy-saving and environmental friendly; in the state of forward gear, a gasoline-electric and hydraulic compound mode can be switched to a gasoline-electric hybrid power transmission mode, a mechanical-hydraulic split / parallel transmission mode, a motor-mechanical power transmission mode, a gasoline-electric series transmission mode, a gasoline-hydraulic series transmission mode or an electric-hydraulic series power transmission mode, and stepless speed change of a vehicle is realized in the modes, and the gasoline-electric and hydraulic compound mode also can be switched to an engine-mechanical power transmission mode.

Description

technical field [0001] The invention belongs to a vehicle power transmission system, and in particular relates to a hybrid power transmission system which uses an engine and an electric motor as power sources and comprehensively applies mechanical transmission, electric transmission and hydraulic transmission. Background technique [0002] The power transmission system of modern vehicles can be roughly divided into: engine-mechanical power transmission system, electric motor-mechanical power transmission system (pure electric), oil-electric hybrid power transmission system, hydraulic power transmission system, mechanical-hydraulic power transmission system according to power source and transmission mode Parallel / split drive systems, etc. [0003] The engine-mechanical power transmission system is traditionally called the traditional energy power transmission system, which is a vehicle composed of diesel, gasoline, various liquefied gas and other fuels as the energy source, t...

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Problems solved by technology

[0006] The hydraulic power transmission system uses diesel, gasoline, various liquefied gas and other fuels as energy sources and uses the engine as the power source alone, or uses various electric energy storage devices to provide energy and uses the electric motor as the power source alone, and hydraulic pumps and hydraulic motors The power transmission system composed of hydraulic control system, hydraulic servo actuator and hydraulic pipeline, etc., its basic working principle is that the power source drives the hydraulic pump to generate high-pressure oil, and then drives the hydraulic motor through the high-pressure oil to realize the power of the system Transmission, its characteristics are: the power transmission is realized by hydraulic means without too many mechanical transmission parts, the system structure is simple, the transmission ratio range is large and easy to adjust, the operation is stable, the vibration and noise are small, the control is relatively easy and infinitely variable speed can be realized; The disadvantage is that the output speed of the hydraulic motor should not be too high. With the increase of the vehicle speed, the overall transmission efficiency of the system decreases rapidly. It is not suitable for the transmission of the vehicle in the middle and high speed driving state, so its application field is limited.

[0007] The mechanical-hydraulic compound transmission system uses diesel, gasoline, various liquefied gas and other fuels as energy sources and the engine as the power source alone, and is connected with power distribution devices, power coupling devices, hydraulic pumps, hydraulic motors, hydraulic control systems, and mechanical transmissions. The power transmission system composed of devices, etc., is characterized by using the power distribution device to distribute the power output by the engine to the hydraulic power transmission module and the mechanical transmission module, and automatically matching and adjusting the distribution ratio according to the vehicle working conditions, and then through the power coupling The device couples the power of the hydraulic transmission with the power of the mechanical transmission and then outputs it to drive the vehicle. The system can effectively use the large transmission ratio of the hydraulic transmission and the characteristics of good acceleration performance in the middle and low speed range, and at the same time can make good use of The high-efficiency characteristics of mechanical variable speed transmission make the vehicle start smoothly, accelerate quickly at low speeds, and have good power matching at medium speeds, and can better realize the effective use of engine power and realize infinitely variable speeds; When the energy of the energy is maintained at a high ratio for a long time, the overall efficiency of the system will be low, and it is not suitable for use on high-speed vehicles such as cars and large buses, thus affecting its application to a certain extent

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