Series/parallel double-motor and multi-clutch hybrid drive unit for vehicle

Abstract

The invention provides a series / parallel double-motor and two-clutch hybrid electric drive unit for a vehicle, comprising a main drive motor, an integrated starter-generator, a compensating gear, a principal axis, a first-level reduction gear, a main clutch and a first clutch, wherein the main drive motor is connected with the first-level reduction gear by the first clutch. The invention also provides a series / parallel double-motor and tri-clutch hybrid electric drive unit for the vehicle, which comprises a second clutch and a second-level reduction gear on the basis of the double-motor and two-clutch hybrid drive unit. In the hybrid electric drive unit of the invention, the inner structure has compact layout and the inner connection is high efficient and reasonable; the hybrid electric drive unit of the invention can realize switch of connection and disconnection between each hybrid power source and wheels and achieves switch between operating modes and gears for a hybrid power-driven system by switching power output torque.

Description

technical field [0001] The present invention relates to a hybrid electric vehicle, especially a plug-in hybrid electric vehicle, in particular to a hybrid electric drive unit for vehicle series / parallel dual-motor multi-clutch power shifting and a corresponding multi-stage hybrid drive system, as well as the The electric drive unit and the drive system preferably have corresponding drive methods. Background technique [0002] Today, when energy saving and environmental protection have become the mainstream of the development of the automobile industry, hybrid electric vehicles have become the key core technology for the vigorous development of automobile manufacturers in various countries. Among them, the plug-in hybrid solution, as the most fuel-efficient hybrid solution other than pure electric, is being respected by major manufacturers. The plug-in hybrid is mainly composed of a relatively small-displacement engine and one or two electric motors. Generally, the electric ...

AI Technical Summary

Problems solved by technology

The design scheme of the hybrid electric vehicle is simple in structure and low in cost, but due to the large space requirement of the internal drive system of the vehicle, it is usually only suitable for large vehicles or rear-drive vehicles, and usually the output power of the drive integrated motor is not large, and the vehicle is driven by pure electric power. It is difficult to guarantee the driving performance of the whole vehicle

[0006] 3. The series-parallel power distribution method, such as the Toyota Hybrid System launched by Toyota Motor Corporation (refer to the Chinese patent application with the application number 200480019795.5 and the invention name "Power output device for hybrid vehicles") and the Advanced Hybrid of General Motors Corporation of the United States System (refer to the Chinese patent application with the application number 200480038070.0 titled "Hybrid electromechanical transmission with four fixed transmission ratios, dual-mode compound distribution modes"), both using an engine and two motors through one or more planetary The gear system is connected, and the principle of power distribution (Power Split) is used to realize power coordination and speed change to meet the driving needs of the whole vehicle. However, the power transmission path of this method is complicated, and there is unnecessary conversion of mechanical energy into electrical energy and then into mechanical energy for drive output. Phenomenon of loss of power transmission

However, in the pure electric drive driving condition of the car, since the main reducer directly drives the vehicle, it is difficult to take into account the design requirements of the slope, acceleration performance and the highest electric driving speed, etc. Usually, a high-torque high-speed motor must be used to match it. The functional requirements for power electronic (electric) controllers and battery systems have increased accordingly. Even so, it is difficult to ensure that the motors often work in a higher efficiency range under urban conditions.

In addition, when the battery energy is low and needs to be transferred to the hybrid driving of the motor / engine, due to the limitation of the minimum stable engine speed and torque characteristics of the engine, in many driving conditions, such as when facing low-to-medium speed urban road conditions and cross-slope road conditions, The engine can only participate in the work like the aforementioned serial mode, which greatly reduces the energy utilization efficiency

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