Hybrid power control system for vehicle

Abstract

The invention discloses a hybrid power control system for a vehicle, which comprises an engine, a first generator/motor, a second generator/motor, a power coupling and distributing device and a controller; the power coupling and distributing device is a combined mechanism comprising a planetary gear mechanism in a casing, a brake and a clutch, wherein the planetary gear mechanism comprises a sun wheel, a planet carrier, a tooth ring and a planetary wheel; the brake is arranged on the planet carrier and used for braking the planet carrier; the clutch is used for controlling the relative rotation between the sun wheel and the planet carrier; and an output shaft of the motor is connected with the planet carrier, a rotor of the first generator/motor is connected with the sun wheel, and a rotor of the second generator/motor is connected with the tooth ring directly or by a retarding mechanism. The invention realizes four drive modes of pure electric drive, series-parallel drive, pure engine drive and parallel drive of the vehicle by the hybrid power control system and enhances the dynamic property and the economy of the vehicle.

Description

technical field [0001] The invention relates to a vehicle hybrid control system, in particular to a vehicle hybrid control system. Background technique [0002] Generally, hybrid drive devices are divided into three structural types: series, parallel and hybrid. The series structure is gradually eliminated due to the low transmission efficiency. The advantage of the parallel structure is high transmission efficiency, but the disadvantage is that it cannot adjust the working speed of the engine itself. The hybrid structure overcomes the shortcomings of parallel connection and has better overall performance, but the overall efficiency at high speeds is lower than that of traditional direct gear drives. [0003] A typical hybrid structure consists of an engine, a generator, an electric motor, and an ordinary planetary gear mechanism. The planetary gear mechanism is used as a power coupling and distribution device to provide vehicles with two driving modes: pure electric drive...

AI Technical Summary

Problems solved by technology

The series structure is gradually eliminated due to the low transmission efficiency

The advantage of the parallel structure is that the transmission efficiency is high, and the disadvantage is that the working speed of the engine cannot be adjusted by itself.

The hybrid structure overcomes the shortcomings of parallel connection and has better overall performance, but the overall efficiency at high speeds is lower than that of traditional direct gear drives

[0003] A typical hybrid structure consists of an engine, a generator, an electric motor, and an ordinary planetary gear mechanism. The planetary gear mechanism is used as a power coupling and distribution device to provide vehicles with two driving modes: pure electric drive and hybrid drive. However, this system exists The problems in the following two aspects: one is that the generator can only be used as a generator in addition to being used as a motor when starting the engine, and cannot be used as a driving motor to directly drive a vehicle, resulting in a waste of functions, and it cannot be driven by two motors at the same time. Advantage

Second, although the hybrid power system can improve the engine efficiency by optimizing the engine operating point when the vehicle is running at medium and low speeds, it cannot be realized at high speeds because part of the power of the engine is converted into electrical energy by the generator and then converted into mechanical energy by the motor. The pure engine directly drives the vehicle in a mechanical way, and the number of replacement links makes the overall efficiency of the vehicle not high when cruising at high speed

[0009] The technical solutions in the above patent documents can basically be classified as a hybrid power system composed of a motor and a planetary row, but none of them solves the two problems of the dual motors being simultaneously driven by the motor and the direct drive of the pure engine

[0010] In addition, even the hybrid structure with relatively good comprehensive performance in the prior art cannot be suitable for various driving conditions of the vehicle.

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