A gasoline-electric hybrid transmission for automobiles

Abstract

The invention discloses an automobile gas-electric hybrid power gearbox. The automobile gas-electric hybrid power gearbox comprises an engine, a hybrid power module and a gearbox body. The hybrid power module is composed of a motor and a single-planet-wheel planet row. A rotor of the motor is connected with a sun wheel of the planet row. An output shaft of the engine is connected with a gear ringof the planet row. An input shaft of the gearbox body is connected with a planet carrier of the planet row. A brake is arranged between the gear ring of the planet row and a shell of the hybrid powermodule. A first clutch is arranged between the sun wheel and the planet carrier and used for generating a pair of torque which is equal in magnitude and opposite in direction and acts on the sun wheeland the planet carrier correspondingly. The angular acceleration of an engine shaft and the angular acceleration of both the input shaft of the gearbox body and the planet carrier are selected reasonably, thus the engine can be accelerated to a preset rotational speed within the expected time and is ignited to be started, and smooth travelling of a vehicle is maintained. According to the automobile gas-electric hybrid power gearbox, the function of pure electric drive and the function of staring the engine in traveling are achieved, and the engine is started quickly and smoothly in a pure electric drive mode.

Description

technical field [0001] The invention relates to the technical field of hybrid vehicle power transmission, in particular to an automobile oil-electric hybrid gearbox. Background technique [0002] Hybrid electric vehicle is the most promising power system for industrialization and marketization in electric vehicles. Hybrid vehicles use thermal engines and motors as power sources. They can be driven by engines, electricity, or hybrids, which can reduce fuel consumption. They can also be charged with external power sources and replace part of fuel or gas with electric energy. Partially change the energy structure. [0003] The single-motor parallel hybrid power system is a kind of hybrid power system widely used in hybrid electric vehicles. It is composed of an engine, a motor, a power coupling mechanism and a mechanical gearbox. The engine drives the vehicle, generates power when driving and parking, energy regenerative braking, etc.; the function of the power coupling mecha...

AI Technical Summary

Problems solved by technology

The two power sources of the system, that is, the engine and the motor, are connected in parallel, and the driving torque output by the two power sources can directly act on the drive shaft of the wheel through mechanical transmission. Therefore, the power transmission efficiency is high, and only However, this system has a major disadvantage: the system does not have a mechanism for locking the engine shaft. When the pure electric drive is driven by the motor alone, the drive torque will be transmitted to the engine after passing through the planetary gear mechanism. A reverse torque on the shaft, reverse the engine, will damage the engine, therefore, the system does not have pure electric driving function, and there is no instruction on how to start the engine

However, this brings a problem: before the clutch is coupled, the engine shaft / ring gear R rotates at zero speed, while the sun gear S and the planet carrier C rotate at high speed; if the clutch is coupled at this time, it is equal to the three shafts of the planetary gear train To carry out a completely inelastic rotational collision, this rotational collision will produce a negative torque shock on the torque output shaft C, which is generated by the moment of inertia of the engine shaft, and this negative torque will have a negative impact on the vehicle when it is transmitted to the wheels. The impact of the speed will make the passengers feel uncomfortable, what's more, it may cause damage to the mechanical structure and cause a safety accident

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