Hydraulic hybrid electric vehicle transmission system and control method thereof

Abstract

The invention provides a hydraulic hybrid electric vehicle transmission system, which belongs to the technical field of vehicle energy conservation and emission reduction. The vehicle transmission system, without a clutch or a gear box, is directly connected with a main reducer and a differential to drive the vehicle according to the stepless speed regulation characteristics of an electromotor and a hydraulic pump / motor to reduce the operation strength of a driver. A storage battery-electromotor is used as the main power source of the vehicle; a hydraulic accumulator-variable pump / motor is only used for recycling and reusing the brake energy of the vehicle; during acceleration, the hydraulic pump / motor supplies extra power; particularly in start process, the hydraulic pump / motor alone drives the vehicle to start moving, and the electromotor can always run in stable conditions. The impact of variable conditions on the circuit system is reduced, the load of the storage battery is remarkably lowered, the work performance of the storage battery-electromotor is promoted, the service life of the storage battery-electromotor is prolonged, and the continuous mileage of the electric vehicle is prolonged.

Description

technical field [0001] The invention relates to a hydraulic hybrid drive electric vehicle power system, specifically a vehicle transmission system driven by a motor and a hydraulic pump / motor hybrid, the battery-motor is the main power source, and the hydraulic accumulator-variable pump / motor is used for recovery and regeneration. Utilizing the braking energy of a vehicle belongs to the technical field of vehicle energy saving and emission reduction. Background technique [0002] The continuous consumption of fossil fuels and the pollution and destruction of the earth's environment have prompted people to explore new energy sources for vehicles. The use of electric energy will not bring pollution, and the sources of electric energy are diverse, while the emissions related to obtaining electric energy are caused by fixed sources, which are easy to control and treat. Pure electric vehicles and hybrid electric vehicles can effectively realize the energy saving and emission red...

AI Technical Summary

Problems solved by technology

Electric vehicles can generally realize the recovery of braking energy during braking. The recovery and reuse of regenerative braking energy is beneficial to the energy saving of electric vehicles and the extension of their mileage, but in the short-term braking process, it is limited by the energy Generally, electric vehicles can only recover 10-15% of the braking energy, and the control is complicated. More importantly, the battery is charged and discharged frequently, which increases the load and impact of the battery and the motor, and reduces the service life of the battery. ; and in the process of starting and accelerating the vehicle, the larger output current increases the heat load of the battery, and at the same time consumes a lot of electric energy, shortens the mileage of the electric vehicle, and also reduces the use of the battery to a large extent. life

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