Power system for mechanical-electrical-liquid hybrid-driven vehicle and control method thereof

Abstract

The invention provides a power system for a mechanical-electrical-liquid hybrid-driven vehicle and a control method thereof, and belongs to the technical field of the energy conservation and emission reduction of vehicles. A vehicle transmission system belongs to an internal-combustion engine, electromotor and hydraulic pump/motor hybrid drive power system, the electromotor and the hydraulic pumpmotor are connected with a main reducing gear and a differential mechanism directly by using the stepless speed regulating characteristic of the electromotor and the hydraulic pump motor, and the operating strength of drivers is reduced for the vehicle can be driven to run without a clutch and a speed changing box; the vehicle is driven to run by a storage battery-electromotor in the conventionalrunning process, and a hydraulic accumulator-variable pump/motor is only used for recovering and recycling the braking energy of the vehicle, so the charge impact of an electrical system is reduced, and the service life of a storage battery is prolonged; and the energy of the storage battery is insufficient due to the long-time running of the vehicle, a generator is driven by adopting a small-scale efficient internal-combustion engine which runs in the optimal state to charge the storage battery, so energy consumption and tail gas discharge which are caused by the internal-combustion engine can be reduced effectively, and the running distance of the vehicle can be ensured.

Description

technical field [0001] The invention relates to a hybrid drive vehicle power system, specifically a vehicle transmission system driven by an internal combustion engine, an electric motor, and a hydraulic pump / motor. The battery-electric motor is the main power source, and the hydraulic system is used to recover and reuse the braking energy of the vehicle. The internal-combustion engine runs in an optimal working state only when the energy of the storage battery is insufficient and drives a generator to charge the storage battery, which belongs to the technical field of vehicle energy saving and emission reduction. Background technique [0002] Pure electric vehicles and hybrid electric vehicles can effectively realize the energy saving and emission reduction of vehicles, and more and more people pay more and more attention to them, becoming the most important research direction of new energy vehicles. Pure electric vehicles use electric energy as a power source, do not burn ...

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 conducive to the energy saving of electric vehicles and the extension of their mileage. 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

The only power source of a pure electric vehicle is the battery. The capacity and performance of the battery limit the mileage of the electric vehicle, making it only suitable for short-distance driving, and it is highly dependent on infrastructure such as charging stations.

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