Electrical-hydraulic hybrid power transmission system

Abstract

The invention discloses a novel electrical-hydraulic hybrid power transmission system for a saloon car. The system comprises an electric driving system, a coupling mechanism and a hydraulic driving system, and the hydraulic driving system is connected with the coupling mechanism through a clutch. According to the novel electrical-hydraulic hybrid power transmission system applied to the saloon car, the hydraulic driving system composed of a hydraulic pump / motor, a high-lower pressure energy accumulator, a hydraulic valve component and a hydraulic controller on the basis of an original pure electric automobile transmission system, braking energy can be recycled and utilized more effectively, influences, produced on the cycle life of an accumulator, of large current charging and discharging are avoided, and electrical losses of an electric motor and abrasion of a friction plate of a brake are reduced.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a novel electro-hydraulic hybrid power transmission system for cars. Background technique [0002] At present, domestic pure electric vehicles have problems such as short mileage of a single charge, high price, and cannot meet the needs of long-distance journeys, and the charging facilities are not perfect at present. In order to increase the mileage of pure electric vehicles, it is necessary to increase battery capacity. The increase in battery capacity will greatly increase the cost of vehicle manufacturing. In addition, due to the low power density of the battery, the dynamic response of the car will be slow when starting or braking, and the power performance and braking performance of the car cannot be fully utilized. In order to increase the mileage of a single-charge battery, in today's battery technology is difficult to break through, major car manufacturers ha...

AI Technical Summary

Problems solved by technology

The result of using electric energy recovery is to increase the continuous driving ability of pure electric vehicles, but it also exposes some problems, such as the charging current of the generator to the battery will be relatively large when braking, and high current charging will have a negative impact on the cycle life of the battery. It has a great impact, and when the vehicle starts, accelerates, climbs and other working conditions, the discharge current of the battery will also be very large, which will also have an impact on the life of the battery, so people have considered the auxiliary energy recovery system (also the auxiliary braking system) / Drive System)

[0003] The current auxiliary energy recovery systems that can be used in pure electric vehicles mainly include hydraulic energy storage systems and supercapacitor energy storage systems. Both supercapacitors and hydraulic energy storage have the advantages of high power density, which can avoid the impact of high current charging and discharging on the battery. However, the internal resistance of the supercapacitor is too small, which makes the battery difficult to manage, difficult to match with the battery parameters, and has poor safety and high cost.

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