Hybrid electric vehicle based on hydraulic retarder and control method thereof

Abstract

The invention relates to a hybrid electric vehicle based on a hydraulic retarder and a control method thereof. A driving system comprises a driving motor, a power battery, an engine, the hydraulic retarder, a clutch, a power coupling, a transmission, a vehicle axle and the like, wherein an output shaft of the engine is connected with a movable wheel input shaft of the hydraulic retarder, and a movable wheel output shaft of the hydraulic retarder is connected with a first input shaft of the power coupling through the clutch. A corresponding heat management system consists of a heat radiator, a cooling fan, a main path water pump, a second switch valve, a first switch valve, a bypass water pump, a cooling pipeline, and a hydraulic retarder control valve, wherein the driving motor, the power battery, a cooling water jacket of the engine and a working cavity of the hydraulic retarder are respectively connected with a heat radiator in parallel.

Description

technical field [0001] The patent of the invention relates to the technical field of hybrid electric vehicle energy management and thermal management, in particular to a water retarder-based hybrid electric vehicle and its control method. Background technique [0002] The ambient temperature has an important impact on the performance and life of the power battery. When the ambient temperature of the power battery is too high, the generation of irreversible substances inside the power battery will be accelerated, and the generation of these irreversible substances will reduce the number of battery life cycles; when the ambient temperature is too low, the formation of irreversible substances will also be accelerated, thereby affecting the service life of the battery. The low ambient temperature of the power battery not only affects its service life, but also affects the charge and discharge capacity of the power battery, and even makes it difficult to start the hybrid vehicle....

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to solve the problem that the existing hybrid electric vehicle is difficult to start in severe cold weather, and the efficiency of the hybrid electric vehicle to recover braking energy is low due to the limitation of the inherent working characteristics of the power battery, and to provide a water-based retarder. The hybrid electric vehicle and its control method can make the hybrid electric vehicle start smoothly in the severe cold environment, and at the same time significantly improve the braking energy recovery efficiency of the hybrid electric vehicle during driving.

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