Cooling system of range increasing system of electric vehicle and control method of cooling system

Abstract

The invention discloses a cooling system of a range increasing system of an electric vehicle and a control method of the cooling system. The cooling system comprises three loops, wherein a first loop is used for cooling an engine and consists of an engine cooling water pump, a radiator and an overflow kettle which are serially connected, a second loop is used for cooling the engine, a driving motor and a frequency converter and consists of a radiator, a cooling water pump, an overflow kettle, a driving motor, a driving motor controller, an engine and an engine controller which are serially connected, the third loop is used for cooling a power battery system and consists of a radiator, first blocking valves, a second blocking valve, the power battery system and a backflow water pump, the radiator of the third loop, the second blocking valve, the power battery system and the backflow water pump are serially connected to form a loop, and the first blocking valves are connected to two ends of the backflow water pump in parallel. The control method includes sufficiently utilizing cooling ability of the radiator, the cooling water pump and a cooling fan to cool down and control an integral vehicle system of the engine. Work efficiency of the range increasing system and energy conversion efficiency can be improved.

Description

technical field [0001] The invention relates to the field of range-extending electric vehicles, in particular to a cooling system and a control method for the range-extending system of the electric vehicle. Background technique [0002] With the progress of society, people's awareness of environmental protection has increased, and the "low-carbon, environmentally friendly, green" travel mode has gradually attracted great attention. The research on high-efficiency, environment-friendly and energy-saving electric vehicles has aroused great attention from various automobile manufacturers in the world. Extended-range electric vehicles are driven by pure electric power, which has the advantages of reducing emissions and energy consumption. [0003] Due to the defect of the energy density of the power battery of traditional pure electric vehicles, the insufficient driving range has become an obstacle to the promotion of pure electric vehicles in the market. The range-extending e...

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Problems solved by technology

[0008] The cooling system of the current range-extending system of electric vehicles is not comprehensive enough, and the cooling system of traditional vehicles is basically used. The utilization of the cooling system is not high, and the protection of the range-extending system is not perfect.

The design of the cooling cycle system of the extended range system must meet the heat dissipation requirements of the generator set. For the generator, too high temperature will lead to a decrease in power generation efficiency; for the engine, too low temperature will cause the fuel consumption rate to be too high; As far as the battery system is concerned, the temperature is too high or too low will cause the battery efficiency to be low

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