48V hybrid electric system

Abstract

The invention discloses a 48V hybrid electric system. The system comprises a controller unit, a 12V battery, a display module, a 48V battery, a sensor unit, a DC-DC module, a BMS system, a motor controller and a BSG motor, the 48V battery provides electric energy for the BMS system and the BSG motor, the controller unit controls the motor controller to control the BSG motor through the BMS system,and the BMS system is further connected with an electronic supercharger. The controller unit obtains expected torque of an engine according to an electric signal generated by an accelerator pedal sensor, obtains target air inlet pressure of the engine by looking up a table, and obtains a target rotating speed value of the electronic supercharger by calculating a supercharging ratio. The controller unit sends the target rotating speed value to the electronic supercharger through a bus to control the air inlet pressure. The system has the advantages that working conditions of starting, stopping, starting, braking and the like of the engine are optimized, the carried electronic supercharger can rapidly build pressure, the turbine hysteresis phenomenon of a turbocharger is eliminated, and a vehicle system can have better power responsiveness in cooperation with the motor.

Description

technical field [0001] The invention relates to a hybrid system, in particular to a 48V hybrid electrical system. Background technique [0002] With the advancement of science and technology and the increasing scarcity of energy, traditional fuel-consuming vehicles can no longer meet the needs of society, while the existing new energy vehicles have a small capacity in power batteries, which cannot meet the needs of users for mileage, and are only suitable for short-distance use. . Therefore, in response to the country's call for the transition from traditional fuel-efficient vehicles to new energy vehicles, and to meet consumers' high requirements for vehicle drivability and comfort, gasoline-electric hybrid vehicles have emerged, and hybrid vehicles and fuel vehicles The same goes to the gas station to refuel, but when the hybrid vehicle starts and accelerates, due to the assistance of the electric motor, it can be driven by the battery alone to reduce fuel consumption, th...

AI Technical Summary

Problems solved by technology

[0003] Hybrid vehicles are different from traditional fuel vehicles in use. Traditional fuel vehicles use a 12V power supply voltage. In order to meet higher electrical power requirements, it is necessary to reduce the internal resistance or increase the power supply voltage, but simply by increasing the voltage and reducing the internal resistance. The driving force of the vehicle is limited. At the same time, for the vehicle electrical system, it is necessary to use a wire with a larger diameter to reduce the internal resistance, which will inevitably lead to an increase in the weight of the vehicle, which not only increases the cost but also affects fuel consumption.

At the same time, the turbocharger installed in the traditional vehicle has certain defects, such as hysteresis and slow supercharging, and for the hybrid system, the voltage of the 48V system is a better one in terms of cost, safety and performance. Therefore, a new 48V hybrid electrical system is required, so that the motor can better cooperate with the engine to drive the vehicle

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