48V system and 48V system control method

Abstract

The invention belongs to the technical field of heavy commercial vehicles, and discloses a 48V system and a 48V system control method. The 48V system comprises a transmission, a drive axle, an engine,a motor, a battery, a first electrical accessory, a converter, a storage battery and a second electrical accessory, wherein the engine is in transmission connection with the drive axle through the transmission; the motor is in transmission connection with the engine; the battery is electrically connected to the motor and can drive the motor to rotate so as to enable the motor and the engine to jointly drive the drive axle to rotate through the transmission; the engine can drive the motor to rotate to generate power and store electric energy into the battery; the first electrical accessory iselectrically connected to the battery; the converter is electrically connected to the battery and is used for converting the 48V voltage into 24V voltage; and the storage battery is electrically connected to the converter and the second electrical accessory respectively. According to the 48V system, coupling control over the engine and the motor is achieved, the 48V system is used for being matched with a heavy commercial vehicle with the 48V system, it is guaranteed that the heavy commercial vehicle meets the whole vehicle dynamic property requirement in the actual working condition driving process, and the energy saving performance is good.

Description

technical field [0001] The invention relates to the technical field of heavy-duty commercial vehicles, in particular to a 48V system and a control method for the 48V system. Background technique [0002] In order to meet the increasingly stringent emission regulations and improve vehicle fuel economy, hybrid power and electrification have gradually become the main direction of future heavy-duty commercial vehicle development. Among them, 48V micro-hybrid technology has become the preferred new energy technology method for heavy-duty commercial vehicles due to its low additional cost, small vehicle changes, short investment payback period and high user acceptance. [0003] The current 48V hybrid power system and control method mainly focus on the control of battery current, power and DCDC. The battery management system adjusts the motor torque and demand current by uploading battery voltage, temperature, SOC and other information; the energy recovery system adjusts the motor...

AI Technical Summary

Problems solved by technology

[0004] The first type, the 48V energy recovery system includes auxiliary drive and braking energy recovery, but does not include engine control. As a hybrid system, the role of engine load point transfer is not considered, and the maximum fuel saving effect cannot be achieved.

[0005] The second type, the heavy truck 48V system uses two sets of 48V systems, although the purpose of reducing the current and heat in the use environment is achieved, but the cost increases significantly

[0006] Most of the existing 48V systems are used in the field of passenger cars, a small part are used in light and medium commercial vehicles, and the 48V systems of heavy commercial vehicles have not yet achieved mass production

In addition, the existing 48V system control methods do not involve the coupling control of the motor and the engine, and since the power of the 48V motor is relatively small compared to the engine power of a heavy-duty commercial vehicle, the power demand of the vehicle cannot be guaranteed, and the output of the engine and the motor is prone to conflict and throttling. Insufficient oil effect, etc.

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