DCDC (direct current-direct current) control method of moderate hybrid electric vehicle

Abstract

The invention relates to a DCDC (direct current-direct current) control method of a moderate hybrid electric vehicle. The DCDC control method saves the fuel oil through setting an output voltage class according to the automatic starting and closing of the running mode of a hybrid electric system, judges a starting condition through values of DCDC input / output current and voltage, and judges the DCDC starting condition through the monitoring of the DCDC temperature. The invention simultaneously embeds a fault diagnosis function between an HCU (hydraulic control unit) controller and the DCDC. Through the implementation of the invention, the DCDC output precision can be enabled to be closer to the power utilization balance of the whole vehicle, thereby saving the energy of the whole vehicle and simultaneously reducing the power consumption of the DCDC; and the detections on the temperature, the current and the voltage are used to judge the starting condition, thus the faults of the hybrid electric system are decreased, and the power utilization safety is ensured, and the invention is the guarantee of the power utilization safety of the whole vehicle.

Description

technical field [0001] The invention belongs to the technical field of hybrid electric vehicle control, and relates to a DCDC control technology for hybrid electric vehicles. Background technique [0002] With the advent of the energy crisis, the design and development of energy-saving and environmentally-friendly vehicles was born, in which energy utilization and conversion methods are directly related to the energy-saving effect of the vehicle. One of the most important techniques, however, is the DCDC control method. DCDC is a DC converter assembly for hybrid electric vehicles. Its function is to convert the high-voltage direct current of the driving battery into low-voltage direct current to meet the power consumption of the battery and the low-voltage electrical appliances of the vehicle. This method is different from the traditional vehicle model that relies on the engine to drive a small motor to generate electricity. This makes DCDC play a very critical role in dri...

AI Technical Summary

Problems solved by technology

The traditional DCDC control method is only to control the DCDC according to the vehicle operation mode and the low-voltage power consumption situation. When the power consumption is large, it outputs a large power; when the power consumption is small, it adopts the form of low power and low voltage. Output to electrical equipment, this control method uses a single voltage level output, which cannot efficiently supply power to low-voltage electrical appliances according to the actual situation, resulting in a mismatch between actual demand and supply, resulting in loss of electrical energy

The fault diagnosis of DCDC is not embedded in the traditional DCDC control method, so its working reliability cannot be guaranteed

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