Enable control method for pure electric automobile DC-DC converter
A pure electric vehicle and control method technology, applied in the field of electric vehicle control, can solve the problems of insufficient protection and excessive load current, and achieve the effect of realizing protection and improving efficiency
Inactive Publication Date: 2009-12-16
CHERY AUTOMOBILE CO LTD
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Problems solved by technology
[0009] Compared with traditional vehicles, the electrical equipment of the pure electric vehicle has increased a lot. In some extreme cases, the load current of the vehicle may exceed the range. In order to protect the DC-DC converter, an external A fuse, but such protection is far from enough
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[0023] figure 1 It mainly illustrates the relationship between the high-voltage electrical system, low-voltage electrical system and DC-DC converter of pure electric vehicles, and also reflects the basic system structure of pure electric vehicles. The high-voltage electrical system loop of a pure electric vehicle is mainly composed of a motor, an inverter and a high-voltage battery. The function of the inverter is to realize the mutual conversion between three-phase power and DC power. The low-voltage electrical circuit mainly includes various electric loads on batteries and pure electric vehicles. The function of the DC-DC converter is to convert the 250-volt high-voltage electrical system of a pure electric vehicle into a 12-volt low-voltage electrical system for the electrical load of the vehicle. In order to improve the efficiency of the vehicle's electrical system and fully manage the only energy source of the vehicle, the DC-DC converter here needs to be controlled by t...
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The invention discloses an enable control method for a pure electric automobile DC-DC converter. The method can decide the working enable state of the DC-DC converter and the state whether a DC-DC control logic module is ready to be closed by judging various parameter inputting states; and the inputting parameters comprise a high-voltage battery connecting state signal, a high-voltage battery maximum permission discharge power and a high-voltage battery charging state. When a motor is shut down and the high-voltage battery maximum permission discharge power decided by a high-voltage battery controller is higher than the maximum discharge power suitable for the high-voltage battery, the DC-DC converter can be enabled; when the high-voltage battery charging state exceeds the charging state under which the high-voltage battery suitably works, the DC-DC converter can be enabled; and if the whole automobile controller is not requested to close all control strategies, the DC-DC converter can be enabled. The enable control method can provide the best management for the DC-DC converter, so that the efficiency of the electric system of the whole automobile is improved.
Description
technical field [0001] The invention belongs to the field of electric vehicle control, and realizes the management of the medium and high voltage batteries and low voltage batteries of the electric vehicle through the control of the DC conversion device, so that the medium and low voltage systems of the electric vehicle can work stably, reliably and safely. Background technique [0002] With the development of society and economy, the energy and environmental protection problems brought by traditional internal combustion engine vehicles have gradually attracted the attention of countries all over the world. Due to the increasing scarcity of world oil resources and the environmental pollution caused by vehicle exhaust emissions, domestic and foreign auto companies are striving to demand new energy as a power source. Automobiles are favored by experts from various countries. Of course, my country also regards the development of pure electric vehicles as an important aspect of...
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IPC IPC(8): H02J7/00B60L11/18
CPCY02T10/7216Y02T10/92Y02T10/7005Y02T10/70Y02T10/72
Inventor 刘小飞
Owner CHERY AUTOMOBILE CO LTD