Electric vehicle charging current control method and its control system
A charging current, electric vehicle technology, applied in electric vehicles, battery circuit devices, current collectors, etc., can solve problems such as battery life impact, achieve accurate detection, easy implementation, and prolong service life
Inactive Publication Date: 2018-04-06
SHENZHEN JTZT TECH CO LTD
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Problems solved by technology
If the control of the charging current of the battery is not very accurate, the excessive charging current will have a serious impact on the life of the battery
Method used
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[0038] In order to express the present invention more clearly, the present invention will be further described below in conjunction with the accompanying drawings.
[0039] refer to Figure 3-4 , the present invention a kind of electric vehicle charging current control method and its control system, comprise following control steps:
[0040] S1. Power-on start: send charging current to the car charger through the CAN bus, so that the charger enters the charging state;
[0041] S2. Acquisition of the given current value: the charging current enters the current controller, and the charger decides whether to modify the output given current value according to whether it receives an external current modification command;
[0042] S3. Acquisition of the reference voltage value: the output given current value enters the conversion circuit, and the conversion circuit converts the given current value into a reference voltage value;
[0043] S4. Sampling of the output current: use the...
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The invention discloses a charging current control method and control system of an electromobile. The method comprises the following steps of sending a charging current to a vehicle charger through a CAN bus to make the charger entered a charging state; determining whether an output given current value is corrected or not by the charger according to whether an external current correction instruction is received or not when the charging current enters a current controller; converting the given current value into a reference voltage value by a conversion circuit when the output given current value enters the conversion circuit; sampling an output current of the charger in real time by a sampling circuit, and feed backing the output current into the current controller; and adjusting the conversion circuit to reduce or increase the output current value by the current controller to make the output current value equal to the given current value when the real-time output current obtained by sampling is greater or smaller than the given current value corresponding to the reference voltage value. According to the method, the charging current value of a vehicle-mounted storage battery is accurately and intelligently controlled by the current controller on the condition of no additional arrangement of the conversion circuit.
Description
technical field [0001] The invention relates to the technical field of electric vehicle charging current control, in particular to an electric vehicle charging current control method and a control system thereof. Background technique [0002] At present, the battery charging methods of electric vehicles are mainly three-stage charging modes such as constant voltage, constant current and float charging. In the initial stage of charging, due to the long-term discharge of the battery, the battery voltage is low at this time, so the charger must control the charging current of the battery to avoid excessive charging current instantaneously, which will affect the service life of the battery. After charging for a period of time, the battery starts charging in constant voltage mode, and finally the battery is fully charged through floating charging. [0003] The chargers that have been used in the existing market mainly control the charging current of the battery by adjusting the ...
Claims
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IPC IPC(8): H02J7/00
CPCH02J7/0071
Inventor 柏斌刘杰
Owner SHENZHEN JTZT TECH CO LTD