CN105186858A - Controller of low-voltage DC-DC converter of electric vehicle - Google Patents
Controller of low-voltage DC-DC converter of electric vehicle Download PDFInfo
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- CN105186858A CN105186858A CN201510536479.5A CN201510536479A CN105186858A CN 105186858 A CN105186858 A CN 105186858A CN 201510536479 A CN201510536479 A CN 201510536479A CN 105186858 A CN105186858 A CN 105186858A
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- value
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- low pressure
- boosting battery
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Abstract
The invention belongs to the field of vehicle electrical control, and specifically relates to a controller of a low-voltage DC-DC converter of an electric vehicle. The controller can accurately control operation of the DC-DC converter according to states of an auxiliary battery and states of vehicle load, so as to realize maximum efficiency of the DC-DC converter, and energy loss caused by the converter can be reduced, and service life of the auxiliary battery is prolonged.
Description
Technical field
The invention belongs to vehicle electric control field, be specifically related to a kind of controller of electric motor car low pressure dc-dc.
Background technology
Electric motor car usually has and comprises motor, high-tension battery, boosting battery, high pressure dc-dc, low pressure dc-dc.Motor is driven by high-tension battery, high pressure dc-dc is for changing the voltage being input to high-tension battery or exporting from high-tension battery, low pressure dc-dc for change DC high voltage into DC low-voltage thus to boosting battery charging, boosting battery is used for providing power to vehicle electric load.Electric component due to low pressure dc-dc self also needs to consume a small amount of energy, particularly low in load or when not having a load, due to the loss of self, and the whole efficiency step-down of dc-dc.Prior art, in order to head it off, promotes the maximization of dc-dc efficiency by closedown dc-dc or the output limiting dc-dc.But, prior art does not consider the state of boosting battery, thus may cause decline the useful life of boosting battery, and the amount of closing the time of dc-dc or the output of restriction dc-dc is also set as a certain constant more, control precision is not high, and control effects is bad.
Summary of the invention
The invention provides a kind of controller of electric motor car low pressure dc-dc, this controller can control the operation of dc-dc exactly according to the state of the state of boosting battery and vehicle load, to realize the maximizing efficiency of dc-dc.Technical solution of the present invention is as follows:
A kind of controller, it is for controlling the operation of low pressure dc-dc according to the state of boosting battery and the state of electrical load;
Specifically, first controller measures the bearing power that electrical load consumes, and measures the charged state SOC of boosting battery;
When bearing power is less than the first value, and SOC is when being equal to or greater than the second value, controller controls described low pressure dc-dc and quit work for first scheduled time, within described first scheduled time, fully provides all power needed for electrical load by boosting battery; When have passed through described first scheduled time, controller controls described low pressure dc-dc and again starts;
Further, when bearing power is equal to or greater than the first value, and SOC is equal to or greater than the second value, and the amplitude of variation of bearing power within the unit interval be greater than boosting battery the amplitude of variation of SOC value within the unit interval time, the power output that controller adjusts described low pressure dc-dc is to the 3rd value and continued for second scheduled time, when have passed through described second scheduled time, the power output that controller adjusts described low pressure dc-dc returns to initial value; If the amplitude of variation of bearing power within the unit interval is not more than the amplitude of variation of SOC value within the unit interval of boosting battery, then controls described low pressure dc-dc and normally work;
The value of described first scheduled time carries out calculating and setting according to following formula:
T
1=α lnSOC|P-P
1|, wherein α is the constant rule of thumb set, and SOC is the charged state of boosting battery when pre-test, and P is the bearing power when the electrical load of pre-test consumes, P
1for described first value.
The value of described second scheduled time carries out calculating and setting according to following formula:
T
2=α ln|P-P
1| × | SOC-SOC
2|, wherein, SOC
2for described second value;
Described 3rd value carries out calculating and setting according to following formula:
According to a further aspect in the invention, the invention provides a kind of electrical system of electric motor car, comprise: motor, high-tension battery, boosting battery, high pressure dc-dc, low pressure dc-dc, motor is driven by high-tension battery, high pressure dc-dc is for changing the voltage being input to high-tension battery or exporting from high-tension battery, low pressure dc-dc to be charged to boosting battery for changing DC high voltage into DC low-voltage, boosting battery is used for providing power to vehicle electric load, also comprise foregoing controller, this controller and high pressure dc-dc, low voltage DC-DC transducer signal connects
Beneficial effect of the present invention is: operating efficiency and the performance that can improve low pressure dc-dc, and can reduce the energy loss brought by transducer self, increases the useful life of boosting battery.
Accompanying drawing explanation
Fig. 1 is the electrical system architecture block diagram of electric motor car of the present invention;
Fig. 2 is the control flow chart of controller of the present invention.
Embodiment
Be described technical scheme of the present invention below in conjunction with accompanying drawing, obviously, described is only the present invention's part embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the electrical system of electric motor car comprises: motor 7, high-tension battery 4, boosting battery 5, high pressure dc-dc 2, low pressure dc-dc 3, and controller 1.Motor 7 is driven by high-tension battery 4, high pressure dc-dc 2 is for changing the voltage being input to high-tension battery 4 or exporting from high-tension battery 4, low pressure dc-dc 3 is charged to boosting battery 4 for changing DC high voltage into DC low-voltage, and boosting battery 4 is for providing power to vehicle electric load 6; Controller 1 is connected with high pressure dc-dc 2, low pressure dc-dc 3 signal.
As shown in Figure 2, controller 1 controls by following flow process:
First measure the bearing power that electrical load 6 consumes, and measure the charged state SOC of boosting battery 4;
When bearing power is less than the first value, and when SOC value is equal to or greater than the second value, controller 1 controls described low pressure dc-dc 3 and to quit work the first scheduled time T
1, at described first scheduled time T
1in, fully provide all power needed for electrical load 6 by boosting battery 4; When have passed through described first scheduled time T
1, controller 1 controls described low pressure dc-dc 3 and again starts;
Further, when bearing power is equal to or greater than the first value, and SOC value is equal to or greater than the second value, and the amplitude of variation of bearing power within the unit interval be greater than boosting battery the amplitude of variation of SOC value within the unit interval time, controller 1 controls the power output of described low pressure dc-dc 3 to the 3rd value P
3and continue the second scheduled time T
2, when have passed through described second scheduled time T
2, the power output that controller 1 controls described low pressure dc-dc 3 returns to initial value; If the amplitude of variation of bearing power within the unit interval is not more than the amplitude of variation of SOC value within the unit interval of boosting battery, then controls described low pressure dc-dc 3 and normally work;
Described first scheduled time T
1value carry out calculating and setting according to following formula:
T
1=α lnSOC|P-P
1|, wherein α is the constant rule of thumb set, and SOC is the charged state of boosting battery when pre-test, and P is the bearing power when the electrical load of pre-test consumes, P
1for described first value.
Described second scheduled time T
2value carry out calculating and setting according to following formula:
T
2=α ln|P-P
1| × | SOC-SOC
2|, wherein, SOC
2for described second value;
Described 3rd value carries out calculating and setting according to following formula:
wherein, β is the constant rule of thumb set, and P is the bearing power when the electrical load of pre-test consumes, and I is the discharging current of the boosting battery when pre-test.
Wherein, 1.0< α <3.0,0.75< β <1.2, preferably, α=2.2, β=1.0, P
1=5, SOC
2=0.8.
The present invention can improve operating efficiency and the performance of low pressure dc-dc, and can reduce the energy loss brought by transducer self, increases the useful life of boosting battery
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a controller, it is for controlling the operation of low pressure dc-dc according to the state of electrical load and the state of boosting battery,
It is characterized in that, first controller measures the bearing power that electrical load consumes, and measures the charged state SOC of boosting battery;
When bearing power is less than the first value, and SOC is when being equal to or greater than the second value, controller controls described low pressure dc-dc and quit work for first scheduled time, within described first scheduled time, fully provides all power needed for electrical load by boosting battery; When have passed through described first scheduled time, controller controls described low pressure dc-dc and again starts;
When bearing power is equal to or greater than the first value, and SOC is equal to or greater than the second value, and the amplitude of variation of bearing power within the unit interval be greater than boosting battery the amplitude of variation of SOC value within the unit interval time, the power output that controller adjusts described low pressure dc-dc is to the 3rd value and continued for second scheduled time, when have passed through described second scheduled time, the power output that controller adjusts described low pressure dc-dc returns to initial value; If the amplitude of variation of bearing power within the unit interval is not more than the amplitude of variation of SOC value within the unit interval of boosting battery, then controls described low pressure dc-dc 3 and normally work.
The value of described first scheduled time carries out calculating and setting according to following formula:
T
1=α lnSOC|P-P
1|, wherein α is the constant rule of thumb set, and SOC is the charged state of boosting battery when pre-test, and P is the bearing power when the electrical load of pre-test consumes, P
1for described first value.
The value of described second scheduled time carries out calculating and setting according to following formula:
T
2=α ln|P-P
1| × | SOC-SOC
2|, wherein, SOC
2for described second value;
Described 3rd value carries out calculating and setting according to following formula:
Wherein, β is the constant rule of thumb set.
2. controller according to claim 1, is characterized in that, 1.0< α <3.0,0.75< β <1.2, preferably, and α=2.2, β=1.0, P
1=5, SOC
2=0.8.
3. the electrical system of an electric motor car, comprise: motor, high-tension battery, boosting battery, high pressure dc-dc, low pressure dc-dc, motor is driven by high-tension battery, high pressure dc-dc is for changing the voltage being input to high-tension battery or exporting from high-tension battery, low pressure dc-dc for change DC high voltage into DC low-voltage thus to boosting battery charging, boosting battery is used for providing power to vehicle electric load;
It is characterized in that, also comprise controller as claimed in claim 1 or 2, this controller is connected with high pressure dc-dc, low voltage DC-DC transducer signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810437526.4A CN108599553A (en) | 2015-08-25 | 2015-08-25 | A kind of electrical system of electric vehicle |
| CN201510536479.5A CN105186858B (en) | 2015-08-25 | 2015-08-25 | A kind of controller of electric car low pressure dc-dc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510536479.5A CN105186858B (en) | 2015-08-25 | 2015-08-25 | A kind of controller of electric car low pressure dc-dc |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810437526.4A Division CN108599553A (en) | 2015-08-25 | 2015-08-25 | A kind of electrical system of electric vehicle |
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|---|---|
| CN105186858A true CN105186858A (en) | 2015-12-23 |
| CN105186858B CN105186858B (en) | 2018-05-29 |
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ID=54908760
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|---|---|---|---|
| CN201810437526.4A Pending CN108599553A (en) | 2015-08-25 | 2015-08-25 | A kind of electrical system of electric vehicle |
| CN201510536479.5A Active CN105186858B (en) | 2015-08-25 | 2015-08-25 | A kind of controller of electric car low pressure dc-dc |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201810437526.4A Pending CN108599553A (en) | 2015-08-25 | 2015-08-25 | A kind of electrical system of electric vehicle |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105667330A (en) * | 2016-01-11 | 2016-06-15 | 潍柴动力股份有限公司 | Control method and system for DCDC (direct current direct current) |
| CN106080239A (en) * | 2016-07-01 | 2016-11-09 | 北京新能源汽车股份有限公司 | Low-voltage storage battery charging control method of electric vehicle and electric vehicle |
| CN108725233A (en) * | 2017-04-25 | 2018-11-02 | 郑州宇通客车股份有限公司 | Battery management system and vehicle management system with all the period of time monitoring |
| CN108791134A (en) * | 2017-05-04 | 2018-11-13 | 沃尔沃汽车公司 | Battery balance method |
| CN108973903A (en) * | 2018-08-02 | 2018-12-11 | 北京新能源汽车股份有限公司 | Vehicle-mounted power supply system and vehicle |
| CN109861526A (en) * | 2019-02-27 | 2019-06-07 | 中国第一汽车股份有限公司 | The control method of DC/DC |
| CN110040016A (en) * | 2018-01-17 | 2019-07-23 | 保时捷股份公司 | Power supply unit for motor vehicles |
| CN112477598A (en) * | 2020-12-07 | 2021-03-12 | 安徽江淮汽车集团股份有限公司 | Electric automobile low-voltage system control method, device, equipment and storage medium |
| AU2017357736B2 (en) * | 2016-11-10 | 2022-04-21 | Ocean Power Technologies, Inc. | High DC voltage to low DC voltage conversion apparatus including rechargeable batteries |
| CN118544881A (en) * | 2024-07-31 | 2024-08-27 | 比亚迪股份有限公司 | Vehicle, control method, device, storage medium and computer program product thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112234819B (en) * | 2020-10-14 | 2022-02-01 | 睿驰电装(大连)电动系统有限公司 | Low-voltage power supply method and device based on DC-DC and electronic equipment |
| EP4425639A1 (en) * | 2021-12-28 | 2024-09-04 | Contemporary Amperex Technology Co., Limited | Battery system charging and discharging method and apparatus, battery system, and electric vehicle |
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| CN105667330A (en) * | 2016-01-11 | 2016-06-15 | 潍柴动力股份有限公司 | Control method and system for DCDC (direct current direct current) |
| CN106080239A (en) * | 2016-07-01 | 2016-11-09 | 北京新能源汽车股份有限公司 | Low-voltage storage battery charging control method of electric vehicle and electric vehicle |
| AU2017357736B2 (en) * | 2016-11-10 | 2022-04-21 | Ocean Power Technologies, Inc. | High DC voltage to low DC voltage conversion apparatus including rechargeable batteries |
| CN108725233A (en) * | 2017-04-25 | 2018-11-02 | 郑州宇通客车股份有限公司 | Battery management system and vehicle management system with all the period of time monitoring |
| CN108725233B (en) * | 2017-04-25 | 2023-07-25 | 宇通客车股份有限公司 | Battery management system with full time monitoring and vehicle management system |
| CN108791134B (en) * | 2017-05-04 | 2022-01-04 | 沃尔沃汽车公司 | Battery balancing method |
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| CN108791134A (en) * | 2017-05-04 | 2018-11-13 | 沃尔沃汽车公司 | Battery balance method |
| CN110040016A (en) * | 2018-01-17 | 2019-07-23 | 保时捷股份公司 | Power supply unit for motor vehicles |
| CN110040016B (en) * | 2018-01-17 | 2022-05-13 | 保时捷股份公司 | Power supply device for motor vehicle |
| CN108973903A (en) * | 2018-08-02 | 2018-12-11 | 北京新能源汽车股份有限公司 | Vehicle-mounted power supply system and vehicle |
| CN109861526A (en) * | 2019-02-27 | 2019-06-07 | 中国第一汽车股份有限公司 | The control method of DC/DC |
| CN112477598A (en) * | 2020-12-07 | 2021-03-12 | 安徽江淮汽车集团股份有限公司 | Electric automobile low-voltage system control method, device, equipment and storage medium |
| CN118544881A (en) * | 2024-07-31 | 2024-08-27 | 比亚迪股份有限公司 | Vehicle, control method, device, storage medium and computer program product thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108599553A (en) | 2018-09-28 |
| CN105186858B (en) | 2018-05-29 |
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Inventor after: Lushimin Inventor after: Zhu Hongjun Inventor before: Zhang Ximei |
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Effective date of registration: 20180403 Address after: 221011 Xuzhou Avenue, Xuzhou Industrial Park, Xuzhou, Jiangsu Applicant after: JIANGSU JINPENG VEHICLE Co.,Ltd. Address before: 238000 Anhui province Chaohu City West Health show court garden 14 Building 2 unit 402 Applicant before: Zhang Ximei |
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Address after: 221000 East of Tunshidagou and West of Tunqing Road in Xuzhou Industrial Park, Jiawang District, Xuzhou City, Jiangsu Province (No. 6 Zhongjing 7th Road) Patentee after: Jiangsu Jinpeng Group Co.,Ltd. Address before: 221011 Xuzhou Industrial Park Xuzhou Avenue North, Xuzhou City, Jiangsu Province Patentee before: JIANGSU JINPENG VEHICLE Co.,Ltd. |
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