CN104678179A - Measurement for internal resistance of automobile storage battery - Google Patents
Measurement for internal resistance of automobile storage battery Download PDFInfo
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- CN104678179A CN104678179A CN201310626031.3A CN201310626031A CN104678179A CN 104678179 A CN104678179 A CN 104678179A CN 201310626031 A CN201310626031 A CN 201310626031A CN 104678179 A CN104678179 A CN 104678179A
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- storage battery
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Abstract
The invention relates to the technology of automotive electronics, in particular to a method for measuring the internal resistance of an automobile storage battery and an automobile power management unit for realizing the method. The method for measuring the internal resistance of the automobile storage battery comprises the following steps: by responding to a tail-off event, enabling the automobile storage battery to start supplying power to an engine cooling fan; measuring voltage of two ends of the automobile storage battery and current flowing out of the automobile storage battery under different gears of the engine cooling fan; determining the internal resistance of the automobile storage battery according to the measured voltage and current.
Description
Technical field
The present invention relates to automotive electronic technology, particularly a kind of measured automobiles accumulator internal resistance method and realize the vehicle power management unit of the method.
Background technology
The method measuring the internal resistance of cell is a lot.What extensive people used at present mainly contains direct-current discharge internal resistance measurement method, alternating current bridge method etc.In direct-current discharge internal resistance measurement method, testing apparatus makes a DC current (at present the general big current using 40A-80A) by battery, then measure the voltage at battery two ends and calculate the internal resistance of cell thus.Battery is equivalent to an active pull-up by alternating current bridge method, it applies a fixed frequency and fixed current (general use 1kHZ frequency at present at battery two ends, 50mA small area analysis) and voltage is sampled, after a series of process such as overcommutation, filtering, the internal resistance value of this battery is calculated by operational amplification circuit.When exchanging the battery measurement of pressure drop internal resistance measurement method, compole is short, generally at about 100ms.
Due to the ripple current on automobile impact and lack suitable AC power, generally utilize now the big current starting moment for the measuring technology of automobile storage battery internal resistance.Fig. 1 shows the circuit theory diagrams typically utilizing direct-current discharge method measured automobiles accumulator internal resistance.As shown in Figure 1, voltage table U and automobile storage battery B is connected in parallel, the two ends of automobile storage battery B are connected in parallel on after reometer A and starter S is connected in series, the steady current that starter produces flows through automobile storage battery B, and the voltage at automobile storage battery B two ends and the electric current flowing through automobile storage battery B are measured by voltage table U and reometer A respectively.
Although adopt direct-current discharge method can obtain higher measuring accuracy, need to provide large steady current specially.
Summary of the invention
The object of this invention is to provide a kind of method of measured automobiles accumulator internal resistance, it has and realizes easy and measuring accuracy advantages of higher.
Above-mentioned purpose of the present invention realizes by following technical proposal:
A method for measured automobiles accumulator internal resistance, comprises the following steps:
In response to the event of tail-off, described automobile storage battery is made to start to power to cooling fan of engine;
Under the different gears of described cooling fan of engine, measure the voltage at described automobile storage battery two ends and flow out the electric current of described automobile storage battery; And
The internal resistance of described automobile storage battery is determined according to the voltage and current recorded.
Preferably, in the above-mentioned methods, the step measuring described voltage and current comprises:
Described cooling fan of engine is made to run first preset period of time under the first gear;
Described voltage and current is measured in this first preset period of time;
Described cooling fan of engine is made to run second preset period of time under the second gear;
Described voltage and current is measured in this second preset period of time.
Preferably, in the above-mentioned methods, determined the internal resistance of described automobile storage battery by following formula according to the voltage and current recorded:
Here, r is automobile storage battery internal resistance, U
1and U
2be respectively the voltage at automobile storage battery two ends when cooling fan of engine operates in the first and second gears, I
1and I
2be respectively the electric current flowing out automobile storage battery when cooling fan of engine operates in the first and second gears.
Preferably, in the above-mentioned methods, the step measuring described voltage and current comprises:
Described cooling fan of engine is made to run first preset period of time under the first gear;
Described voltage and current is measured in this first preset period of time;
Described cooling fan of engine is made to run second preset period of time under the second gear;
Described voltage and current is measured in this second preset period of time;
Described cooling fan of engine is made to run first preset period of time under the first gear;
Described voltage and current is measured in this first preset period of time.
Preferably, in the above-mentioned methods, determine the internal resistance of described automobile storage battery according to the voltage and current recorded according to following manner:
The first internal resistance of described automobile storage battery is determined by following formula:
Here, r
1for the first internal resistance of automobile storage battery, U
11and I
11for automobile storage battery two ends when cooling fan of engine first time operates in the first gear voltage and flow out the electric current of automobile storage battery, U
12and I
12be respectively the voltage at automobile storage battery two ends when cooling fan of engine operates in the second gear and flow out the electric current of automobile storage battery;
The second internal resistance of described automobile storage battery is determined by following formula:
Here, r
2for the second internal resistance of automobile storage battery, U
13and I
13for automobile storage battery two ends when cooling fan of engine second time operates in the first gear voltage and flow out the electric current of automobile storage battery;
To the first and second internal resistance r
1and r
2average the internal resistance determining described automobile storage battery.
Preferably, in the above-mentioned methods, described voltage and current is the mean value of the measured value in described first preset period of time and the second preset period of time.
Of the present invention also have an object to be to provide a kind of vehicle power management unit realizing said method.
According to one embodiment of the present of invention, vehicle power management unit comprises:
Communication interface, it is configured to and external device communication;
The processor be coupled with described communication interface, it is configured to:
When receiving the message of tail-off through described communication interface from engine controller, indicate described engine controller that cooling fan of engine is run under different gears, and through described communication interface receiving sensor group record run under different gears time automobile storage battery two ends voltage and flow out the electric current of described automobile storage battery, and determine the internal resistance of described automobile storage battery according to the voltage and current recorded.
Preferably, in above-mentioned vehicle power management unit, described processor indicates described engine controller that cooling fan of engine is run according to following modes: first under the first gear, run first preset period of time, under the second gear, run second preset period of time subsequently, and described processor is configured to the internal resistance determining described automobile storage battery according to following manner:
Here, r is automobile storage battery internal resistance, U
1and U
2be respectively the voltage at automobile storage battery two ends when cooling fan of engine operates in the first and second gears, I
1and I
2be respectively the electric current flowing out automobile storage battery when cooling fan of engine operates in the first and second gears.
Preferably, in above-mentioned vehicle power management unit, described processor indicates described engine controller that cooling fan of engine is run according to following modes: first under the first gear, run first preset period of time, second preset period of time is run subsequently under the second gear, last operation first preset period of time under the first gear again, and described processor is configured to the internal resistance determining described automobile storage battery according to following manner:
r＝(r
1+r
2)/2
Here, r
1for the first internal resistance of automobile storage battery, U
11and I
11for automobile storage battery two ends when cooling fan of engine first time operates in the first gear voltage and flow out the electric current of automobile storage battery, U
12and I
12be respectively the voltage at automobile storage battery two ends when cooling fan of engine operates in the second gear and flow out the electric current of automobile storage battery, r
2for the second internal resistance of automobile storage battery, U
13and I
13for automobile storage battery two ends when cooling fan of engine second time operates in the first gear voltage and flow out the electric current of automobile storage battery, r is the internal resistance of described automobile storage battery.
Preferably, in above-mentioned vehicle power management unit, described communication interface through LIN bus and described sensor group communication, and communicates with described engine controller through CAN.
Accompanying drawing explanation
Description by the various aspects below in conjunction with accompanying drawing is become more clear and is easier to understand by above-mentioned and/or other side of the present invention and advantage, and in accompanying drawing, same or analogous unit adopts identical label to represent, accompanying drawing comprises:
Fig. 1 shows the circuit theory diagrams typically utilizing direct-current discharge method to measure the internal resistance of cell.
Fig. 2 shows and measures the circuit theory diagrams of the internal resistance of cell according to the direct-current discharge method that utilizes of one embodiment of the invention.
Fig. 3 is the schematic block diagram of the vehicle power management unit according to one embodiment of the invention.
Fig. 4 is the process flow diagram of the method for measured automobiles accumulator internal resistance according to an invention embodiment.
Embodiment
Below by embodiment being described with reference to the drawings to set forth the present invention.But it is to be appreciated that these embodiments are only exemplary, restriction be there is no for spirit of the present invention and protection domain.
In this manual, " connection " one word to should be understood to be included between two unit the situation directly transmitting energy or signal, or indirectly transmit the situation of energy or signal through one or more Unit the 3rd, and alleged signal includes but not limited to the signal of the form of electricity, light and magnetic existence here.
" comprise " and the term of " comprising " and so on represents except having the unit and step that have in the specification and in the claims directly and clearly state, technical scheme of the present invention does not get rid of the situation had not by other unit of directly or clearly stating and step yet.
Automobile is after each shutdown is flame-out, and engine is in the condition of high temperature.In order to prevent heat diffusion to O-ring seal and other working of plastics thus cause component failure, flame-out rear engine cooling fan can about continuous firing 5-20 second.Cooling fan of engine is now main or even unique power supply object of automobile storage battery and supply current substantial constant, and this is that the measurement of automobile storage battery internal resistance provides unrivalled opportunity.Cooling fan of engine generally has multiple operation range, each gear corresponds to a constant working current, therefore can obtain the voltage and current of automobile storage battery in different loads condition by switching between multiple gear, thus calculate the internal resistance of automobile storage battery.It is emphasized that owing to opening cooling fan of engine be an indispensable operation, therefore the present invention is without the need to being measured automobiles accumulator internal resistance and provide constant electric current specially.
By accompanying drawing, specific embodiments of the invention are described below.
Fig. 2 shows and measures the circuit theory diagrams of the internal resistance of cell according to the direct-current discharge method that utilizes of one embodiment of the invention.As shown in Figure 2, be connected in parallel at voltage table U and automobile storage battery B, the two ends of automobile storage battery B are connected in parallel on after reometer A and cooling fan of engine F is connected in series, when cooling fan of engine F is operated in different gears, utilize voltage table U and reometer A respectively measured automobiles accumulator B two ends voltage and flow through the electric current of automobile storage battery B.
In one embodiment of the invention, utilize voltage and current under cooling fan of engine F two gears to obtain the internal resistance of automobile storage battery.Below this is further described.
First make cooling fan of engine F under the first gear, run first preset period of time and the voltage and current measured in this period, then make cooling fan of engine run second preset period of time under the second gear and measure the voltage and current within this period.After obtaining above-mentioned two groups of voltage and current measured values, following formula is utilized to calculate the internal resistance of automobile storage battery:
Wherein, r is automobile storage battery internal resistance, U
1and I
1for automobile storage battery two ends when cooling fan of engine operates in the first gear voltage and flow out the electric current of automobile storage battery, U
2and I
2be respectively the voltage at automobile storage battery two ends when cooling fan of engine operates in the second gear and flow out the electric current of automobile storage battery.
In another embodiment of the present invention, utilize three groups of voltage and currents to obtain the internal resistance of automobile storage battery.Below this is further described.
First cooling fan of engine F is made under the first gear, to run first preset period of time and the voltage and current measured in this period, then make cooling fan of engine run second preset period of time under the second gear and measure the voltage and current within this period, finally again making cooling fan of engine under the first gear, run first preset period of time and the voltage and current measured in this period.After obtaining above-mentioned three groups of voltage and current measured values, following formula is utilized to calculate the internal resistance of automobile storage battery:
Here, r
1for automobile storage battery internal resistance, U
11and I
11for automobile storage battery two ends when cooling fan of engine first time operates in the first gear voltage and flow out the electric current of automobile storage battery, U
12and I
12be respectively the voltage at automobile storage battery two ends when cooling fan of engine operates in the second gear and flow out the electric current of automobile storage battery.
Here, r
2for automobile storage battery internal resistance, U
13and I
13for automobile storage battery two ends when cooling fan of engine second time operates in the first gear voltage and flow out the electric current of automobile storage battery.
r＝(r
1+r
2)/2 （4）
Here r is the internal resistance of the automobile storage battery finally obtained, and it equals internal resistance r
1and r
2mean value.
Adopt the mode of the first gear-the second gear-the first gear while not affecting cooling effect, the impact on internal resistance measuring accuracy because of the decline of automobile storage battery SOC value can be eliminated to obtain automobile storage battery internal resistance.
In above formula (1)-(4), voltage and current is the mean value of the measured value in the period.In addition, above-mentioned first and second periods can be identical or different.
Fig. 3 is the schematic block diagram of the vehicle power management unit according to one embodiment of the invention, and this vehicle power management unit can realize above-mentioned measuring principle of the present invention.
Vehicle power management unit 10 shown in Fig. 3 comprises communication interface 110, dynamic RAM 120A, nonvolatile memory 120B and processor 130.
Communication interface 110 is coupled with the sensor group 20 and engine controller 30 being positioned at vehicle power management unit 10 outside.Preferably, communication interface 110 and sensor group by LIN bus communication, and are communicated with engine controller 30 by CAN.Sensor group 20 such as includes but not limited to automobile storage battery voltage sensor group, automobile storage battery current sensor group and automobile storage battery sets of temperature sensors.
Processor 130 is coupled with communication interface 110, dynamic RAM 120A, nonvolatile memory 120B, as the core cell of vehicle power management unit 10, it performs the control program stored in nonvolatile memory 120B, calculates the internal resistance of automobile storage battery B according to communication unit 110 from the measuring-signal that sensor group 20 receives.
The principle of work of automobile electronic controller shown in Fig. 3 is below described.
When the processor 130 of vehicle power management unit 10 powers up startup, control program is loaded in dynamic RAM 120A by it from nonvolatile memory 120B.
When communication interface 110 receives the message of tail-off from engine controller 30, processor 130 indicates engine controller 30 to control cooling fan of engine 40 according to mode recited above through communication interface 110, makes it run under different gears.Meanwhile, processor 130 through communication interface 110 receiving sensor group 20 record run under different gear time automobile storage battery B two ends voltage and flow out the electric current of automobile storage battery B.After obtaining required many groups voltage and current data, processor 130 is according to the internal resistance of mode determination automobile storage battery B recited above.
Fig. 4 is the process flow diagram of the method for measured automobiles accumulator internal resistance according to an invention embodiment.
For setting forth conveniently, hypothesis utilizes the vehicle power management unit shown in Fig. 3 to realize the method for the present embodiment here.But it is pointed out that principle of the present invention is not limited to the opertaing device of particular type and structure.
As shown in Figure 4, in step S401, whether communication interface 110 receives tail-off message from engine controller 30 monitored by processor 130, if received, then enters step S402, otherwise continue monitoring.
In step S402, processor 130 sends control command through communication interface 110 to engine controller 30, indicates it to control cooling fan of engine 40, works to make cooling fan of engine 40 according to specific mode.Meanwhile, the voltage at sensor group 30 pairs of automobile storage battery B two ends and the electric current of outflow automobile storage battery B are measured.Specific mode described here can be the mode that cooling fan of engine 40 runs under different gears according to pattern recited above, such as cooling fan of engine runs first preset period of time under the first gear, then under the second gear, runs second preset period of time; Or cooling fan of engine runs first preset period of time under the first gear, then under the second gear, run second preset period of time, finally again under the first gear, run first preset period of time.It is worthy of note, pattern recited above is only exemplary, and other in fact can also be had to obtain the pattern of many group voltage and current data.
Then enter step S403, processor 130 receives many group voltage and current data through communication interface 110 from sensor group 20.
Enter step S404 subsequently, processor 130 calculates the internal resistance of automobile storage battery according to the many groups voltage and current data received.The computing method of automobile storage battery internal resistance describe existing above, repeat no more herein.
Although represented and discussed aspects more of the present invention, but those skilled in the art it is appreciated that and can change in above-mentioned under the condition not deviating from the principle of the invention and spirit, and therefore scope of the present invention limited by claim and equivalent content.
Claims (10)
1. a method for measured automobiles accumulator internal resistance, is characterized in that, comprises the following steps:
In response to the event of tail-off, described automobile storage battery is made to start to power to cooling fan of engine;
Under the different gears of described cooling fan of engine, measure the voltage at described automobile storage battery two ends and flow out the electric current of described automobile storage battery; And
The internal resistance of described automobile storage battery is determined according to the voltage and current recorded.
2. the method for measured automobiles accumulator internal resistance as claimed in claim 1, wherein, the step measuring described voltage and current comprises:
Described cooling fan of engine is made to run first preset period of time under the first gear;
Described voltage and current is measured in this first preset period of time;
Described cooling fan of engine is made to run second preset period of time under the second gear;
Described voltage and current is measured in this second preset period of time.
3. the method for measured automobiles accumulator internal resistance as claimed in claim 2, wherein, determined the internal resistance of described automobile storage battery by following formula according to the voltage and current recorded:
Here, r is automobile storage battery internal resistance, U
1and U
2be respectively the voltage at automobile storage battery two ends when cooling fan of engine operates in the first and second gears, I
1and I
2be respectively the electric current flowing out automobile storage battery when cooling fan of engine operates in the first and second gears.
4. the method for measured automobiles accumulator internal resistance as claimed in claim 1, wherein, the step measuring described voltage and current comprises:
Described cooling fan of engine is made to run first preset period of time under the first gear;
Described voltage and current is measured in this first preset period of time;
Described cooling fan of engine is made to run second preset period of time under the second gear;
Described voltage and current is measured in this second preset period of time;
Described cooling fan of engine is made to run first preset period of time under the first gear;
Described voltage and current is measured in this first preset period of time.
5. the method for measured automobiles accumulator internal resistance as claimed in claim 4, wherein, determine the internal resistance of described automobile storage battery according to the voltage and current recorded according to following manner:
The first internal resistance of described automobile storage battery is determined by following formula:
Here, r
1for the first internal resistance of automobile storage battery, U
11and I
11for automobile storage battery two ends when cooling fan of engine first time operates in the first gear voltage and flow out the electric current of automobile storage battery, U
12and I
12be respectively the voltage at automobile storage battery two ends when cooling fan of engine operates in the second gear and flow out the electric current of automobile storage battery;
The second internal resistance of described automobile storage battery is determined by following formula:
Here, r
2for the second internal resistance of automobile storage battery, U
13and I
13for automobile storage battery two ends when cooling fan of engine second time operates in the first gear voltage and flow out the electric current of automobile storage battery;
To the first and second internal resistance r
1and r
2average the internal resistance determining described automobile storage battery.
6. the method for the measured automobiles accumulator internal resistance as described in claim 2 or 4, wherein, described voltage and current is the mean value of the measured value in described first preset period of time and the second preset period of time.
7. a vehicle power management unit, is characterized in that, comprising:
Communication interface, it is configured to and external device communication;
The processor be coupled with described communication interface, it is configured to:
When receiving the message of tail-off through described communication interface from engine controller, indicate described engine controller that cooling fan of engine is run under different gears, and through described communication interface receiving sensor group record run under different gears time automobile storage battery two ends voltage and flow out the electric current of described automobile storage battery, and determine the internal resistance of described automobile storage battery according to the voltage and current recorded.
8. vehicle power management unit as claimed in claim 7, wherein, described processor indicates described engine controller that cooling fan of engine is run according to following modes: first under the first gear, run first preset period of time, under the second gear, run second preset period of time subsequently, and described processor is configured to the internal resistance determining described automobile storage battery according to following manner:
Here, r is automobile storage battery internal resistance, U
1and U
2be respectively the voltage at automobile storage battery two ends when cooling fan of engine operates in the first and second gears, I
1and I
2be respectively the electric current flowing out automobile storage battery when cooling fan of engine operates in the first and second gears.
9. vehicle power management unit as claimed in claim 7, wherein, described processor indicates described engine controller that cooling fan of engine is run according to following modes: first under the first gear, run first preset period of time, second preset period of time is run subsequently under the second gear, last operation first preset period of time under the first gear again, and described processor is configured to the internal resistance determining described automobile storage battery according to following manner:
r＝(r
1+r
2)/2
Here, r
1for the first internal resistance of automobile storage battery, U
11and I
11for automobile storage battery two ends when cooling fan of engine first time operates in the first gear voltage and flow out the electric current of automobile storage battery, U
12and I
12be respectively the voltage at automobile storage battery two ends when cooling fan of engine operates in the second gear and flow out the electric current of automobile storage battery, r
2for the second internal resistance of automobile storage battery, U
13and I
13for automobile storage battery two ends when cooling fan of engine second time operates in the first gear voltage and flow out the electric current of automobile storage battery, r is the internal resistance of described automobile storage battery.
10. vehicle power management unit as claimed in claim 8 or 9, wherein, described communication interface through LIN bus and described sensor group communication, and communicates with described engine controller through CAN.
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|---|---|---|---|
| CN201310626031.3A CN104678179A (en) | 2013-11-29 | 2013-11-29 | Measurement for internal resistance of automobile storage battery |
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|---|---|---|---|
| CN201310626031.3A CN104678179A (en) | 2013-11-29 | 2013-11-29 | Measurement for internal resistance of automobile storage battery |
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| CN106546924A (en) * | 2016-10-08 | 2017-03-29 | 浙江大学 | A kind of dynamic prediction method of automobile lithium battery performance |
| CN111781526A (en) * | 2020-07-14 | 2020-10-16 | 深圳市道通科技股份有限公司 | Method and device for detecting vehicle battery and battery detection equipment |
| CN113740744A (en) * | 2021-08-18 | 2021-12-03 | 广州小鹏汽车科技有限公司 | Battery state of health monitoring method and apparatus, vehicle, and storage medium |
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| CN113740744B (en) * | 2021-08-18 | 2023-08-25 | 广州小鹏汽车科技有限公司 | Battery health state monitoring method and device, vehicle and storage medium |
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