CN109725631A - A kind of quiescent current test device and vehicle - Google Patents
A kind of quiescent current test device and vehicle Download PDFInfo
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- CN109725631A CN109725631A CN201910066696.0A CN201910066696A CN109725631A CN 109725631 A CN109725631 A CN 109725631A CN 201910066696 A CN201910066696 A CN 201910066696A CN 109725631 A CN109725631 A CN 109725631A
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Abstract
This disclosure relates to a kind of quiescent current test device and vehicle, it include: controller, the controllable voltage source that is connect with the controller, the output end of the controllable voltage source and the input terminal of unit under test connect, the controller is used for the first output voltage by controlling the controllable voltage source, so that the input voltage of the unit under test is met target input voltage, and obtains the quiescent current of the unit under test when the input voltage of the unit under test meets the target input voltage.The first output voltage of controllable voltage source is controlled by controller, the input voltage of unit under test is set to meet target input voltage, it can compensate for influence of the cable resistance to the input voltage of unit under test in test loop in this way, the input voltage of unit under test is set to meet the test request of target input voltage, to guarantee the accuracy of the quiescent current test of unit under test.
Description
Technical field
This disclosure relates to quiescent current measuring technology, and in particular, to a kind of quiescent current test device and vehicle.
Background technique
As electric car automation, intelligence degree improve, multi-functional ECU (Electronic Control Unit,
Electronic control unit) it is mounted on the different location of automobile, for realizing different control functions.In the engine misses of vehicle
After, each electric component is in suspend mode or standby mode, but the ECU of some functional modules, there is still a need for power supply, ECU exists static
The test of electric current, the quiescent current is all significant to entire vehicle design, Performance Evaluation and maintenance.
In the prior art, quiescent current is tested by multimeter, current clamp or quiescent current test equipment etc.
, after during the test being connected each testing element by cable, then the quiescent current of ECU is tested.Due to cable
With certain impedance, it is equivalent to the resistance for cable of having connected in test loop, the input voltage of quiescent current is made to deviate mesh
Input voltage is marked, the accuracy of quiescent current test is influenced.But in the test process of the prior art, electricity is but neglected
The influence that cable resistance tests quiescent current, so that the test result of quiescent current is with its true value, there are biggish deviations.
Summary of the invention
For the defect of the customer service above problem, purpose of this disclosure is to provide a kind of quiescent current test device and vehicles.
To achieve the goals above, the disclosure provides a kind of quiescent current test device, comprising: controller and the control
The controllable voltage source of device connection processed, the output end of the controllable voltage source and the input terminal of unit under test connect, the controller
For the first output voltage by controlling the controllable voltage source, the input voltage of the unit under test is made to meet target input
Voltage, and obtain when the input voltage of the unit under test meets the target input voltage Static Electro of the unit under test
Stream.
It optionally, further include voltage collection circuit, the input of one end of the voltage collection circuit and the unit under test
End connection, the other end of the voltage collection circuit are connect with the controller, and the voltage collection circuit is described for obtaining
The input voltage of unit under test, the controller be used to according to the input voltage determine control parameter, and according to the control
The input voltage of unit under test described in state modulator is the target input voltage.
It optionally, further include the current sampling circuit being connect with the output end of the controller and the unit under test, institute
It states current sampling circuit and obtains institute according to the current parameters for obtaining the current parameters of the unit under test, the controller
State the quiescent current of unit under test.
Optionally, the current sampling circuit includes the sample resistance connecting with the output end of the unit under test, described
Current parameters include the second output voltage and the sample resistance of the sample resistance.
Optionally, the controller connects programme-controlled gain circuit, the programme-controlled gain circuit with the current sampling circuit
Third output voltage is obtained for amplifying/reducing second output voltage according to presupposition multiple, the controller is in sampling institute
After stating third output voltage, the third output voltage is reduced/enlarged according to the presupposition multiple, makes the third output voltage
Be converted to second output voltage.
Optionally, the testing range in the controller equipped with the quiescent current and the corresponding of the presupposition multiple are closed
System；The controller determines the corresponding mesh of the quiescent current when determining that the quiescent current is not belonging to current testing range
Testing range is marked, using the target detection range as the current testing range, and according to corresponding relationship determination
The corresponding presupposition multiple of target detection range controls programme-controlled gain circuit according to the presupposition multiple and amplifies/reduce described second
Output voltage.
Optionally, the controller is determining that the quiescent current is more than the current testing range, alternatively, determining
Quiescent current is stated in the current testing range, and when there are any testing ranges in the current testing range, determined
The quiescent current is not belonging to the current testing range；
The controller will meet the following conditions when determining that the quiescent current is not belonging to the current testing range
Testing range is as the target detection range: the quiescent current is in the testing range, and the testing range is to remove
The testing range of minimum zone except the current testing range.
Optionally, the unit under test includes the electronic control unit ECU of vehicle.
Optionally, the input terminal of the controllable voltage source is connected with power supply.
According to the second aspect of an embodiment of the present disclosure, a kind of vehicle is provided, including described in embodiment of the present disclosure first aspect
A kind of quiescent current test device.
Through the above technical solutions, the test device includes: controller, the controllable voltage source that connect with the controller, it should
The input terminal of the output end of controllable voltage source and unit under test connects, the controller be used for by control the controllable voltage source the
One output voltage makes the input voltage of the unit under test meet target input voltage, and full in the input voltage of the unit under test
The quiescent current of the unit under test is obtained when the foot target input voltage.
According to the test device, the first output voltage of controllable voltage source is controlled by controller, makes the defeated of unit under test
Enter voltage and meet target input voltage, can compensate in test loop cable resistance in this way to the shadow of the input voltage of unit under test
It rings, so that the input voltage of unit under test is met the test request of target input voltage, to guarantee the quiescent current of unit under test
The accuracy of test.
Other feature and advantage of the disclosure will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is and to constitute part of specification for providing further understanding of the disclosure, with following tool
Body embodiment is used to explain the disclosure together, but does not constitute the limitation to the disclosure.In the accompanying drawings:
Fig. 1 is a kind of block diagram of quiescent current test device shown according to an exemplary embodiment；
Fig. 2 is the block diagram of another quiescent current test device shown according to an exemplary embodiment；
Fig. 3 is the block diagram of the third quiescent current test device shown according to an exemplary embodiment；
Fig. 4 is the block diagram of the 4th kind of quiescent current test device shown according to an exemplary embodiment.
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the disclosure.It should be understood that this place is retouched
The specific embodiment stated is only used for describing and explaining the disclosure, is not limited to the disclosure.
Vehicle is after flame-out parking, and each electric component is in suspend mode or standby mode, but the ECU of some functional modules is still
It needs to power, such as antitheft, monitoring, electronic clock, automatic seat functional module, these ECU to power for a long time have centainly quiet
State electric current.
Due to the presence of quiescent current in ECU, power supply (such as battery) over-discharge of vehicle is sometimes resulted in, is led
Cause vehicle that cannot start.Therefore, the test of the quiescent current of vehicle ECU has entire vehicle design, Performance Evaluation and maintenance important
Meaning.
In the prior art, quiescent current is tested by multimeter, current clamp or quiescent current test equipment etc.
, after during the test being connected each testing element by cable, then the quiescent current of ECU is tested.Due to cable
With certain impedance, it is equivalent to the resistance for cable of having connected in test loop, the input voltage of quiescent current is made to deviate mesh
Input voltage is marked, the accuracy of quiescent current test is influenced.But in the test process of the prior art, electricity is but neglected
The influence that cable resistance tests quiescent current, so that the test result of quiescent current is with its true value, there are biggish deviations.
For the test for solving quiescent current in the prior art, the influence of cable resistance is not considered, keeps test result inaccurate
The problem of, the disclosure provides a kind of quiescent current test device and vehicle, controls the first defeated of controllable voltage source by controller
Voltage out, makes the input voltage of unit under test meet target input voltage, can compensate for cable resistance pair in test loop in this way
The influence of the input voltage of unit under test makes the input voltage of unit under test meet the test request of target input voltage, thus
Guarantee the accuracy of the quiescent current test of unit under test.
Below by specific embodiment, content of this disclosure is described in detail.
Fig. 1 is a kind of block diagram of quiescent current test device shown according to an exemplary embodiment, as shown in Figure 1, should
The controllable voltage source 2 that test device includes controller 1, is connect with the controller 1, the output end of the controllable voltage source 2 and tested
The input terminal of unit 3 connects, which is used for the first output voltage by controlling the controllable voltage source 2, keeps this tested single
The input voltage of member 3 meets target input voltage, and obtains when the input voltage of the unit under test 3 meets the target input voltage
Take the quiescent current of the unit under test 3.
Wherein, which may include the ECU (Electronic Control Unit, electronic control unit) of vehicle,
The first output voltage that controllable voltage source is controlled by controller, makes the input voltage of ECU meet target input voltage, such energy
Influence of the resistance of cable in quiescent current test loop to ECU input voltage is enough compensated, the input voltage of ECU is made to meet target
The test request of input voltage, to guarantee the accuracy of ECU quiescent current test.
One kind is possible to be achieved in that, as shown in Fig. 2, the test device further includes voltage collection circuit 4, which is adopted
One end of collector 4 is connect with the input terminal of the unit under test 3, and the other end of the voltage collection circuit 4 and the controller 1 connect
It connects, which is used to obtain the input voltage of the unit under test 3, which is used for true according to the input voltage
Determine control parameter, and is the target input voltage according to the input voltage that the control parameter controls the unit under test 3.
Wherein, which may include DC-DC converter (Direct current-Direct current
Converter), which may include PWM (Pulse Width Modulation, pulse width modulation), illustratively, control
Device processed obtains the input voltage of unit under test, and the input voltage and goal-selling input voltage are compared, voltage difference is obtained,
PWM is generated according to the voltage difference, the output voltage of DC-DC converter is controlled by the PWM, makes the input voltage of unit under test
Target input voltage.
As shown in figure 3, the test device further includes the electric current connecting with the output end of the controller 1 and the unit under test 3
Sample circuit 5, the current sampling circuit 5 are used to obtain the current parameters of the unit under test 3, which joins according to the electric current
Number obtains the quiescent current of the unit under test 3.
Optionally, which includes the sample resistance connecting with the output end of the unit under test, electric current ginseng
Number includes the second output voltage and the sample resistance of the sample resistance.According to the second output voltage be equal to sample resistance multiplied by
The relationship of quiescent current then can determine the quiescent current of unit under test.
The quiescent current of usual ECU is smaller, is microampere order or milliampere grade electric current, correspondingly, sample resistance answers root
It is arranged according to the size of quiescent current, cannot be arranged excessive, resistance value is bigger, and the impedance of sample resistance also can be bigger, and impedance takes more greatly
The quiescent current that sample resistance flows through will reduce, and eventually lead to quiescent current test inaccuracy.
The quiescent current of different ECU output is not also identical on vehicle, also different from the sample resistance of ECU connection, in this way
Second output voltage also can be different.But the sampling range of the second output voltage of usual controller setting be it is fixed, if second
Output voltage is not within the scope of the sampling, then controller cannot sample the second output voltage, cannot finally test the static state of ECU
Electric current reduces the sampling precision of controller alternatively, the second output voltage is too small, also will affect the standard of ECU quiescent current test
True property.
In order to enable the sampling range of controller to sample the second different output voltages, and can guarantee to sample
One kind of precision is possible to be achieved in that, as shown in figure 4, the controller 1 and the current sampling circuit 5 connection programme-controlled gain electricity
Road 6, the programme-controlled gain circuit 6 obtain third output voltage for amplifying/reducing second output voltage according to presupposition multiple, should
Controller 1 reduces/enlarges the third output voltage according to the presupposition multiple, makes the third after sampling the third output voltage
Output voltage is converted to second output voltage.
In this way, the second output voltage be more than controller sampling range when, can by control programme-controlled gain circuit according to
Presupposition multiple reduces the second output voltage and obtains third output voltage, makes third output voltage within the scope of the sampling of controller,
To realize the sampling to the second output voltage.
Equally, if the second output voltage is within the scope of the sampling of controller, but the value of second output voltage is too small, control
Device processed cannot accurately sample the second output voltage, such as, it is assumed that the sampling range of controller is 0~1V, and the second output voltage is
When 0.01V, the sampling precision of controller is reduced, then it is second defeated to amplify this according to presupposition multiple by control programme-controlled gain circuit
Voltage out improves the sampling precision of controller, to improve the accuracy of quiescent current test.
In conclusion controlling programme-controlled gain circuit by controller amplifies/reduces the second output voltage according to presupposition multiple,
To meet the sampling range of controller, so as to test the quiescent current of different unit under tests, simultaneously, additionally it is possible to improve control
The sampling precision of device.
The corresponding relationship of testing range and the presupposition multiple in the controller equipped with the quiescent current；The controller is true
When the fixed quiescent current is not belonging to current testing range, determines the corresponding target detection range of the quiescent current, which is surveyed
It tries range and determines the corresponding presupposition multiple of target detection range as the current testing range, and according to the corresponding relationship, control
Processing procedure control gain circuitry amplifies/reduces second output voltage according to the presupposition multiple.
Wherein, which is determining that the quiescent current is more than the current testing range, alternatively, determining the quiescent current
In this prior in testing range, and when there are in any testing range in this prior testing range, determine that the quiescent current does not belong to
In the current testing range；
The controller will meet the test volume of the following conditions when determining that the quiescent current is not belonging to the current testing range
The Cheng Zuowei target detection range: the quiescent current is in the testing range, and the testing range is except the current testing range
Except minimum zone testing range.
Illustratively, the testing range of the quiescent current and the corresponding relationship of presupposition multiple can be according to the sampling models of controller
It encloses, the determination of sample resistance and quiescent current=second output voltage/sample resistance relationship, first by the second output voltage
Range and sampling range, determine the second output voltage amplification/diminution presupposition multiple, make third output voltage in the sampling range
It is interior, it later, can determine the testing range of quiescent current according to the range of the second output voltage and sample resistance, finally obtain test
The corresponding relationship of range and presupposition multiple.
By above-mentioned relation formula it is found that when sample resistance immobilizes, by the second output voltage according to presupposition multiple amplification/
It reduces, while meeting the sampling range of controller, correspondingly, quiescent current will suffice for current testing range.
And because it is quiescent current that controller is finally obtained, whether quiescent current belongs to current testing range can be intuitive
Ground is shown, and the second output voltage is the intermediate quantity of determining quiescent current, and whether the second output voltage belongs to controller
Sampling range is not easy to intuitively show.It therefore, can be by judging whether quiescent current belongs to current testing range, to adjust
The presupposition multiple of whole second output voltage amplification/diminution, the second output voltage after making amplification/diminution meet the sampling of controller
Range.
Assuming that the sampling range of controller is 0~1V, sample resistance is 1K Ω, the correspondence of the testing range and presupposition multiple
Relationship is represented by table 1.
The corresponding relationship of table 1 testing range and presupposition multiple
| Second output voltage | Presupposition multiple | Testing range |
| 0~1V | 1 | 0~1mA |
| 0~5V | 5 | 0~5mA |
| 0~10V | 10 | 0~10mA |
| 0~20V | 20 | 0~20mA |
For example, the sampling range of controller is 0~1V when the second output voltage is 0~1V, then presupposition multiple can be set
It is 1, and sample resistance is 1K Ω, then can determine that the testing range of quiescent current is 0~1mA.For another example, the second output voltage is 0
Second output voltage need to be reduced 5 times, just be able to satisfy the sampling range of controller, be 1K Ω according to sample resistance, then may be used by~5V
The testing range for determining quiescent current is 0~5mA.
It can judge whether quiescent current belongs to current testing range according to table 1, adjust the second output voltage amplification/diminution
Presupposition multiple.For example, when quiescent current is 1.2mA, which is more than current test if current testing range is 0~1mA
Range, therefore the quiescent current is not belonging to the current testing range, correspondingly, the second output voltage amplifies according to presupposition multiple 1
Afterwards, the tertiary voltage obtained is also discontented with the sampling range of foot controls.It then needs to test from 0~5mA, 0~10mA and 0~20mA
Target detection range is determined in range, compares above three testing range it is found that the quiescent current is in 0~5mA testing range,
And be range reckling in above-mentioned three, accordingly, it is determined that 0~5mA testing range is target detection range, by current testing range
It is changed to 0~5mA.Controller controls programme-controlled gain circuit and reduces second according to the corresponding presupposition multiple 5 of 0~5mA testing range
Output voltage can make third output voltage meet the sampling range of controller.
For another example, if current testing range is 0~5mA, when quiescent current is 0.1mA, the quiescent current is in current test volume
In journey, but in 0~1mA, 0~10mA and 0~20mA testing range, there are 0~1mA testing ranges in 0~5mA range
Interior, then the quiescent current is not belonging to current testing range, correspondingly, also illustrates programme-controlled gain circuit according to current testing range
The second output voltage of 5 amplifications of presupposition multiple/diminution, it is also possible to keep third output voltage too small, adopting for controller can be reduced
Sample precision.Therefore, target detection range can be determined out of 0~1mA, 0~10mA and 0~20mA testing range, compare three's survey
Trying 0~1mA known to range is range reckling in testing range, and the quiescent current is within the scope of 0~1mA, accordingly, it is determined that 0
~1mA is target detection range, and it is 1 that controller, which controls programme-controlled gain circuit according to the corresponding presupposition multiple of 0~1mA testing range,
The second output voltage of amplification/diminution while third output voltage can be made to meet the sampling range of controller, improves sampling essence
Degree.
Optionally, the input terminal of the controllable voltage source is connected with power supply, which may include battery.
The disclosure also provides a kind of vehicle, including quiescent current test device described above.
The preferred embodiment of the disclosure is described in detail in conjunction with attached drawing above, still, the disclosure is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the disclosure, a variety of letters can be carried out to the technical solution of the disclosure
Monotropic type, these simple variants belong to the protection scope of the disclosure.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the disclosure to it is various can
No further explanation will be given for the combination of energy.
In addition, any combination can also be carried out between a variety of different embodiments of the disclosure, as long as it is without prejudice to originally
Disclosed thought equally should be considered as disclosure disclosure of that.
Claims (10)
1. a kind of quiescent current test device characterized by comprising controller, the controllable voltage being connect with the controller
Source, the output end of the controllable voltage source and the input terminal of unit under test connect, and the controller is used to pass through can described in control
The first output voltage for controlling voltage source makes the input voltage of the unit under test meet target input voltage, and described tested
The input voltage of unit obtains the quiescent current of the unit under test when meeting the target input voltage.
2. quiescent current test device according to claim 1, which is characterized in that it further include voltage collection circuit, it is described
One end of voltage collection circuit is connect with the input terminal of the unit under test, the other end of the voltage collection circuit and the control
Device connection processed, the voltage collection circuit are used to obtain the input voltage of the unit under test, and the controller is used for according to institute
It states input voltage and determines control parameter, and be the target according to the input voltage that the control parameter controls the unit under test
Input voltage.
3. quiescent current test device according to claim 1 or 2, which is characterized in that further include with the controller and
The current sampling circuit of the output end connection of the unit under test, the current sampling circuit is for obtaining the unit under test
Current parameters, the controller obtain the quiescent current of the unit under test according to the current parameters.
4. quiescent current test device according to claim 3, which is characterized in that the current sampling circuit includes and institute
State the sample resistance of the output end connection of unit under test, the current parameters include the second output voltage of the sample resistance with
And the sample resistance.
5. quiescent current test device according to claim 4, which is characterized in that the controller and the current sampling
Circuit connection programme-controlled gain circuit, the programme-controlled gain circuit are used to amplify/reduce according to presupposition multiple the second output electricity
Pressure obtains third output voltage, and the controller is reduced/put according to the presupposition multiple after sampling the third output voltage
The big third output voltage, makes the third output voltage be converted to second output voltage.
6. quiescent current test device according to claim 5, which is characterized in that be equipped with the static state in the controller
The corresponding relationship of the testing range of electric current and the presupposition multiple；The controller is determining that the quiescent current is not belonging to currently
When testing range, the corresponding target detection range of the quiescent current is determined, using the target detection range as described current
Testing range, and the corresponding presupposition multiple of the target detection range, control programme-controlled gain electricity are determined according to the corresponding relationship
Amplify/reduce second output voltage according to the presupposition multiple in road.
7. quiescent current test device according to claim 6, which is characterized in that the controller is determining the static state
Electric current be more than the current testing range, alternatively, determine the quiescent current in the current testing range, and exist appoint
When one testing range is in the current testing range, determine that the quiescent current is not belonging to the current testing range；
The controller will meet the test of the following conditions when determining that the quiescent current is not belonging to the current testing range
Range is as the target detection range: the quiescent current is in the testing range, and the testing range is except described
The testing range of minimum zone except current testing range.
8. quiescent current test device according to claim 7, which is characterized in that the unit under test includes the electricity of vehicle
Sub-control unit ECU.
9. quiescent current test device according to claim 8, which is characterized in that the input terminal of the controllable voltage source connects
It is connected to power supply.
10. a kind of vehicle, which is characterized in that including the described in any item quiescent current test devices of claim 1 to 9.
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| CN108919009A (en) * | 2018-07-16 | 2018-11-30 | 江苏特创科技有限公司 | A kind of vehicle electronic device test device and its test macro |
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| CN109725631B (en) | 2021-10-29 |
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