CN208459521U - A kind of electric vehicle and its high-pressure-loop detection circuit - Google Patents
A kind of electric vehicle and its high-pressure-loop detection circuit Download PDFInfo
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- CN208459521U CN208459521U CN201821134373.8U CN201821134373U CN208459521U CN 208459521 U CN208459521 U CN 208459521U CN 201821134373 U CN201821134373 U CN 201821134373U CN 208459521 U CN208459521 U CN 208459521U
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Abstract
The utility model provides a kind of electric vehicle and its high-pressure-loop detection circuit, and detection circuit includes controller, constant-current source, detection interface, first resistor and second resistance；The anode of wherein one end connection constant-current source of first resistor, the other end connect the cathode of constant-current source；For detection interface for connecting high-pressure-loop to be measured, the second resistance is in parallel with first resistor with after detection interface tandem；Controller is connected with first voltage detection device and second voltage detection device, first voltage detection device is used to detect the voltage value of first resistor, second voltage detection device is used to detect the voltage value of second resistance, and controller is for judging the state of high-pressure-loop to be measured according to the voltage value of first resistor and the voltage value of second resistance.Technical solution provided by the utility model sends detection signal to the high-pressure-loop of electric vehicle using constant-current source, since constant current source signal is stronger, it is not easy to be influenced by extraneous and parasitic capacitance, so the result of detection is more accurate.
Description
Technical field
The utility model belongs to electric vehicle high-voltage interlocking detection technique field, and in particular to a kind of electric vehicle and its height
Pressure ring alignment detection circuit.
Background technique
In the operational process of electric vehicle, it has been more than human safety voltage, therefore that the voltage of power battery, which is greater than 60V,
In order to ensure the security performance of vehicle, personal injury is not caused to the personnel of vehicle, need to the high-pressure-loop of electric vehicle into
Row real-time monitoring judges whether the connection of high-pressure-loop is abnormal.
The gate oxide integrity of high voltage supply loop is the basis that high-pressure-loop works normally, if the high pressure of high-pressure-loop connects
Being not connected firmly for connector is leaned on, it will causes high-pressure-loop imperfect, high-pressure-loop is caused to can not work normally, can make when serious
At phenomenon of arc discharge, high voltage component damage is caused even to threaten personal safety.
High-voltage interlocking system can be all set on current electric vehicle, and high-voltage interlocking system is provided with detection circuit, detection
Circuit can be acquired the operation data of high-pressure-loop, and according to the integrality of collected data verification high-pressure-loop,
Power battery is allowed to power on for high-tension apparatus if high-pressure-loop connection is normal, otherwise forbidding power battery is on high-tension apparatus
Electricity, to realize the high-voltage interlocking to electric vehicle.When detection circuit detects high-pressure-loop in high-voltage interlocking system, often
Method has:
(1) analog voltage detection method: this method is to export voltage signal all the way to one end of high-voltage interlocking loop, in high pressure
The other end for interlocking loop carries out voltage signal amplitude detection；This detection method is easy to be influenced by output current potential and causes to examine
Results abnormity is surveyed, and detecting voltage signal used is weak signal, is easy to be caused testing result inaccurate by external disturbance.
(2) digital PWM detection method: this method is to export a pwm signal to one end of high-voltage interlocking loop, in high-voltage interlocking
The other end of loop carries out the frequency of PWM and duty ratio detects；This detection method is easy by parasitic capacitance between line and parasitism
The influence of impedance, and cause testing result inaccurate.
Utility model content
It is existing for solving the purpose of this utility model is to provide a kind of electric vehicle and its high-pressure-loop detection circuit
In technology when being detected to high-pressure-loop, as be easy by external interference and caused by testing result inaccuracy asked
Topic.
To achieve the above object, technical solution provided by the utility model is:
A kind of electric vehicle high-pressure-loop detection circuit, including controller, constant-current source, detection interface, first resistor and the
Two resistance；The anode of wherein one end connection constant-current source of the first resistor, the other end connect the cathode of constant-current source；The detection
For interface for connecting high-pressure-loop to be measured, the second resistance is in parallel with first resistor with after detection interface tandem；
The controller is connected with first voltage detection device and second voltage detection device, wherein first voltage detection dress
The voltage value for detecting first resistor is set, second voltage detection device is used to detect the voltage value of second resistance, the control
Device is for judging the state of high-pressure-loop to be measured according to the voltage value of first resistor and the voltage value of second resistance.
Technical solution provided by the utility model sends detection letter to the high-pressure-loop of electric vehicle using constant-current source
Number, and then the state of high-pressure-loop is judged；Since constant current source signal is stronger, it is not easy to by extraneous interference, and
It will not be influenced by parasitic capacitance, so the result of detection is more accurate.
A kind of electric vehicle, including power battery, high-pressure-loop and high-pressure-loop detection circuit；The high-pressure-loop detection
Circuit includes controller, constant-current source, detection interface, first resistor and second resistance；Wherein one end of the first resistor connects
The anode of constant-current source, the other end connect the cathode of constant-current source；The detection interface connects high-pressure-loop, the second resistance and inspection
It is in parallel with first resistor after survey interface tandem；
The controller is connected with first voltage detection device and second voltage detection device, wherein first voltage detection dress
The voltage value for detecting first resistor is set, second voltage detection device is used to detect the voltage value of second resistance, the control
Device is for judging the state of high-pressure-loop according to the voltage value of first resistor and the voltage value of second resistance.
Detailed description of the invention
Fig. 1 is the structure principle chart of vehicle embodiments mesohigh loop detection circuit.
Specific embodiment
It is existing for solving the purpose of this utility model is to provide a kind of electric vehicle and its high-pressure-loop detection circuit
In technology when being detected to high-pressure-loop, as be easy by external interference and caused by testing result inaccuracy asked
Topic.
To achieve the above object, technical solution provided by the utility model is:
A kind of electric vehicle high-pressure-loop detection circuit, including controller, constant-current source, detection interface, first resistor and the
Two resistance；The anode of wherein one end connection constant-current source of the first resistor, the other end connect the cathode of constant-current source；The detection
For interface for connecting high-pressure-loop to be measured, the second resistance is in parallel with first resistor with after detection interface tandem；
The controller is connected with first voltage detection device and second voltage detection device, wherein first voltage detection dress
The voltage value for detecting first resistor is set, second voltage detection device is used to detect the voltage value of second resistance, the control
Device is for judging the state of high-pressure-loop to be measured according to the voltage value of first resistor and the voltage value of second resistance.
The technical solution of the utility model is described further with reference to the accompanying drawing.
Vehicle embodiments:
The present embodiment provides a kind of electric vehicle, which includes power battery, high-pressure-loop and high-pressure-loop inspection
Slowdown monitoring circuit, wherein high-pressure-loop detection circuit is for detecting the state of high-pressure-loop on electric vehicle.
Electric vehicle provided by the present embodiment, high-pressure-loop detection circuit include controller, constant-current source, first resistor,
Second resistance and detection interface.
Constant-current source is equipped with anode and cathode, the anode of wherein one end connection constant-current source of first resistor, other end connection perseverance
The cathode in stream source.
Detect interface includes the end Hvil_op and the end Hvil_in, for connecting the high-pressure-loop of vehicle；Detect interface with
Second resistance is arranged in series, i.e., when the high-pressure-loop for detecting interface and vehicle connects, high-pressure-loop is connected with second resistance and set
It sets.
Detection interface and after second resistance is arranged in series, then be arranged in parallel with first resistor, i.e. detection interface and second electric
It is connected between the positive electrode and negative electrode of constant-current source after resistance series connection, as shown in Figure 1.
Controller is connected with first voltage detection device and second voltage detection device, and the setting of first voltage detection device exists
At first resistor, for detecting the voltage value of first resistor；Second voltage detection device is arranged at second resistance, for detecting
The voltage value of second resistance.Controller is according to the voltage value of first resistor and the voltage value of second resistance, to electric vehicle high pressure
The state of loop is judged.
If the voltage value of first resistor is Udiag, the voltage value of second resistance is Uin, then controller is to electric vehicle height
The method that pressure ring line state is judged are as follows:
When the voltage value Udiag of first resistor is greater than the first setting value Uth1, and the voltage value Uin of second resistance is 0,
It is believed that second resistance does not have electric current, it can be judged as that the high-pressure-loop of vehicle is in an off state；
When the difference of the voltage value Udiag of first resistor and the voltage value Uin of second resistance are less than the second setting value, can recognize
It is in short-circuit condition for the high-pressure-loop of vehicle, can be judged as that the high-pressure-loop of vehicle is in closed state；
It, can when the voltage value Uin of the voltage value Udiag of first resistor and second resistance are unsatisfactory for two kinds of above-mentioned relationships
It is abnormal to be judged as that the high-pressure-loop of vehicle occurs.
The expression of table 1 can be used in above-mentioned decision logic.
Table 1
Use output electric current for the constant-current source of 20mA by constant-current source, constant-current source output be a signal strength compared with
By force and stablize constant current signal；If first resistor is 500R, second resistance 100R, then when high-pressure-loop connection is normal
When, the resistance of circuit is about the Ω=83 of 500 Ω // 100 Ω；If Uth1 is 4.5V, Uth2 1.7V, then when the electricity of first resistor
When pressure value Udiag and the voltage value Uin of second resistance are respectively less than 1.7V, it is believed that the voltage value Udiag of first resistor and second
For the difference of the voltage value Uin of resistance less than the second setting value, the high-pressure-loop of vehicle is in short-circuit condition, at the high-pressure-loop of vehicle
In closed state；When the voltage value Uin of second resistance is greater than 1.7V or the voltage value Udiag of first resistor is less than 1.7V
When, it can determine whether to occur for corresponding voltage check device abnormal.
Circuit embodiments:
The present embodiment provides a kind of electric vehicle high-pressure-loop detection circuits, with the high-pressure-loop in above-mentioned vehicle embodiments
Detection circuit is identical, which is discussed in detail in above-mentioned vehicle embodiments, seldom does here
Explanation.
Claims (2)
1. a kind of electric vehicle high-pressure-loop detection circuit, which is characterized in that including controller, constant-current source, detection interface, first
Resistance and second resistance；The anode of wherein one end connection constant-current source of the first resistor, the other end connect the cathode of constant-current source；
For the detection interface for connecting high-pressure-loop to be measured, the second resistance is in parallel with first resistor with after detection interface tandem；
The controller is connected with first voltage detection device and second voltage detection device, and wherein first voltage detection device is used
In the voltage value of detection first resistor, second voltage detection device is used to detect the voltage value of second resistance, and the controller is used
The state of high-pressure-loop to be measured is judged according to the voltage value of first resistor and the voltage value of second resistance.
2. a kind of electric vehicle, including power battery, high-pressure-loop and high-pressure-loop detection circuit；It is characterized in that, the height
Pressure ring alignment detection circuit includes controller, constant-current source, detection interface, first resistor and second resistance；The first resistor its
The anode of middle one end connection constant-current source, the other end connect the cathode of constant-current source；The detection interface connects high-pressure-loop, and described the
Two resistance are in parallel with first resistor with after detection interface tandem；
The controller is connected with first voltage detection device and second voltage detection device, and wherein first voltage detection device is used
In the voltage value of detection first resistor, second voltage detection device is used to detect the voltage value of second resistance, and the controller is used
The state of high-pressure-loop is judged according to the voltage value of first resistor and the voltage value of second resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201821134373.8U CN208459521U (en) | 2018-07-17 | 2018-07-17 | A kind of electric vehicle and its high-pressure-loop detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821134373.8U CN208459521U (en) | 2018-07-17 | 2018-07-17 | A kind of electric vehicle and its high-pressure-loop detection circuit |
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| CN208459521U true CN208459521U (en) | 2019-02-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112882456A (en) * | 2021-01-13 | 2021-06-01 | 深圳市道通科技股份有限公司 | OBD equipment |
-
2018
- 2018-07-17 CN CN201821134373.8U patent/CN208459521U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112882456A (en) * | 2021-01-13 | 2021-06-01 | 深圳市道通科技股份有限公司 | OBD equipment |
| CN112882456B (en) * | 2021-01-13 | 2022-04-12 | 深圳市道通科技股份有限公司 | OBD equipment |
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