CN104111399A - Vehicle electronic control unit ground connection and ground pressure difference detection circuit - Google Patents
Vehicle electronic control unit ground connection and ground pressure difference detection circuit Download PDFInfo
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- CN104111399A CN104111399A CN201310141316.8A CN201310141316A CN104111399A CN 104111399 A CN104111399 A CN 104111399A CN 201310141316 A CN201310141316 A CN 201310141316A CN 104111399 A CN104111399 A CN 104111399A
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Abstract
The invention relates to a vehicle electronic control unit (ECU) ground connection and ground pressure difference detection circuit. The detection circuit is connected to a system control part, a system control power ground GND1 and a high-power power ground GND2. The detection circuit comprises a diode group D, a resistive voltage division network, a reference voltage Vref, a capacitor C1, and an AD conversion module. The anode of the diode group D is connected between the system control part and the system control power ground GND1, and the cathode of the diode group D is connected with the high-power power ground GND2. The resistive voltage division network is composed of a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected with the reference voltage Vref, and the other end of the first resistor is connected with the high-power power ground GND2 through the resistor R2. One end of the capacitor C1 and the input end of the AD conversion module are connected between the first resistor R1 and the second resistor R2. Compared with the prior art, the vehicle electronic control unit ground connection and ground pressure difference detection circuit has the following advantages: the fault diagnosis capability of finished vehicles is improved, the cost is low, detection is accurate, and the like.
Description
Technical field
The present invention relates to auto electronic control technology field, especially relate to a kind of vehicle electronic control unit and connect and ground pressure differential detection circuit.
Background technology
Vehicle electronic control unit (ECU) is widely applied in automotive control system, automobile is ECU power supply by Vehicular accumulator cell and generator, contain the high-power driving electronic control unit of (as motor drives) for some, two-way independent current source is often provided, one tunnel system control power supply, a road large power supply.
For the vehicle electronic control unit that contains two-way power supply, control system need to detect the voltage difference between two-way ground, and the fault of certain ground open circuit is surveyed.In prior art, the normal method adopting is in system, control circuit, to place a discharge circuit, and high-power ground voltage is carried out to sampling processing, and processings output is sent into processor and simulate digital conversion (ADC) module and gather.Which need to be used special automotive grade amplifier chip; and need to carry out certain anti-high voltage transient protection to amplifier chip power input end; circuit is more complicated; cost is high; and the precondition of this testing circuit work be system control power supply connect good; when system control power supply occur open circuit; large power, electrically seedbed connects in good situation; because now systems control division divides and cannot power on; testing circuit is not worked; vehicle electronic control unit cannot send dependent failure information, and therefore prior art failure rate is high, and practicality is not strong.
Therefore, for the vehicle electronic control unit of two-way independent current source, need a kind of ground connected mode, make its any road open a way in the situation that, systems control division divides and can normally work, testing circuit does not use amplifier chip, only needs little components and parts, can detect the pressure reduction between two-way ground and the fault of certain ground open circuit is surveyed.
Summary of the invention
Object of the present invention is exactly to provide a kind of vehicle electronic control unit in order to overcome the defect that above-mentioned prior art exists to connect and ground pressure differential detection circuit, by this circuit ECU system control power supply still failure message can be sent to other vehicle electronic control unit open a way in the situation that, thereby improved the trouble diagnosibility of car load.
Object of the present invention can be achieved through the following technical solutions:
A kind of vehicle electronic control unit ground connects and ground pressure differential detection circuit, this testing circuit is connected on that systems control division divides, system control power supply ground GND1 and large power, electrically seedbed GND2, it is characterized in that, described testing circuit comprises diode group D, resistance pressure-dividing network, reference voltage Vref, capacitor C 1 and AD modular converter
Described diode group D anodic bonding divides between system control power supply ground GND1 at systems control division, and negative electrode connects large power, electrically seedbed GND2;
Described resistance pressure-dividing network is made up of the first resistance R 1 and the second resistance R 2, and first resistance R 1 one end connects reference voltage Vref, and the other end is connected with large power, electrically seedbed GND2 by the second resistance R 2;
Described capacitor C 1 one end, AD modular converter input end are connected on respectively between the first resistance R 1 and the second resistance R 2, and described capacitor C 1 other end is connected with system control power supply ground GND1, and described AD modular converter is taking GND1 as reference ground.
Described diode group D is made up of one or more diodes.
Described multiple diodes are connected in series successively.
Described reference voltage Vref is taking system control power supply ground GND1 as reference ground.
Principle of work of the present invention is:
1, in the time of system control power supply ground GND1 open circuit, GND1 voltage ratio large power, electrically seedbed, system control power supply ground GND2 voltage exceeds the forward conduction voltage of diode group D, and the existence of diode group D divides still systems control division can to power on; When system control power supply ground GND1 connects and when large power, electrically seedbed GND2 open circuit, systems control division divides and still can normally work on power, and as can be seen here, any power supply ground, road open circuit does not all affect the normal work of systems control division parallel circuit.
2, described reference voltage Vref is taking system control power supply ground GND1 as reference, by resistance pressure-dividing network, large power, electrically seedbed GND2 is carried out to dividing potential drop, signal after dividing potential drop is connected to processor A DC module, by reading the reading of this ADC, can calculate two pressure reduction between ground.If the ground pressure reduction overrun detecting, and reach the possible range of the forward voltage drop of diode group D, can judge system control power supply ground GND1 open circuit; In the time that large power, electrically seedbed GND2 opens a way, the voltage of sending into processor A DC module is exactly reference voltage Vref, only needs by the resistance of reasonable disposition divider resistance R1, R2, and system just can be told the situation of large power, electrically seedbed GND2 open circuit.
It should be noted that: whether obscure for fear of pressure difference and diode group D forward voltage drop normally, open a way thereby judge smoothly system control power supply ground GND1, the minimum forward voltage drop value of diode group D must be greater than the possible maximal value of ground pressure reduction.Can increase the minimum forward voltage drop value of the logical group of diode D by increasing series diode number.
Compared with prior art, the invention enables ECU system control power supply still failure message can be sent to other ECU open a way in the situation that, thereby improved the trouble diagnosibility of car load, and in the time detecting ground pressure reduction, do not need to use compared with multicomponent device, cost is low.
Brief description of the drawings
Fig. 1 is the schematic diagram of the embodiment of the present invention 1;
Fig. 2 is the schematic diagram of the embodiment of the present invention 2.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
As shown in Figure 1, a kind of vehicle electronic control unit ground connects and ground pressure differential detection circuit, comprise diode group D, resistance pressure-dividing network 2, reference voltage Vref and capacitor C 1, described diode group D anode respectively connected system control power supply ground GND1 and systems control division divides 1, and negative electrode connects large power, electrically seedbed GND2; Described resistance pressure-dividing network 2 is composed in series by the first resistance R 1 and the second resistance R 2, and first resistance R 1 other end connects reference voltage Vref, and second resistance R 2 other ends connect large power, electrically seedbed GND2; Described capacitor C 1 is connected in parallel with processor simulation digital conversion (ADC) module, and one end is connected with the public connecting end of R1, R2, and the other end is connected with system control power supply ground GND1.Described capacitor C 1 plays sampling maintenance effect.
Described diode group D is made up of one or more diodes, if formed by multiple diodes, and all diode arranged in series.Described reference voltage is taking system control power supply ground GND1 as reference ground.
Embodiment 2
As shown in Figure 2, in the present embodiment, diode group D has two diode D1, D2 to be composed in series.In the time of system control power supply ground GND1 open circuit, diode D1, D2 and large power, electrically seedbed GND2 provide Liao Yi road ground circuit, make systems control division divide 1 circuit to work on power, the R1 of resistance pressure-dividing network 2, the ground pressure reduction Acquisition Circuit that R2 forms is able to normal work, the sampled voltage that is now connected to processor A DC port is: V=[R2*Vref-R1* (GND1-GND2)]/(R1+R2), this magnitude of voltage be taking system control power supply as with reference to ground magnitude of voltage, by reading ADC reading, can converse the magnitude of voltage of ADC port, and then obtain the magnitude of voltage of GND1-GND2 by above-mentioned formula, it is the voltage difference between system control power supply ground GND1 and large power, electrically seedbed GND2.If this difference is greater than normal possible ground pressure difference, reach the forward voltage drop value of diode group D, can judge system control power supply ground GND1 open circuit.
In the time that large power, electrically seedbed GND2 opens a way, the sample voltage value of processor A DC port is exactly reference voltage Vref, and the voltage during from pressure difference normally and system control power supply ground GND1 open circuit is obviously different, and system can be judged large power, electrically seedbed GND2 open circuit.
Design example is above only a preferred embodiment in the present invention, and other,, according to design circuit of the present invention or the design that derives, should be contained in protection scope of the present invention.
Claims (4)
1. a vehicle electronic control unit ground connects and ground pressure differential detection circuit, this testing circuit is connected on that systems control division divides, system control power supply ground GND1 and large power, electrically seedbed GND2, it is characterized in that, described testing circuit comprises diode group D, resistance pressure-dividing network, reference voltage Vref, capacitor C 1 and AD modular converter
Described diode group D anodic bonding divides between system control power supply ground GND1 at systems control division, and negative electrode connects large power, electrically seedbed GND2;
Described resistance pressure-dividing network is made up of the first resistance R 1 and the second resistance R 2, and first resistance R 1 one end connects reference voltage Vref, and the other end is connected with large power, electrically seedbed GND2 by the second resistance R 2;
Described capacitor C 1 one end, AD modular converter input end are connected on respectively between the first resistance R 1 and the second resistance R 2, and described capacitor C 1 other end is connected with system control power supply ground GND1, and described AD modular converter is taking GND1 as reference ground.
2. a kind of vehicle electronic control unit according to claim 1 ground connects and ground pressure differential detection circuit, it is characterized in that, described diode group D is made up of one or more diodes.
3. a kind of vehicle electronic control unit according to claim 2 ground connects and ground pressure differential detection circuit, it is characterized in that, described multiple diodes are connected in series successively.
4. a kind of vehicle electronic control unit according to claim 1 ground connects and ground pressure differential detection circuit, it is characterized in that, described reference voltage Vref is taking system control power supply ground GND1 as reference ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310141316.8A CN104111399A (en) | 2013-04-22 | 2013-04-22 | Vehicle electronic control unit ground connection and ground pressure difference detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310141316.8A CN104111399A (en) | 2013-04-22 | 2013-04-22 | Vehicle electronic control unit ground connection and ground pressure difference detection circuit |
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| CN104111399A true CN104111399A (en) | 2014-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310141316.8A Pending CN104111399A (en) | 2013-04-22 | 2013-04-22 | Vehicle electronic control unit ground connection and ground pressure difference detection circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105977924A (en) * | 2016-05-12 | 2016-09-28 | 山东天海科技股份有限公司 | EPS controller bus circuit |
| CN108287289A (en) * | 2017-01-10 | 2018-07-17 | 华为技术有限公司 | Detection circuit and its detection method altogether |
| CN109416382A (en) * | 2015-07-08 | 2019-03-01 | 凯尔西-海耶斯公司 | Ground connection loss detection circuit |
| US10787079B2 (en) | 2018-09-27 | 2020-09-29 | Ford Global Technologies, Llc | Vehicle ground path impedance difference detection |
-
2013
- 2013-04-22 CN CN201310141316.8A patent/CN104111399A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109416382A (en) * | 2015-07-08 | 2019-03-01 | 凯尔西-海耶斯公司 | Ground connection loss detection circuit |
| CN105977924A (en) * | 2016-05-12 | 2016-09-28 | 山东天海科技股份有限公司 | EPS controller bus circuit |
| CN105977924B (en) * | 2016-05-12 | 2018-08-24 | 山东天海科技股份有限公司 | A kind of EPS controllers bus circuit |
| CN108287289A (en) * | 2017-01-10 | 2018-07-17 | 华为技术有限公司 | Detection circuit and its detection method altogether |
| WO2018130129A1 (en) * | 2017-01-10 | 2018-07-19 | 华为技术有限公司 | Common ground detection circuit and detection method thereof |
| CN108287289B (en) * | 2017-01-10 | 2020-04-21 | 华为技术有限公司 | Common ground detection circuit and detection method thereof |
| US10787079B2 (en) | 2018-09-27 | 2020-09-29 | Ford Global Technologies, Llc | Vehicle ground path impedance difference detection |
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Application publication date: 20141022 |