CN113189958A - Detection circuit and detection method for motor control unit of automobile engine - Google Patents
Detection circuit and detection method for motor control unit of automobile engine Download PDFInfo
- Publication number
- CN113189958A CN113189958A CN202110403111.7A CN202110403111A CN113189958A CN 113189958 A CN113189958 A CN 113189958A CN 202110403111 A CN202110403111 A CN 202110403111A CN 113189958 A CN113189958 A CN 113189958A
- Authority
- CN
- China
- Prior art keywords
- sampling
- sampling resistor
- circuit
- gain
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 33
- 238000005070 sampling Methods 0.000 claims abstract description 75
- 230000003068 static effect Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 11
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0221—Preprocessing measurements, e.g. data collection rate adjustment; Standardization of measurements; Time series or signal analysis, e.g. frequency analysis or wavelets; Trustworthiness of measurements; Indexes therefor; Measurements using easily measured parameters to estimate parameters difficult to measure; Virtual sensor creation; De-noising; Sensor fusion; Unconventional preprocessing inherently present in specific fault detection methods like PCA-based methods
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention provides an offline detection circuit and a detection method for the production of an electric control unit of an automobile engine; belongs to the technical field of control and detection of automobile engine motors; in the prior art, the test efficiency is low, and the test cannot adapt to the measuring range; the invention provides a detection circuit of a motor control unit of an automobile engine, which comprises a singlechip, a sampling resistor selection circuit and a voltage sampling circuit, wherein the sampling resistor selection circuit comprises a sampling resistor selection circuit and a sampling resistor selection circuit; automatic measurement and self-adaption of measurement range are realized.
Description
Technical Field
The invention relates to the technical field of automobile engine motor control detection, in particular to a production offline detection circuit and a detection method for an automobile engine motor control unit.
Background
The quiescent current of the automobile engine electric control unit in a non-operating state determines the quiescent power consumption of the automobile engine electric control unit, and each whole automobile factory has strict requirements on the quiescent current of the controller, which is different from uA to mA, so that the quiescent current detection of a product is required when the controller is off-line in production.
At present, most manufacturers collect the mA grade or uA grade of a universal meter; however, the mA grade or uA grade of the universal meter is collected for manual measurement, the test efficiency is low, and the test cannot adapt to the measuring range.
There is a need for a detection apparatus and a detection method that overcome the above-mentioned problems.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a detection circuit of a motor control unit of an automobile engine, which is characterized in that: the detection circuit comprises a single chip microcomputer, a sampling resistor selection circuit and a voltage sampling circuit;
the sampling resistor selection circuit selects sampling resistors with different resistance values;
the external power supply unit supplies power to the detected engine motor control unit ECU at the port of the detection circuit through the selected sampling resistor;
the voltage sampling circuit collects sampling voltage signals and feeds the sampling voltage signals back to the single chip microcomputer.
Preferably, the sampling resistor selection circuit comprises a plurality of sampling resistors with different resistance values and a relay set, each resistance value is different, the sampling resistors have independent switches in the relay set, the single chip microcomputer controls the relay set to select the sampling resistors with different resistance values.
Preferably, the voltage sampling circuit comprises a gain operational amplifier circuit and a voltage dividing resistor; the gain operational amplifier circuit collects the sampling voltage signal at the port; the output end of the divider resistor is grounded through a capacitor.
The invention also provides a detection method based on the detection circuit, which is characterized in that: the method comprises the following steps:
step (1): firstly, the detection circuit selects one sampling resistor through a singlechip control relay group, and simultaneously the singlechip controls the gain operational amplifier circuit to select a gain multiple;
step (2): the single chip microcomputer collects voltages at two ends of the selected sampling resistor;
and (3): the single chip microcomputer judges the voltages at two ends of the selected sampling resistor, if the voltages at two ends of the selected sampling resistor are close to zero or exceed the measuring range, the step (1) is returned, and another group of resistors and gain multiples are selected again;
and (4): and if the voltage values at the two ends of the selected sampling resistor are within a reasonable range, calculating the quiescent current according to the resistance value and the gain multiple of the sampling resistor.
Preferably, in step (4), the calculation formula adopted for the estimation is as follows: V/(Gain Rs); wherein I is static current, V is voltage at two ends of the sampling resistor, Gain is Gain coefficient, and Rs is resistance value of the sampling resistor.
Preferably, in step (1), when the sampling resistor is selected at the beginning of detection every time, a larger resistor should be selected first to prevent the electric current from being too large and damaging the electric control equipment of the automobile engine.
Compared with the prior art, the invention at least has the following beneficial effects:
1) the invention realizes software automatic measurement and self-adapting measuring range by adopting the sampling resistance selection circuit and the voltage sampling circuit.
Drawings
FIG. 1 is a static current circuit test block diagram of an electric control device of an automobile engine according to the present invention;
FIG. 2 is a flow chart of the test of the electric control equipment of the automobile engine.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
FIG. 1 is a block diagram of a static current circuit test according to the present invention; the right side of the dotted line is a power supply network of the measured controller; the left side of the dotted line is a hardware testing circuit which consists of a sampling resistor selection circuit and a voltage sampling circuit. The sampling resistor selection circuit consists of a plurality of sampling resistors with different resistance values and a relay group, each different sampling resistor is provided with a switch corresponding to the relay group, and the single chip microcomputer controller controls the electric appliance group to select the sampling resistors with different resistance values;
the power supply unit supplies power to an engine motor control unit ECU at a port of the test circuit through a sampling resistor selected by the relay group;
the voltage sampling circuit collects sampling voltage signals at a port of the test circuit by the gain operational amplifier circuit, and outputs the sampling voltage signals to a sampling port of the single chip microcomputer through gain processing; the gain operational amplifier circuit takes a sampling voltage signal selected and collected by a switch of the relay group as an input, and the gain operational amplifier circuit outputs the sampling voltage signal to a sampling port of the single chip microcomputer through a voltage dividing resistor; the output end of the divider resistor is also grounded through a capacitor C.
FIG. 2 is a flow chart of the test of the electric control device of the automobile engine according to the present invention;
measuring circuit at first selects 1 fender sampling resistor through single chip microcomputer control relay group, and gain 1 fender is selected in gain operational amplifier of simultaneous control, then the voltage at sampling resistor both ends is gathered to the single chip microcomputer, and judge the voltage value through software, when voltage value is super little and is close zero volt or overrange, switch relay group and gain operational amplifier by the single chip microcomputer and select other sampling resistors, until sampling voltage value is in the reasonable range of range, then according to sampling resistor, gain calculation quiescent current is put to fortune, the computational formula is: V/(Gain Rs); wherein I is static current, V is voltage at two ends of the sampling resistor, Gain is Gain coefficient, and Rs is resistance value of the sampling resistor.
When the sampling resistor is selected at the beginning of detection every time, a larger resistor is selected to prevent the electric current from being too large and damaging the electric control equipment of the automobile engine.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (6)
1. A detection circuit of a motor control unit of an automobile engine is characterized in that: the detection circuit comprises a single chip microcomputer, a sampling resistor selection circuit and a voltage sampling circuit;
the sampling resistor selection circuit selects sampling resistors with different resistance values;
the external power supply unit supplies power to the detected engine motor control unit ECU at the port of the detection circuit through the selected sampling resistor;
the voltage sampling circuit collects sampling voltage signals and feeds the sampling voltage signals back to the single chip microcomputer.
2. The detection circuit of claim 1, wherein: sampling resistor selection circuit includes the sampling resistor and the relay group of a plurality of different resistances, and every resistance is different sampling resistor has solitary switch corresponds with it in the relay group, single chip microcomputer control the sampling resistor of different resistances is selected to the relay group.
3. The detection circuit of claim 1, wherein: the voltage sampling circuit comprises a gain operational amplifier circuit and a divider resistor; the gain operational amplifier circuit collects the sampling voltage signal at the port; the output end of the divider resistor is grounded through a capacitor.
4. A detection method using the detection circuit of any one of claims 1 to 5, characterized by: the method comprises the following steps:
step (1): firstly, the detection circuit selects one sampling resistor through a singlechip control relay group, and simultaneously the singlechip controls the gain operational amplifier circuit to select a gain multiple;
step (2): the single chip microcomputer collects voltages at two ends of the selected sampling resistor;
and (3): the single chip microcomputer judges the voltages at two ends of the selected sampling resistor, if the voltages at two ends of the selected sampling resistor are close to zero or exceed the measuring range, the step (1) is returned, and another group of resistors and gain multiples are selected again;
and (4): and if the voltage values at the two ends of the selected sampling resistor are within a reasonable range, calculating the quiescent current according to the resistance value and the gain multiple of the sampling resistor.
5. The detection method according to claim 4, characterized in that: in step (4), the calculation formula adopted for the estimation is as follows: V/(Gain Rs); wherein I is static current, V is voltage at two ends of the sampling resistor, Gain is Gain coefficient, and Rs is resistance value of the sampling resistor.
6. The detection method according to claim 4, characterized in that: in the step (1), when the sampling resistor is selected at the beginning of detection every time, a larger resistor is selected to prevent the electric current from being too large and damaging the electric control equipment of the automobile engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110403111.7A CN113189958A (en) | 2021-04-15 | 2021-04-15 | Detection circuit and detection method for motor control unit of automobile engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110403111.7A CN113189958A (en) | 2021-04-15 | 2021-04-15 | Detection circuit and detection method for motor control unit of automobile engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113189958A true CN113189958A (en) | 2021-07-30 |
Family
ID=76975782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110403111.7A Pending CN113189958A (en) | 2021-04-15 | 2021-04-15 | Detection circuit and detection method for motor control unit of automobile engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113189958A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769957A (en) * | 2010-02-02 | 2010-07-07 | 株洲南车时代电气股份有限公司 | Automatic switching circuit for voltage and current measurement and method thereof |
| CN211123025U (en) * | 2019-09-30 | 2020-07-28 | 惠州市德赛西威汽车电子股份有限公司 | High-precision current acquisition circuit |
| CN212872607U (en) * | 2020-06-30 | 2021-04-02 | 深圳市瑞能实业股份有限公司 | Multi-range test circuit and multi-range test device |
-
2021
- 2021-04-15 CN CN202110403111.7A patent/CN113189958A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769957A (en) * | 2010-02-02 | 2010-07-07 | 株洲南车时代电气股份有限公司 | Automatic switching circuit for voltage and current measurement and method thereof |
| CN211123025U (en) * | 2019-09-30 | 2020-07-28 | 惠州市德赛西威汽车电子股份有限公司 | High-precision current acquisition circuit |
| CN212872607U (en) * | 2020-06-30 | 2021-04-02 | 深圳市瑞能实业股份有限公司 | Multi-range test circuit and multi-range test device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1586910B1 (en) | Method of and device for insulation monitoring | |
| US9250294B2 (en) | Method for detecting a switching position of a switching device | |
| US5418453A (en) | Method of measuring wheel speed sensor impedance | |
| AU2006200289A1 (en) | System and method for determining a compensation factor suitable for correcting an attenuated signal in a conductor | |
| CN107407699B (en) | Battery management device, battery monitoring circuit, and control system | |
| CN104579816A (en) | Vehicle network health assessment | |
| EP2527854B1 (en) | Systems and methods for determining electrical faults | |
| CN102393484A (en) | Device for detecting stability of current | |
| WO2018172216A1 (en) | Battery energy store | |
| CN111551865A (en) | Apparatus and method for monitoring reliability of cell impedance measurements of battery cells | |
| SE459946B (en) | RELAY PROTECTION WITH SELECTIVE PHASE SELECTION FOR DOUBLE CABLES | |
| CN113189958A (en) | Detection circuit and detection method for motor control unit of automobile engine | |
| CN112083299A (en) | Direct current system insulation fault prediction method based on Kalman filtering | |
| CN107291069B (en) | Vacuum pump controller testing device | |
| CN114295242A (en) | Motor controller and motor temperature sampling circuit thereof | |
| CN111123106B (en) | Sensor and method for checking a sensor | |
| CN210571092U (en) | High-efficient multichannel vehicle air conditioner sensor detector | |
| CN105203146A (en) | Sensor interconnection device and sensor detection system and method | |
| CN104834300A (en) | Vehicle window clamping stagnation fault monitoring method and system | |
| JP3577638B2 (en) | Resistance measuring device | |
| KR20220066978A (en) | How to estimate the insulation resistance of a high voltage circuit in an electric or hybrid vehicle | |
| CN113189959B (en) | Test circuit and test method of drive circuit | |
| CN109031058B (en) | Insulation detection device and insulation detection circuit | |
| US10948547B2 (en) | Battery monitoring system | |
| JP3962991B2 (en) | Insulation detector for ungrounded power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210730 |