CN205592025U - Engine control unit - Google Patents
Engine control unit Download PDFInfo
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- CN205592025U CN205592025U CN201620446785.XU CN201620446785U CN205592025U CN 205592025 U CN205592025 U CN 205592025U CN 201620446785 U CN201620446785 U CN 201620446785U CN 205592025 U CN205592025 U CN 205592025U
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- microprocessor
- control unit
- engine
- pull
- signal
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Abstract
The utility model relates to an engine control unit, include: including microprocessor's signal processing module, inputing the signal input module for microprocessor with the incoming signal of difference, signal after handling microprocessor carries out the signal output module exported, power supply module, and the communication bus interface that is connected with microprocessor, include the AD converter among the microprocessor, be connected with pull down resistor and pull -up resistance on the analog signal input of this AD converter. According to the utility model discloses an engine control unit has a more optimal online diagnosis function, the extra measurement analytical work of in need of repair personnel not, and differentiation sensor circuit's that just can be accurate error condition is opened a way or short ground.
Description
Technical field
This utility model relates to auto parts and components field, and specifically, relating to one can be to micro-process
The analogue signal incoming line fault of device carries out the control unit of engine of inline diagnosis.
Background technology
The control unit of engine (ECU, Engine Control Unit) of automobile is the heaviest on automobile
One of kernel component wanted, is the control centre of engine control system, and it is by monitoring from respectively
The information of individual sensor and other input signals, it is achieved to fuel injection system, ignition system, discharge
The control of control system, onboard diagnostic system, air-conditioning and fan system etc..As it is shown in figure 1, start
Machine control unit includes that several main modular forms: signal input module, signal processing module, signal
Output module.Signal input module is by the analogue signal received, switch input quantity and frequency input quantity
The microprocessor inputed in signal processing module Deng signal processes, and microprocessor will receive letter
Exported by signal output module after processing number by analysis that (the dynamic and low limit of such as output point fireflood drives
Signal).Power supply module is for powering to above-mentioned modules, and microprocessor is also associated with bus
Interface, it is achieved and the communication between other auto parts and components.
For connected sensor, control unit of engine except can normal acquisition process from
Outside the signal of sensor, for the demand of inline diagnosis (OBD, On Board Diagnost ic),
Also need to the abnormal condition to sensor circuit (, opening a way) etc. detect the shortlyest, if
Abnormal condition occur, relevant information can be stored, facilitate maintainer by control unit of engine
It is accurately judged to what mistake sensor circuit there occurs.
Existing control unit of engine, is open circuit or short for connected sensor circuit
Time, the voltage that microprocessor detects is all 0V, cannot be distinguished by for above two fault, dimension
The personnel of repairing need extra measurement to carry out judging to distinguish, and waste time and energy.
Summary of the invention
This utility model purpose is to provide a kind of control unit of engine with switchable pull-up resistor,
Solve control unit of engine during the inline diagnosis to connected sensor circuit, nothing
Method difference open circuit and the problem on short ground.
This utility model provides a kind of control unit of engine, including:
Include the signal processing module of microprocessor, different input signals is inputed to microprocessor
Signal input module, the signal output module that the signal after microprocessor processes is exported, electricity
Source supply module, the communication bus interface being connected with microprocessor, described microprocessor includes
A/d converter, the input end of analog signal of this a/d converter connects and has pull down resistor and pull-up electricity
Resistance.
Further, described pull-up resistor is switchable pull-up resistor.
Further, the other end of described switchable pull-up resistor is connected to control unit of engine
Power supply module.
Further, described switchable pull-up resistor is positioned at the inside of described microprocessor.
Further, described switchable pull-up resistor is positioned on the circuit board outside described microprocessor.
Further, the signal output part phase of the input end of analog signal of described a/d converter and sensor
Connect.
Further, described pull down resistor is unswitched pull down resistor.
Further, described pull down resistor one end ground connection.
Further, described pull down resistor is positioned on the circuit board outside described microprocessor.
Compared with prior art, the control unit of engine that this utility model provides has more optimal
Inline diagnosis function, it is not necessary to the measurement analysis work that maintainer is extra, it is possible to distinguish accurately
The error condition of sensor circuit is open circuit or short, is very easy to real in semiconductor fabrication process
Existing and cost free increases.
Accompanying drawing explanation
The accompanying drawing of the part constituting the application is used for providing being further appreciated by of the present utility model, this
The schematic description and description of utility model is used for explaining this utility model, is not intended that this reality
With novel improper restriction.
Fig. 1 is the system block diagram of traditional control unit of engine；
Fig. 2 is the structural representation of an embodiment of the present utility model；
Fig. 3 is the structural representation of another embodiment of the present utility model；
Fig. 4 is the structural representation that sensor circuit is open-circuit condition combining Fig. 2；
Fig. 5 is the structural representation that sensor circuit is short ground state combining Fig. 2.
Detailed description of the invention
Below with reference to accompanying drawings and by embodiment the electromotor control according to this utility model realization is described
Unit processed.
As it is shown in figure 1, automobile ECU comprises following main modular: include at the signal of microprocessor
Reason module, inputs to the signal input module of microprocessor, to microprocessor by different input signals
Signal after process carries out the signal output module exported, power supply module, and and microprocessor
The communication bus interface being connected.Its main operation modes is: in the signal processing module in ECU
Microprocessor receive/gather from the various input quantities in signal input module, such as switch input quantity,
Frequency input quantity and the analogue signal input etc. from sensor, microprocessor is by after above-mentioned signal processing
(such as: calculate distributive value and the control of associated actuator of each circulation of doing manual work), then passes through
Corresponding H bridge submodule, igniting in signal output module drive the module such as submodule and the driving of low limit
Driving signal is exported to performing device, thus complete the control of ECU control system corresponding to automobile.
For being connected to the sensor of ECU, ECU processes self-sensing except being required to normal acquisition
Outside the signal of device, for the demand of OBD, in addition it is also necessary to (the shortest to sensor circuit abnormal condition
Ground and open circuit) carry out on-line checking, detection information stores the most at last, facilitates maintainer accurate
Judge what mistake sensor circuit occurs.In order to can accurately distinguish during OBD short and
The abnormal condition of open circuit, the utility model proposes two kinds and comprises switchable pull-up resistor circuit
ECU scheme, the most as shown in Figures 2 and 3, on the basis of ECU basic structure shown in Fig. 1,
Connect on the input end of analog signal of a/d converter (being positioned at described microprocessor internal) further
There is pull down resistor R1 and pull-up resistor R3.
It is preferred that this pull-up resistor circuit R3 is specially switchable pull-up resistor, its other end is even
It is connected to the power supply module Vdd of ECU, and this pull-up resistor circuit R3 may be located at described micro-process
The inside (shown in Fig. 2) of device or be positioned on the circuit board outside described microprocessor (shown in Fig. 3).
It is preferred that described pull down resistor R1 is unswitched pull down resistor, one end ground connection and being positioned at
On circuit board outside described microprocessor.
Fig. 4 and Fig. 5 on the basis of ECU described in Fig. 2 is schematic diagram, respectively illustrates the AD of ECU
The input end of analog signal of transducer occurs in that open fault after being connected with the signal output part of sensor
Situation with short earth fault.Former to open circuit and the short ground of sensor circuit below in conjunction with Fig. 4 and Fig. 5
Barrier diagnosis process is described in detail: in ECU course of normal operation, its microprocessor can be at interval of one section
The voltage (a/d converter input terminal voltage) of sensor circuit is read by the time (such as 10ms)
Take, if when microcomputer reads to voltage be 0V time, then imply that sensor circuit have open circuit or
The short earth fault of person occurs, and the switchable pull-up resistor R3 of now microprocessor triggering is linked in circuit
And again read off a/d converter input terminal voltage, and the magnitude of voltage again read off, then a/d converter
This numerical value again read off can be converted into digital quantity, then through microprocessor internal software with a certain at the beginning of
Beginning setting value compares judgement.Illustrate: if again reading off after accessing pull-up switch resistance R3
Voltage value when being 3.75V (the normal working voltage scope of sensor is 2V to 5V), then sentence
Being set to circuit is open fault, the most as shown in Figure 4 embodiment；If the magnitude of voltage again read off is less than
During 3.3V, then decision circuit is short earth fault, the most as shown in Figure 5 embodiment.Thus pass through OBD
Mode be achieved that sensor circuit open fault and the differentiation of short earth fault.
Although this utility model discloses as above with preferred embodiment, but this utility model is not limited to
This.Any those skilled in the art, that is made in without departing from spirit and scope of the present utility model is each
Plant and change and amendment, all should include in protection domain of the present utility model, guarantor the most of the present utility model
The scope of protecting should be as the criterion with claim limited range.
Claims (9)
1. a control unit of engine, including:
Include the signal processing module of microprocessor,
Different input signals is inputed to the signal input module of microprocessor,
The signal output module that signal after microprocessor processes is exported,
Power supply module,
The communication bus interface being connected with microprocessor,
It is characterized in that,
Described microprocessor includes a/d converter, the input end of analog signal of this a/d converter
Upper connection has pull down resistor and pull-up resistor.
Control unit of engine the most according to claim 1, it is characterised in that described pull-up electricity
Resistance is switchable pull-up resistor.
Control unit of engine the most according to claim 2, it is characterised in that described switchable
The other end of pull-up resistor be connected to the power supply module of control unit of engine.
Control unit of engine the most according to claim 2, it is characterised in that described switchable
Pull-up resistor be positioned at the inside of described microprocessor.
Control unit of engine the most according to claim 2, it is characterised in that described switchable
Pull-up resistor be positioned on the circuit board outside described microprocessor.
Control unit of engine the most according to claim 1, it is characterised in that described AD turns
The input end of analog signal of parallel operation is connected with the signal output part of sensor.
Control unit of engine the most according to claim 1, it is characterised in that described drop-down electricity
Resistance is unswitched pull down resistor.
Control unit of engine the most according to claim 1, it is characterised in that described drop-down electricity
Resistance one end ground connection.
Control unit of engine the most according to claim 1, it is characterised in that described drop-down electricity
Resistance is positioned on the circuit board outside described microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620446785.XU CN205592025U (en) | 2016-05-17 | 2016-05-17 | Engine control unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620446785.XU CN205592025U (en) | 2016-05-17 | 2016-05-17 | Engine control unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205592025U true CN205592025U (en) | 2016-09-21 |
Family
ID=56931495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620446785.XU Active CN205592025U (en) | 2016-05-17 | 2016-05-17 | Engine control unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205592025U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111366260A (en) * | 2020-04-26 | 2020-07-03 | 广东虹勤通讯技术有限公司 | Temperature monitoring circuit, system and method |
-
2016
- 2016-05-17 CN CN201620446785.XU patent/CN205592025U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111366260A (en) * | 2020-04-26 | 2020-07-03 | 广东虹勤通讯技术有限公司 | Temperature monitoring circuit, system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191231 Address after: 130033 No. 1981, Wuhan Road, Changchun economic and Technological Development Zone, Changchun, Jilin Patentee after: Shibeite automotive electronics (Changchun) Co., Ltd. Address before: 130033 No. 1981, Wuhan Road, Changchun economic and Technological Development Zone, Changchun, Jilin Patentee before: Continental Automotive Electronics (Changchun) Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 130033 No. 1981, Wuhan Road, Changchun economic and Technological Development Zone, Changchun, Jilin Patentee after: WeiPai automotive electronics (Changchun) Co., Ltd Address before: 130033 No. 1981, Wuhan Road, Changchun economic and Technological Development Zone, Changchun, Jilin Patentee before: Shibeite automotive electronics (Changchun) Co., Ltd. |
|
| CP01 | Change in the name or title of a patent holder |