CN207114156U - EGR valve detector - Google Patents
EGR valve detector Download PDFInfo
- Publication number
- CN207114156U CN207114156U CN201720964135.9U CN201720964135U CN207114156U CN 207114156 U CN207114156 U CN 207114156U CN 201720964135 U CN201720964135 U CN 201720964135U CN 207114156 U CN207114156 U CN 207114156U
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- egr valve
- circuit
- cpu
- detector according
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Abstract
The utility model discloses a kind of EGR valve detector.Including CPU, the signal processing circuit being connected respectively with CPU and EGR valve drive circuit, the pin handover module being connected with signal processing circuit, and the DB15 interfaces being connected with pin handover module；The EGR valve drive circuit is also connected with DB15 interfaces.The utility model is simple in construction, easy to operate, the quality for detecting EGR valve that can be light, independent.
Description
Technical field
It the utility model is related to a kind of EGR valve detector.
Background technology
The instrument not detected on the market to EGR valve also at present.The maintenance of existing EGR valve relies primarily on maintenance personal
Manually open and inspect.It is artificial to open and inspect that operating efficiency is low, and the decision problem degree of accuracy is not high, while to the position sensor people in EGR valve
Work can not judge.
Utility model content
In order to improve above mentioned problem, the utility model provides a kind of EGR valve detector.
To achieve these goals, the technical solution adopted in the utility model is as follows：
EGR valve detector, including CPU, the signal processing circuit being connected respectively with CPU and EGR valve drive circuit, with signal
The connected pin handover module of process circuit, and the DB15 interfaces being connected with pin handover module；The EGR valve drive circuit
Also it is connected with DB15 interfaces.
Further, the EGR valve drive circuit includes MCU, the MOS drive circuit being connected with MCU, electricity is driven with MOS
The connected active current foldback circuit in road, the passive current foldback circuit being connected with active current foldback circuit；The MCU passes through
EGR position sensor signal acquisition circuit is connected with CPU；The MOS drive circuit is connected by MOS with DB15 interfaces.
Yet further, the utility model also includes the display screen being connected with CPU.
Further, the utility model also includes the SD storage cards being connected with CPU.
Selected as one kind, the CPU selects LPC1788.
As one kind select, the pin handover module by multiple relay groups into.
Further, the utility model also includes being used to accommodate CPU, signal processing circuit, pin handover module, EGR valve
The housing of drive circuit, SD storage cards, the display location are located at housing side in surface of shell, the DB15 interfaces.
Yet further, the utility model also includes being arranged at the key-press module being connected in housing and with CPU；The housing
Surface is provided with the button being connected with key-press module.
Further, the signal processing circuit include be sequentially connected protection circuit, Signal Matching and attenuator circuit,
Signal amplification circuit；The Signal Matching and attenuator circuit are connected with pin handover module, the signal amplification circuit and CPU phases
Even.
The utility model compared with prior art, has advantages below and beneficial effect：
The utility model is simple in construction, easy to operate, the quality for detecting EGR valve that can be light, independent.
Brief description of the drawings
Fig. 1 is system block diagram of the present utility model.
Fig. 2 is structural representation of the present utility model.
Wherein, parts title corresponding to mark is in accompanying drawing：1- housings, 2- display screens, 3- buttons.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples, and embodiment of the present utility model includes
But it is not limited to the following example.
Embodiment
As shown in figure 1, EGR valve detector, including CPU, the signal processing circuit being connected respectively with CPU and EGR valve driving
Circuit, the pin handover module being connected with signal processing circuit, and the DB15 interfaces being connected with pin handover module；It is described
EGR valve drive circuit is also connected with DB15 interfaces.
Detection to EGR valve can easily be realized using said apparatus, judge that EGR valve whether there is problem, without as mesh
It is preceding to be detected by way of manually opening and inspecting, operating efficiency is greatly increased, and accuracy in detection is high.Concrete operations
It is that DB15 interfaces are connected with EGR valve, CPU is entered according to pre-set pwm signal by EGR valve drive circuit to EGR valve
Row driving, EGR valve is set to enter working condition, while CPU can also be carried out by DB15 interfaces to the voltage change of position sensor
Collection, maintenance personal can be found that EGR valve whether clamping stagnation, whether position sensor normal.Specifically criterion is：EGR valve has
Action, and the pressure of position sensor changes, a reference value is more than 1V, you can judges that EGR valve is normal, if asynchronously meeting
The above situation, then illustrate that EGR valve breaks down.
Specifically, the EGR valve drive circuit includes MCU, the MOS drive circuit being connected with MCU, with MOS drive circuit
Connected active current foldback circuit, the passive current foldback circuit being connected with active current foldback circuit；The MCU passes through
EGR position sensor signal acquisition circuit is connected with CPU；The MOS drive circuit is connected by MOS with DB15 interfaces.
It is designed to preferably realize the driving to EGR valve using above-mentioned.Wherein, passive current foldback circuit is by from extensive
Double insurance silk and over-voltage protection element, realize the excessively stream to circuit, overvoltage protection；Active current foldback circuit is by using right
The driving current collection of EGR valve, amplification, and coordinate flip-flop circuit, the real-time monitoring to excessively stream is realized, electric current is excessive when occurring
When, circuit locks automatically, into protection.MCU can get over-current signal, and prompt user, it is desirable to understand excessively stream source.And can
To reset overcurrent protection, the normal correlation function of reflex circuit.EGR position sensor signal acquisition circuit is by MCU to EGR valve
Position sensor voltage carries out implementation monitoring, and dynamic is adjusted in MCU to the pwm control signal of EGR valve, is realized to EGR valve height
Precision controlling.MOS drive circuit realizes the driving to EGR valve high current by MOS.
Specifically, the utility model also includes the display screen being connected with CPU.Using the setting of display screen, will can detect
As a result show, intuitively understand testing result, such as can intuitively see the voltage of position sensor.
Specifically, the utility model also includes the SD storage cards being connected with CPU.A large amount of numbers can be stored using SD storage cards
According to being stored to testing result, the long term state of more intuitive understanding EGR valve.
Selected as one kind, the CPU selects LPC1788.
As one kind select, the pin handover module by multiple relay groups into.Being capable of light root using above-mentioned setting
Factually border test case is by circuit switching to corresponding pin.
As shown in Fig. 2 the utility model also includes being used to accommodate CPU, signal processing circuit, pin handover module, EGR valve
The housing 1 of drive circuit, SD storage cards, the display screen 2 are located at surface of shell, and the DB15 interfaces are located at housing side.Adopt
With above-mentioned setting, each part can be protected, while also allow for carrying out the detection of EGR valve.
Specifically, the utility model also includes being arranged at the key-press module being connected in housing and with CPU；The surface of shell
Provided with the button 3 being connected with key-press module.Using above-mentioned setting, easily the utility model can open/close, with
And other operations.
Selected as one kind, the signal processing circuit includes the protection circuit, Signal Matching and decay electricity being sequentially connected
Road, signal amplification circuit；The Signal Matching and attenuator circuit are connected with pin handover module, the signal amplification circuit with
CPU is connected.Wherein, protection circuit can protect the circuit from high-pressure electrostatic, when input voltage is more than 40V, cause circuit to damage.
High-voltage signal is decayed into 3.3V circuits below, facilitates late-class circuit to handle by Signal Matching and attenuator circuit；Match circuit simultaneously
It ensure that circuit signal integrality.Signal is amplified migration processing by signal amplification circuit, ensures that signal can be adopted for CPU
Collection；Using LM358 by emitter follower circuit, addition amplifying circuit, realize and signal is followed into amplification, ensure that to small-signal
Processing meets the requirements.
What deserves to be explained is each component of the present utility model is existing product, directly can buy on the market, so
Do not repeated in this application.
According to above-described embodiment, the utility model can be realized well.What deserves to be explained is based on said structure design
On the premise of, to solve same technical problem, some made on the utility model are without substantial change or profit
Color, the essence of used technical scheme is still as the utility model, therefore it should also be as in protection model of the present utility model
In enclosing.
Claims (9)
1.EGR valve detectors, it is characterised in that including CPU, the signal processing circuit being connected respectively with CPU and EGR valve driving electricity
Road, the pin handover module being connected with signal processing circuit, and the DB15 interfaces being connected with pin handover module；The EGR
Valve-driving circuit is also connected with DB15 interfaces.
2. EGR valve detector according to claim 1, it is characterised in that the EGR valve drive circuit includes MCU, with
MOS drive circuit connected MCU, the active current foldback circuit being connected with MOS drive circuit, with active current foldback circuit phase
Passive current foldback circuit even；The MCU is connected by EGR position sensor signal acquisition circuit with CPU；The MOS drives
Dynamic circuit is connected by MOS with DB15 interfaces.
3. EGR valve detector according to claim 1 or 2, it is characterised in that also include the display screen being connected with CPU.
4. EGR valve detector according to claim 3, it is characterised in that also include the SD storage cards being connected with CPU.
5. EGR valve detector according to claim 3, it is characterised in that the CPU selects LPC1788.
6. EGR valve detector according to claim 3, it is characterised in that the pin handover module is by multiple relays
Composition.
7. the EGR valve detector according to any one of claim 4~6, it is characterised in that also include being used to accommodate CPU, letter
Number process circuit, pin handover module, EGR valve drive circuit, the housing (1) of SD storage cards, the display screen (2) are located at housing
Surface, the DB15 interfaces are located at housing side.
8. EGR valve detector according to claim 7, it is characterised in that also include being arranged in housing and with CPU being connected
Key-press module；The surface of shell is provided with the button (3) being connected with key-press module.
9. EGR valve detector according to claim 1 or 2, it is characterised in that the signal processing circuit includes phase successively
Protection circuit, Signal Matching and attenuator circuit even, signal amplification circuit；The Signal Matching and attenuator circuit switch with pin
Module is connected, and the signal amplification circuit is connected with CPU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720964135.9U CN207114156U (en) | 2017-08-03 | 2017-08-03 | EGR valve detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720964135.9U CN207114156U (en) | 2017-08-03 | 2017-08-03 | EGR valve detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207114156U true CN207114156U (en) | 2018-03-16 |
Family
ID=61572557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720964135.9U Active CN207114156U (en) | 2017-08-03 | 2017-08-03 | EGR valve detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207114156U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107202691A (en) * | 2017-08-03 | 2017-09-26 | 深圳市山水动力科技有限公司 | EGR valve detector |
-
2017
- 2017-08-03 CN CN201720964135.9U patent/CN207114156U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107202691A (en) * | 2017-08-03 | 2017-09-26 | 深圳市山水动力科技有限公司 | EGR valve detector |
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