CN202693608U - Engine rotation speed detecting device - Google Patents
Engine rotation speed detecting device Download PDFInfo
- Publication number
- CN202693608U CN202693608U CN 201220271826 CN201220271826U CN202693608U CN 202693608 U CN202693608 U CN 202693608U CN 201220271826 CN201220271826 CN 201220271826 CN 201220271826 U CN201220271826 U CN 201220271826U CN 202693608 U CN202693608 U CN 202693608U
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- engine
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- cpu
- photoelectrical coupler
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Abstract
The utility model discloses an engine rotation speed detecting device. The engine rotation speed change detecting device comprises a central processing unit, a circuit connection and disconnection detecting module, a power supply module, a control keyboard and a display unit, wherein the circuit connection and disconnection detecting module, a storage battery of a vehicle and an igniter of the vehicle are connected in series to form an ignition loop; and the central processing unit is respectively connected with an output end of the circuit connection and disconnection detecting module, the power supply module, the control keyboard and the display unit. The rotation speed of an engine is calculated by using an ignition signal of the engine, the device is not required to be mounted on the engine, and the device is not loosened or abraded through strong vibration of the engine.
Description
Technical field
The utility model relates to a kind of speed detector, relates in particular to a kind of engine speed detection device.
Background technology
The tachometer value of motor car engine is an important parameter in the motor car engine test.Existing engine speed detection device generally adopts Hall element to detect the rotation of a magnet of installing on engine shaft or the fan blade, thereby obtains the rotary speed data of engine.Yet the Hall element that is installed on the engine may occur because of the sharp pounding of engine loosening or wearing and tearing, and serious meeting causes Hall element to lose efficacy, and affects the carrying out of experiment work.
China Patent Publication No. CN201408199, open day on February 17th, 2010, the name of utility model is called rotating speed sensor for Hall gear, this application case discloses a kind of rotating speed sensor for Hall gear, comprise magnet, hall sensor and signal processing circuit, described hall sensor comprises two Hall chips, signal processing circuit comprises the differential amplifier that connects in turn, Hi-pass filter, Schmidt trigger and output interface circuit, output interface circuit is as the signal output part of whole signal processing circuit, and the output terminal of two Hall chips of described hall sensor all is connected with the input end of differential amplifier.Its weak point is, this rotating speed sensor for Hall gear is installed on the engine, may occur because of the sharp pounding of engine loosening or wearing and tearing, and serious meeting causes rotating speed sensor for Hall gear to lose efficacy.
The utility model content
The purpose of this utility model is to overcome the available engine speed detector need be installed on the engine, technical matterss loosening or wearing and tearing may occur because of the sharp pounding of engine, a kind of engine speed detection device is provided, it utilizes the rotating speed of the ignition signal calculation engine of engine, need not to be installed on the engine, can not occur because of the sharp pounding of engine loosening or wearing and tearing.
In order to address the above problem, the utility model is achieved by the following technical solutions:
A kind of engine speed detection device of the present utility model, comprise CPU (central processing unit), connecting and disconnecting of the circuit detection module, power module, supervisory keyboard and display unit, the accumulator of described connecting and disconnecting of the circuit detection module and automobile and lighter are connected into an ignition circuit, and described CPU (central processing unit) links to each other with output terminal, power module, supervisory keyboard and the display unit of connecting and disconnecting of the circuit detection module respectively.
In the technical program, the connecting and disconnecting of the circuit detection module detects the break-make of ignition circuit, and sends it to CPU (central processing unit).The principle of work of engine igniting system is: the accumulator output current, and ignition circuit is connected, and the lighter igniting stops output current at the instantaneous accumulator of lighting a fire.Lighter is lighted a fire once, a cylinder operation of engine, and the cylinder of engine is worked once successively, and engine is finished the one action circulation.The user can set the number of cylinders of this engine and the number of turns that bent axle rotates by supervisory keyboard according to engine type.
When carrying out engine test, engine igniting system is started working.CPU (central processing unit) is carried out timework according to the trigger pip control internal timer that the connecting and disconnecting of the circuit detection module sends, and calculates the time interval of adjacent twice igniting, and this time interval is the working time of some cylinders.The number of turns that CPU (central processing unit) is rotated according to time interval of adjacent twice igniting, cylinder number and bent axle calculates the rotating speed of engine, and shows at display unit.
As preferably, described connecting and disconnecting of the circuit detection module comprises photoelectrical coupler and pull-up resistor, the transmitting terminal of described photoelectrical coupler and the accumulator of automobile and lighter are connected into an ignition circuit, the receiving end positive pole of described photoelectrical coupler links to each other with CPU (central processing unit) one end with pull-up resistor one end respectively, the described pull-up resistor other end links to each other with power module, and the receiving end negative pole of described photoelectrical coupler links to each other with ground wire.When the accumulator output current, ignition circuit is connected, and photoelectrical coupler receiving end positive pole is in low level, and CPU (central processing unit) receives low level signal.When accumulator stopped output current, ignition circuit disconnected, and photoelectrical coupler receiving end positive pole is in high level, and CPU (central processing unit) receives high level signal.
As preferably, described display unit is LCDs.The rotary speed information of LCDs display automobile engine.
As preferably, described CPU (central processing unit) is the STC10F04 single-chip microcomputer.
The beneficial effects of the utility model are: utilize the rotating speed of the ignition signal calculation engine of engine, need not to be installed on the engine, can not occur because of the sharp pounding of engine loosening or wearing and tearing.
Description of drawings
Fig. 1 is that a kind of circuit theory of the present utility model connects block diagram.
Among the figure: 1, CPU (central processing unit), 2, power module, 3, supervisory keyboard, 4, display unit, 5, photoelectrical coupler, 6, pull-up resistor, 7, accumulator, 8, lighter.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: a kind of engine speed detection device of present embodiment, as shown in Figure 1, comprise CPU (central processing unit) 1, the connecting and disconnecting of the circuit detection module, power module 2, supervisory keyboard 3 and display unit 4, the connecting and disconnecting of the circuit detection module comprises photoelectrical coupler 5 and pull-up resistor 6, the transmitting terminal of photoelectrical coupler 5 and the accumulator of automobile 7 and lighter 8 are connected into an ignition circuit, the receiving end positive pole of photoelectrical coupler 5 links to each other with CPU (central processing unit) 1 with an end of pull-up resistor 6 respectively, the other end of pull-up resistor 6 and 2 anodal linking to each other of power module, the receiving end negative pole of photoelectrical coupler 5 links to each other with ground wire, CPU (central processing unit) 1 respectively with power module 2, supervisory keyboard 3 links to each other with display unit 4, display unit 4 is LCDs, and CPU (central processing unit) 1 is the STC10F04 single-chip microcomputer.
Power module 2 detects the break-make of ignition circuit for engine speed detection device power supply, photoelectrical coupler 5.When accumulator 7 output current, ignition circuit is connected, and photoelectrical coupler 5 receiving end positive poles are in low level, and CPU (central processing unit) 1 receives low level signal.When accumulator 7 stopped output current, ignition circuit disconnected, and photoelectrical coupler 5 receiving end positive poles are in high level, and CPU (central processing unit) 1 receives high level signal.
The principle of work of engine igniting system is: accumulator 7 output currents, and ignition circuit is connected, and lighter 8 igniting stop output current at the instantaneous accumulator 7 of lighting a fire.Lighter 8 is lighted a fire once, a cylinder operation of engine, and the cylinder of engine is worked once successively, and engine is finished the one action circulation.
The four cylinder four-stroke engine is carried out rotating speed detects, the number of cylinders that the user can set these engines by supervisory keyboard 3 be 4 and the bent axle number of turns of rotating be 2.When the four cylinder four-stroke engine carries out the rotating speed detection, engine igniting system is started working, the trigger pip that the 1 pair of photoelectrical coupler that receives 5 receiving end of CPU (central processing unit) send is processed, control simultaneously internal timer and carry out timework, the time interval value that calculates adjacent twice igniting is S, and namely the working time of some cylinders is S.Then engine time of finishing a working cycle according to current rotating speed is 4S.The number of turns that CPU (central processing unit) 1 is rotated according to time interval of adjacent twice igniting, cylinder number and bent axle calculates the rotational speed N of engine=2/(4S), and shows at display unit 4.
Claims (4)
1. engine speed detection device, it is characterized in that: comprise CPU (central processing unit) (1), connecting and disconnecting of the circuit detection module, power module (2), supervisory keyboard (3) and display unit (4), accumulator (7) and the lighter (8) of described connecting and disconnecting of the circuit detection module and automobile are connected into an ignition circuit, and described CPU (central processing unit) (1) links to each other with output terminal, power module (2), supervisory keyboard (3) and the display unit (4) of connecting and disconnecting of the circuit detection module respectively.
2. a kind of engine speed detection device according to claim 1, it is characterized in that: described connecting and disconnecting of the circuit detection module comprises photoelectrical coupler (5) and pull-up resistor (6), accumulator (7) and the lighter (8) of the transmitting terminal of described photoelectrical coupler (5) and automobile are connected into an ignition circuit, the receiving end positive pole of described photoelectrical coupler (5) links to each other with CPU (central processing unit) (1) one end with pull-up resistor (6) one ends respectively, described pull-up resistor (6) other end links to each other with power module (2), and the receiving end negative pole of described photoelectrical coupler (5) links to each other with ground wire.
3. a kind of engine speed detection device according to claim 1 and 2 is characterized in that: described display unit (4) is LCDs.
4. a kind of engine speed detection device according to claim 1 and 2 is characterized in that: described CPU (central processing unit) (1) is the STC10F04 single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220271826 CN202693608U (en) | 2012-06-08 | 2012-06-08 | Engine rotation speed detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220271826 CN202693608U (en) | 2012-06-08 | 2012-06-08 | Engine rotation speed detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202693608U true CN202693608U (en) | 2013-01-23 |
Family
ID=47549210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220271826 Expired - Fee Related CN202693608U (en) | 2012-06-08 | 2012-06-08 | Engine rotation speed detecting device |
Country Status (1)
| Country | Link |
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| CN (1) | CN202693608U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760376A (en) * | 2014-01-13 | 2014-04-30 | 山东理工大学 | Engine rotating speed measuring instrument based on vibration principle and test method thereof |
-
2012
- 2012-06-08 CN CN 201220271826 patent/CN202693608U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760376A (en) * | 2014-01-13 | 2014-04-30 | 山东理工大学 | Engine rotating speed measuring instrument based on vibration principle and test method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20140608 |