CN2649779Y - Time-delay cutting-on isolator - Google Patents
Time-delay cutting-on isolator Download PDFInfo
- Publication number
- CN2649779Y CN2649779Y CN 03250233 CN03250233U CN2649779Y CN 2649779 Y CN2649779 Y CN 2649779Y CN 03250233 CN03250233 CN 03250233 CN 03250233 U CN03250233 U CN 03250233U CN 2649779 Y CN2649779 Y CN 2649779Y
- Authority
- CN
- China
- Prior art keywords
- capacitor
- isolator
- circuit
- petrol engine
- resistance
- 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.)
- Expired - Fee Related
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- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
The utility model relates to an isolator used coordinately with a fuel level sensor in general machinery for controlling the job of an igniter of a petrol engine. The utility model consists of an isolator crust and a controlling circuit which is within the isolator, wherein the controlling circuit comprises a capacitor charging circuit and a capacitor discharging circuit and a resistance R1 is serially connected within the capacitor charging circuit. The isolator is characterized in that the igniter can not be cut off when the fuel level sensor is momentarily turned on under the effect from the outside, thus the petrol engine can be kept in a steady running all the time.
Description
Technical field
The utility model relates to and a kind ofly being used with fuel level sensor in general gasoline engines, in order to the isolator of control petrol engine igniter work.
Technical background
General gasoline engines is to lubricate by the machine oil in the crankcase in the course of the work, when the machine oil in the crankcase reduces to a certain degree, if untimely interpolation machine oil will damage petrol engine.Reach the function that when position warning can auto extinguishing shut down so petrol engine all possesses when the machine oil oil level, and this function is realized by a sensor and an isolator.Isolator mainly is made of the control circuit of shell and Qi Nei; two terminal, one end of isolator is connected with sensor; the other end is connected with the flame-out line of petrol engine igniter; when the machine oil oil level in the crankcase reaches the warning position; sensor produces action and connects; then make the isolator conducting, thereby make the petrol engine igniter flame-out and petrol engine is shut down.Yet the isolator that uses in the petrol engine only possesses the delay recovery function and does not possess time-delay conducting function at present; promptly after the sensor action; can guarantee the accurately flame-out shutdown of petrol engine; but if because accidental cause when making sensor produce the misoperation that moment connects, the petrol engine igniter is also wanted the corresponding circuit fire phenomenon that occurs.And in fact in Gasoline Engine Working Process; owing to reasons such as the effect of the vibration of petrol engine or inner cylinder pressure and extraneous high magnetic fields influences; tend to make sensor to produce random action and the moment connection; thereby isolator is also followed action and is made the cutoff of petrol engine igniter; this will make petrol engine rotational speed just change instability; directly influence the proper functioning of petrol engine; may cause petrol engine to shut down when serious, this all is not make that its antijamming capability is relatively poor to be caused because isolator does not possess the conducting of time-delay function.
The model utility content
Technical problem to be solved in the utility model provides a kind of isolator with time-delay conducting function, and when fuel level sensor produced the misoperation of moment connection owing to accidental cause, the petrol engine igniter circuit fire phenomenon can not occur.
Time-delay conducting isolator described in the utility model, comprise isolator shell and interior control circuit thereof, control circuit comprises capacitor charging circuit and capacitor discharging circuit, after wherein capacitor charging circuit is connected by diode D1, capacitor C 1 and diode D2, diode D1 is anodal to be connected with the flame-out line of petrol engine igniter, and diode D2 negative pole and gasoline engine oil level sensor are formed by connecting; Capacitor discharging circuit by capacitor C 1 with after resistance R 2 is connected, capacitor C 1 positive pole is connected with the controllable silicon SCR control utmost point, resistance R 2 is connected with the controllable silicon SCR negative electrode, and the controllable silicon SCR negative electrode is connected with the flame-out line of petrol engine igniter, plus earth forms, and also is in series with a resistance R 1 in capacitor charging circuit.
Time-delay conducting isolator described in the utility model, it is the resistance R 1 of having connected in the capacitor charging circuit in existing isolator control circuit, when sensor is connected, it can make the voltage of capacitor C 1 rise slowly, so when sensor moment connection, because the time is very short, the charging voltage of capacitor C 1 is little, electric current in the isolator capacitor discharging circuit does not reach the trigger current of controllable silicon SCR, and controllable silicon SCR is ended, and isolator can not make igniter flame-out.So owing to be subjected to ectocine when moment connects, cutoff or flame-out can not appear in igniter at sensor, petrol engine all the time can smooth operation.
Description of drawings
Now in conjunction with the accompanying drawings the utility model is described in further detail.
Fig. 1 is the circuit theory diagrams of time-delay conducting isolator control circuit described in the utility model.
A represents the contact firearm line that stops working, B representative sensor among the figure.
Embodiment
As shown in Figure 1, this control circuit comprises capacitor charging circuit and capacitor discharging circuit, after wherein capacitor charging circuit is connected by diode D1, capacitor C 1 and diode D2, diode D1 is anodal to be connected with the flame-out line of petrol engine igniter, and diode D2 negative pole and gasoline engine oil level sensor are formed by connecting; Capacitor discharging circuit by capacitor C 1 with after resistance R 2 is connected; capacitor C 1 positive pole is connected with the controllable silicon SCR control utmost point; resistance R 2 is connected with the controllable silicon SCR negative electrode; and the controllable silicon SCR negative electrode is connected with the flame-out line of petrol engine igniter; plus earth forms; also be in series with a resistance R 1 in capacitor charging circuit, capacitor C 2, C3 and resistance R 3 only play the protection controllable silicon SCR in the circuit.
The working principle of this circuit is:
When sensor does not move (sensor access failure), this circuit is not owing to constituting the loop, so controllable silicon SCR is ended the petrol engine proper functioning.
When sensor is connected for a long time owing to oil level reaches the warning position; positive peak current flows into the earth through diode D1, capacitor C 1, resistance R 1, diode D2 by flame-out line to sensor; and realize capacitor C 1 charging; capacitor C 1 after the charging is discharged through resistance R 3, controllable silicon SCR, resistance R 2, resistance R 1; when discharge current during greater than the trigger current of controllable silicon SCR; the controllable silicon SCR conducting, then flame-out line ground connection can not be worked igniter, and petrol engine is flame-out shuts down.
When sensor because when ectocine and momentary connection, positive peak current by flame-out line through diode D1, capacitor C 1, resistance R 1, diode D2 flows into the earth to sensor, and realize capacitor C 1 charging, because the effect of resistance R 1, make the charging voltage of capacitor C 1 little, disconnect back when not having posivtive spike voltage to occur (or) at sensor, capacitor C 1 is through resistance R 3, controllable silicon SCR, resistance R 2, resistance R 1 is discharged, and the discharge current of this moment is less than the trigger current of controllable silicon SCR, controllable silicon SCR is ended, until the voltage of capacitor C 1 being put, and can not make the cutoff of igniter ground connection all the time, so petrol engine normal operation work to zero.
Claims (1)
1, a kind of time-delay conducting isolator, comprise isolator shell and interior control circuit thereof, control circuit comprises capacitor charging circuit and capacitor discharging circuit, after wherein capacitor charging circuit is connected by diode D1, capacitor C 1 and diode D2, diode D1 is anodal to be connected with the flame-out line of petrol engine igniter, and diode D2 negative pole and gasoline engine oil level sensor are formed by connecting; Capacitor discharging circuit by capacitor C 1 with after resistance R 2 is connected, capacitor C 1 positive pole is connected with the controllable silicon SCR control utmost point, resistance R 2 is connected with the controllable silicon SCR negative electrode, and the controllable silicon SCR negative electrode is connected with the flame-out line of petrol engine igniter, plus earth forms, and it is characterized in that: also be in series with a resistance R 1 in capacitor charging circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03250233 CN2649779Y (en) | 2003-09-05 | 2003-09-05 | Time-delay cutting-on isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03250233 CN2649779Y (en) | 2003-09-05 | 2003-09-05 | Time-delay cutting-on isolator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2649779Y true CN2649779Y (en) | 2004-10-20 |
Family
ID=34327724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03250233 Expired - Fee Related CN2649779Y (en) | 2003-09-05 | 2003-09-05 | Time-delay cutting-on isolator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2649779Y (en) |
-
2003
- 2003-09-05 CN CN 03250233 patent/CN2649779Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |