CN2706590Y - Cooling protection alarm for automobile engine - Google Patents
Cooling protection alarm for automobile engine Download PDFInfo
- Publication number
- CN2706590Y CN2706590Y CN 200320125505 CN200320125505U CN2706590Y CN 2706590 Y CN2706590 Y CN 2706590Y CN 200320125505 CN200320125505 CN 200320125505 CN 200320125505 U CN200320125505 U CN 200320125505U CN 2706590 Y CN2706590 Y CN 2706590Y
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- water
- circuit
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- engine cooling
- protection alarm
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Abstract
The utility model relates to an automobile engine cooling protection alarm, which consists of a shell and an electronic circuit and is connected with an automobile body wiring harness through four ports; the ports are respectively connected with the anode and the cathode of an automobile power supply, a water temperature sensor on an engine and a water temperature sensor on a cooling water auxiliary water tank; the circuit comprises a voltage stabilizing circuit, a water tank water level oscillation anti-interference circuit, a water level and water temperature monitoring circuit, a buzzer alarm driving circuit and a buzzer alarm circuit. The automobile engine cooling protection alarm combines water temperature and water level alarm together, can find abnormal water level state of the water tank and temperature change of engine cooling water in time, ensures that drivers can find abnormal temperature and abnormal water level of the cooling water in time, ensures that an automobile maintains good running state, and plays a positive role in protecting an engine.
Description
Technical field: the utility model belongs to automotive electronics electrical apparatus technology category, relates to a kind of motor car engine cooling protection alarm.
Background technique: the temperature of automobile engine cooling water normally is to guarantee the good essential condition of motoring condition.Therefore, water-thermometer is housed all on the instrument panel of automobile, so that driver is observed the temperature variation of engine cooling water.Commonly used at present is the cooling water temperature indication, and the SEA LEVEL VARIATION of water tank cooling water is easily ignored by people, wait until that often cooling water uses up or judgement by rule of thumb adds water, be difficult in time grasp the cistern water level abnormal state, very easily motor is caused certain damage.
Summary of the invention: the utility model is difficult to the problem of grasp in time in order to solve existing automobile engine cooling water water level abnormality, a kind of motor car engine cooling protection alarm is proposed, it is characterized in that: described protection alarm is made up of shell and electronic circuit two-part, is connected with the automotive body wire harness by four ports; Described port connects the level sensor on cooling-water temperature sensor on automobile power source both positive and negative polarity, the motor and the secondary water tank of cooling water respectively; Described circuit comprises mu balanced circuit, cistern water level concussion anti-jamming circuit, water-level and water-temperature observation circuit, buzzer warning drive circuit and buzzer alarm circuit.
This motor car engine cooling protection alarm is incorporated into one with water temperature and water-level alarm; can find in time that the temperature of cistern water level abnormal state and engine cooling water is too high; guarantee that driver can find in time that the water-level and water-temperature of cooling water is unusual, the protection motor is played the positive important effect.
Description of drawings: Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment: this motor car engine cooling protection alarm; be made up of shell and electronic circuit two-part, be connected with the automotive body wire harness by four ports: described port connects the level sensor on cooling-water temperature sensor on automobile power source both positive and negative polarity, the motor and the secondary water tank of cooling water respectively.Wherein electronic circuit comprises mu balanced circuit, cistern water level concussion anti-jamming circuit, water-level and water-temperature observation circuit, buzzer warning drive circuit and buzzer alarm circuit.As shown in Figure 1, mu balanced circuit is composed in series by diode D1, resistance R 1, voltage stabilizer W1; The water-level and water-temperature observation circuit is made up of comparator U1, capacitor C 1, resistance R 2, R3, R4, R5, R6, R7, diode D2; The water level concussion is anti-interference mainly to be realized by capacitor C 1 and resistance R 2; Buzzer alarm circuit is made up of triode T2, resistance R 11, R12, R13, diode D4, Φ 35 buzz sheet; The drive circuit that buzzing is reported to the police is made up of triode T1, resistance R 8, R9, R10, diode D3.
Source current is entered behind the mu balanced circuit that diode in series D1, resistance R 1, voltage stabilizer W1 form by R3, R4, R5, the bleeder circuit formed by port one and arrives comparator U1, wherein R3, R4 series connection dividing potential drop is formed a benchmark input voltage of comparator, is connected on 3 pin of comparator U1 by R5.Capacitor C 1 is formed the water level signal input circlult with series resistors R2 after diode D5 and level sensor are in parallel, with 2 pin of resistance R 6 series connections at comparator U1, series diode D2 and resistance R 7 between 2 pin of comparator U1,7 pin, signal outputs to buzzing warning drive circuit through 7 pin of comparator U1.
The resistance R 8 of the drive circuit that buzzing is reported to the police is comparator output pull-up resistor, is used for improving U1 output load capacity; Resistance R 9, resistance R 10 are composed in series bleeder circuit, the base stage bias current are provided for triode T1, and diode D3 is connected on the T1 collector electrode.
The resistance R 12 of buzzer alarm circuit, R13 series connection provide the base stage bias current of triode T2, and feedback signal enters triode T2 base stage by the minimum substrate end of three end buzz sheet by resistance R 12, forms the self oscillations signal.Diode D4 oppositely is attempted by between the base stage and emitter of T2, is used for protecting triode T2.Resistance R 11 is connected on the emitter of T2, plays the current-limiting protection effect.
Comparator U1 selects the LM311 comparator for use; Φ 35 buzz sheet have been selected three end piezoelectric constant buzz sheet for use; Triode T1 selects 2SC2383 for use.Triode T2 selects 2SC1815 for use; Voltage-stabiliser tube W1 selects 1N4752 for use.
The circuit working principle: level sensor is a negative resistance characteristic, reduces along with water level increases resistance; Cooling-water temperature sensor is a switching characteristic, is equivalent to the short circuit state when water temperature is higher than certain value.When the water tank middle water level is low, when equivalent resistance approximated 30K Ω, comparator 7 pin were output as high level, and switch transistor T 1 saturation conduction triggers buzzer alarm circuit work.Be added to normal water level and work as the water tank middle water level, when equivalent resistance approximated 10K Ω, comparator 7 pin just overturn and are low level, and switch transistor T 1 is worn and ended, thereby disconnects buzzer alarm circuit, and at this moment the water tank middle water level is in normal state.When engine coolant temperature is higher than 90 ℃, the cooling-water temperature sensor make contact, at this moment 2 pin of alarm and 4 pin are equivalent to short circuit.Thereby startup buzzer alarm circuit.And when water temperature was reduced to certain value, the cooling-water temperature sensor contact disconnected, and the buzzer telegraph circuit is not worked.Buzzer alarm circuit is formed a self-oscillating circuit by transistor T2 and three end piezoelectric constant buzz sheet etc., and frequency is 2.9 ± 0.4KHZ.Can send volume during work is 80 ± 5dB, and frequency is the continuous sound signal of 2.9 ± 0.4KHZ, the prompting driver.
This alarm adopts common comparator to form observation circuit, form the self oscillation buzzer alarm circuit with elements such as three end buzz sheet and triodes, cross when low when detecting the too high or cistern water level of engine cooling water water temperature, can in time produce continuous audible ringing signal, remind the driver in time to handle problems, avoid causing unnecessary loss; This circuit structure is simple, the reliable performance practicality.
Claims (10)
1, a kind of motor car engine cooling protection alarm, it is characterized in that: described protection alarm is made up of shell and electronic circuit two-part, is connected with the automotive body wire harness by four ports; Described port connects the level sensor on cooling-water temperature sensor on automobile power source both positive and negative polarity, the motor and the secondary water tank of cooling water respectively; Described circuit comprises mu balanced circuit, cistern water level concussion anti-jamming circuit, water-level and water-temperature observation circuit, buzzer warning drive circuit and buzzer alarm circuit.
2, motor car engine cooling protection alarm as claimed in claim 1, it is characterized in that: described mu balanced circuit is composed in series by diode D1, resistance R 1, voltage stabilizer W1.
3, motor car engine cooling protection alarm as claimed in claim 1 is characterized in that: described cistern water level concussion anti-jamming circuit is connected with resistance R 2 after by diode D5 and capacitor C 1 and level sensor parallel connection.
4, motor car engine cooling protection alarm as claimed in claim 1 is characterized in that: the resistance R 3 of described water-level and water-temperature observation circuit, R4 series connection back are connected on 3 pin of comparator U1 by R5; Capacitor C 1 is formed the water level signal input circlult with series resistors R2 after diode D5 and level sensor are in parallel, with 2 pin of resistance R 6 series connections at comparator U1; Series diode D2 and resistance R 7 between 2 pin of comparator U1,7 pin, signal outputs to buzzing warning drive circuit through 7 pin of comparator U1.
5, motor car engine cooling protection alarm as claimed in claim 1, it is characterized in that: the resistance R 12 of described buzzer alarm circuit, R13 series connection provide the base stage bias current of triode T2, and feedback signal enters triode T2 base stage by the minimum substrate of three end buzz sheet by resistance R 12; Diode D4 oppositely is attempted by between the base stage and emitter of T2; Resistance R 11 is connected on the emitter of T2.
6, motor car engine cooling protection alarm as claimed in claim 1; it is characterized in that: the resistance R 9 and the resistance R 10 of described buzzing warning drive circuit are composed in series bleeder circuit; the base stage bias current is provided for triode T1; resistance R 8 is the 7 pin output pull-up resistor of comparator U1, and diode D3 is connected on the T1 collector electrode.
7, motor car engine cooling protection alarm as claimed in claim 1, it is characterized in that: described comparator U1 selects the LM311 comparator for use.
8, motor car engine cooling protection alarm as claimed in claim 1 is characterized in that: described buzz sheet has been selected three end piezoelectric constant buzz sheet for use.
9, motor car engine cooling protection alarm as claimed in claim 1, it is characterized in that: described triode T1 selects 2SC2383 for use; Triode T2 selects 2SC1815 for use.
10, motor car engine cooling protection alarm as claimed in claim 1, it is characterized in that: described voltage-stabiliser tube W1 selects 1N4752 for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320125505 CN2706590Y (en) | 2003-12-20 | 2003-12-20 | Cooling protection alarm for automobile engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320125505 CN2706590Y (en) | 2003-12-20 | 2003-12-20 | Cooling protection alarm for automobile engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2706590Y true CN2706590Y (en) | 2005-06-29 |
Family
ID=34845395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320125505 Expired - Lifetime CN2706590Y (en) | 2003-12-20 | 2003-12-20 | Cooling protection alarm for automobile engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2706590Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787921B (en) * | 2008-12-01 | 2012-06-20 | 通用汽车环球科技运作公司 | Engine cooling system diagnosis for applications with two coolant sensors |
-
2003
- 2003-12-20 CN CN 200320125505 patent/CN2706590Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787921B (en) * | 2008-12-01 | 2012-06-20 | 通用汽车环球科技运作公司 | Engine cooling system diagnosis for applications with two coolant sensors |
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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 | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20131220 Granted publication date: 20050629 |