CN204941634U - Engine oil pressure protective circuit - Google Patents
Engine oil pressure protective circuit Download PDFInfo
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- CN204941634U CN204941634U CN201520496630.2U CN201520496630U CN204941634U CN 204941634 U CN204941634 U CN 204941634U CN 201520496630 U CN201520496630 U CN 201520496630U CN 204941634 U CN204941634 U CN 204941634U
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Abstract
The utility model relates to a kind of engine oil pressure protective circuit, comprise pressure signal testing circuit, tach signal testing circuit, flameout control circuit, power circuit and there is the single-chip microcomputer of delay function, described power circuit is used for powering for engine oil protector, described pressure signal testing circuit is for monitoring the engine oil pressure signal of oil leab, and pass to single-chip microcomputer, described tach signal testing circuit is for monitoring engine rotational speed signal, and pass to single-chip microcomputer, engine rotational speed signal and speed setting value compare by described single-chip microcomputer, engine oil pressure signal and pressure set points are compared, export control signal to flameout control circuit, flameout control circuit is for controlling the closed of flameout switch or disconnecting, for controlling, motor is flame-out immediately shuts down or delayed extinction shutdown.It can ensure that motor can not because of lacking machine oil or lubrication pressure is too small, insufficient lubrication and cause the moving element locking such as engine crankshaft to damage motor.
Description
Technical field
The utility model relates to a kind of engine protection device, particularly a kind of engine oil pressure protective circuit.
Background technique
During engine operation, a lot of driving parts is all under very little gap, do high speed relative movement, as crankshaft main journal and main bearing, crank pin and connecting rod bearing, cam journal and camshaft bearing, piston, piston ring and cylinder wall surface, each kinematic pair of distribution device and driving gear pair etc.Although the working surface of these parts is all through meticulous processing, it is rough for amplifying these surfaces.If do not lubricate these surfaces, between them, strong friction will be there is.Dry friction between metal surface not only increases the power consumpiton of motor, accelerates the wearing and tearing on part time job surface, but also may, because fricative heat is by part time job surface scaling loss, cause motor to operate.The function of lubrication system is exactly the friction surface that continuously quantity is enough, temperature is suitable when engine operation clean machine oil is transported to whole driving component, and oil film is formed between friction surface, realize liquid friction, thus reduce surface friction drag, reduce power consumpiton, alleviate component wear, to reach the object improving engine operation reliability and durability.
Existing twin cylinder engine lubrication system is oil pump pressure lubrication, and whether the machine oil protective system adopted at present can only detect engine oil level the same as common unit be lower than prescribed limit, when pasta is lower than then allowing engine misses during limit.Can normally run higher than motor during engine oil sensor limit liquid level at machine oil liquid level, but to reveal if there is oil pump or oil leab blocking causes the crucial lubricant housings such as engine crankshaft cannot generate oil film because engine oil pressure is too small or rupture of oil film can cause engine lubrication bad and locking, occur the situation of engine damage.
Summary of the invention
In order to overcome the above-mentioned deficiency of prior art; the utility model provides a kind of engine oil pressure protective circuit, and this engine oil pressure protective circuit can ensure that motor can not because of lacking machine oil or lubrication pressure is too small, insufficient lubrication and cause the moving element locking such as engine crankshaft to damage motor.
The technical solution of the utility model is: a kind of engine oil pressure protective circuit, comprise pressure signal testing circuit, tach signal testing circuit, flameout control circuit, power circuit and there is the single-chip microcomputer of delay function, described power circuit is used for powering for engine oil protector, described pressure signal testing circuit is for monitoring the engine oil pressure signal of oil leab, and pass to single-chip microcomputer, the input end of described tach signal testing circuit is connected with the spark coil of igniter is elementary, for monitoring engine rotational speed signal, and pass to single-chip microcomputer, described single-chip microcomputer is for receiving engine rotational speed signal and engine oil pressure signal, engine rotational speed signal and speed setting value are compared, engine oil pressure signal and pressure set points are compared, export control signal to flameout control circuit, described flameout control circuit is for controlling the closed of flameout switch or disconnecting, for controlling, motor is flame-out immediately shuts down or delayed extinction shutdown.
Described pressure signal testing circuit comprises the 8th diode D8, the 8th resistance R8, the 9th resistance R9, the 5th electric capacity C5, the negative pole of the 8th diode D8 is connected with pressure transducer, the negative pole of the 8th diode D8 is through interrupteur SW connecting analog ground, the positive pole of the 8th diode D8 is connected with one end of the 8th resistance R8, the other end of the 8th resistance R8 is connected with one end of the first input end of single-chip microcomputer, the 9th resistance R9, one end of the 5th electric capacity C5 respectively, the other end of the 9th resistance R9, the other end digital grounding of the 5th electric capacity C5.
Described tach signal testing circuit comprises the 3rd triode Q3 and resistance, electric capacity, the collector electrode of the 3rd triode Q3 respectively with the second input end of single-chip microcomputer, one end of 3rd electric capacity C3 connects, the other end of the 3rd electric capacity C3 is connected rear digital grounding with the emitter of the 3rd triode Q3, the base stage of the 3rd triode Q3 respectively with one end of the 3rd resistance R3, one end of 5th resistance R5, one end of 4th electric capacity C4 connects, the other end connecting analog ground of the 5th resistance R5, the other end of the 3rd resistance R3 respectively with the emitter of the 3rd triode Q3, the positive pole of switching diode D2-1, the other end of the 4th electric capacity C4 connects, the negative pole of switching diode D2-1 is connected with the voltage output end of spark coil.
Described flameout control circuit comprises the 4th triode Q4, three-terminal voltage-stabilizing a reference source Q1 and resistance, electric capacity, the emitter of the 4th triode Q4 connects the output terminal VCC of power circuit, the base stage of the 4th triode Q4 respectively with one end of the 11st resistance R11, one end of 10th resistance R10 connects, the other end of the 11st resistance R11 connects the output terminal VCC of power circuit, 10th the other end of resistance R10 is connected with the output terminal of single-chip microcomputer, the collector electrode of the 4th triode Q4 respectively with one end of the 12nd resistance R12, the positive pole of the 7th electric capacity C7 connects, the negative pole of the 7th electric capacity C7 respectively with the positive pole of the 6th diode D6, one end of 13rd resistance R13 connects, the negative pole digital grounding of the 6th diode D6, the other end of the 13rd resistance R13 is connected with flameout switch, the other end of the 12nd resistance R12 respectively with one end of the 6th electric capacity C6, the control pole of three-terminal voltage-stabilizing a reference source Q1 connects, the other end of the 6th electric capacity C6 and the negative electrode of three-terminal voltage-stabilizing a reference source Q1, flameout switch connects, the anode connecting analog ground of three-terminal voltage-stabilizing a reference source Q1.
The beneficial effects of the utility model are: engine oil protector of the present utility model engine oil pressure lower than during limit value by the primary air of spark coil energising bonding; ensure that motor will cause the moving element lockings such as engine crankshaft to damage motor because of lacking machine oil or the too small insufficient lubrication of lubrication pressure; and can oil pressure sensor be coordinated again; when can avoid engine start; the inadequate sensor conducts situation of oil pressure, makes to start function normally to start and can make to start function normal ignition.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of engine oil protector of the present utility model.
In accompanying drawing, 1 is single-chip microcomputer, and 2 is pressure signal testing circuit, and 3 is tach signal testing circuit, and 4 is flameout control circuit, and 5 is power circuit.
Embodiment
See Fig. 1; a kind of engine oil pressure protective circuit; comprise pressure signal testing circuit 2, tach signal testing circuit 3, flameout control circuit 4, power circuit 5 and there is the single-chip microcomputer 1 of delay function; described power circuit is used for powering for engine oil protector; described pressure signal testing circuit is for monitoring the engine oil pressure signal of oil leab; and pass to single-chip microcomputer; the input end of described tach signal testing circuit is connected with the spark coil of igniter is elementary; for monitoring engine rotational speed signal, and pass to single-chip microcomputer.The voltage of the elementary generation of engine igniting coil is fluctuation, and rule is consistent with engine speed.Voltage according to the elementary generation of engine igniting coil can obtain engine speed.Described single-chip microcomputer is for receiving engine rotational speed signal and engine oil pressure signal; engine rotational speed signal and speed setting value are compared; engine oil pressure signal and pressure set points are compared; export control signal to flameout control circuit; described flameout control circuit is for controlling the closed of flameout switch or disconnecting, and for controlling, motor is flame-out immediately shuts down or delayed extinction shutdown.Flameout switch is used to the energising bonding of the primary air of control point fire coil.Engine oil protector engine oil pressure lower than during limit value by the primary air of spark coil energising bonding.The described single-chip microcomputer of the present embodiment adopts model to be the singlechip chip of PIC12F609.Arrange unidirectional isolating diode D4, unidirectional isolating diode D5 in protector, for preventing from mutually leaping up between several igniter, fire affects motor normal ignition.The present embodiment igniter is two, corresponding twin cylinder engine.
The voltage VCC that described power circuit is used for stable output powers to engine oil protector.The input end of power circuit can the interchange output of external vehicle power or direct current export, and also can be powered by the voltage output end of spark coil.When the external vehicle-mounted ac power supply of input end or the Vehicular direct-current power supply of power circuit, power circuit can adopt DC-DC conversion electric power module or AC-DC conversion electric power module external AC power supply or DC electrical source to be converted to stable voltage VCC and power to engine oil protector.When the input end of power circuit is powered by the voltage output end of spark coil, power circuit can be designed to following circuit: this power circuit comprises the 2nd triode Q2, reference diode DW and resistance, electric capacity, the base stage of described 2nd triode Q2 respectively with one end of the 1st resistance R1, the negative pole of reference diode DW connects, the positive pole of reference diode DW is connected with the positive pole of the 1st diode D1, the negative pole connecting analog ground of the 1st diode D1, the positive pole digital grounding of reference diode DW, the other end of the 1st resistance R1 respectively with one end of the 2nd resistance R2, the negative electrode of the 2nd switching diode D2-2 connects, 2nd negative electrode of switching diode D2-2 is connected with the voltage output end of spark coil, the other end of the 2nd resistance R2 is connected with the collector electrode of the 2nd triode Q2, the emitter of the 2nd triode Q2 respectively with the positive pole of the 1st electric capacity C1, one end of 2nd electric capacity C2, the output terminal VCC of power circuit, the positive terminal VDD of power supply of single-chip microcomputer connects, the negative pole of the 1st electric capacity C1, the other end of the 2nd electric capacity C2, the power-terminal VSS digital grounding of single-chip microcomputer.
Described pressure signal testing circuit comprises the 8th diode D8, the 8th resistance R8, the 9th resistance R9, the 5th electric capacity C5, the negative pole of the 8th diode D8 is connected with pressure transducer, the negative pole of the 8th diode D8 is through interrupteur SW connecting analog ground, the positive pole of the 8th diode D8 is connected with one end of the 8th resistance R8, the other end of the 8th resistance R8 is connected with one end of the first input end of single-chip microcomputer, the 9th resistance R9, one end of the 5th electric capacity C5 respectively, the other end of the 9th resistance R9, the other end digital grounding of the 5th electric capacity C5.
Described tach signal testing circuit comprises the 3rd triode Q3 and resistance, electric capacity, the collector electrode of the 3rd triode Q3 respectively with the second input end of single-chip microcomputer, one end of 3rd electric capacity C3 connects, the other end of the 3rd electric capacity C3 is connected rear digital grounding with the emitter of the 3rd triode Q3, the base stage of the 3rd triode Q3 respectively with one end of the 3rd resistance R3, one end of 5th resistance R5, one end of 4th electric capacity C4 connects, the other end connecting analog ground of the 5th resistance R5, the other end of the 3rd resistance R3 respectively with the emitter of the 3rd triode Q3, the positive pole of switching diode D2-1, the other end of the 4th electric capacity C4 connects, the negative pole of switching diode D2-1 is connected with the voltage output end of spark coil.
Described flameout control circuit comprises the 4th triode Q4, three-terminal voltage-stabilizing a reference source Q1 and resistance, electric capacity, the emitter of the 4th triode Q4 connects the output terminal VCC of power circuit, the base stage of the 4th triode Q4 respectively with one end of the 11st resistance R11, one end of 10th resistance R10 connects, the other end of the 11st resistance R11 connects the output terminal VCC of power circuit, 10th the other end of resistance R10 is connected with the output terminal of single-chip microcomputer, the collector electrode of the 4th triode Q4 respectively with one end of the 12nd resistance R12, the positive pole of the 7th electric capacity C7 connects, the negative pole of the 7th electric capacity C7 respectively with the positive pole of the 6th diode D6, one end of 13rd resistance R13 connects, the negative pole digital grounding of the 6th diode D6, the other end of the 13rd resistance R13 is connected with flameout switch, the other end of the 12nd resistance R12 respectively with one end of the 6th electric capacity C6, the control pole of three-terminal voltage-stabilizing a reference source Q1 connects, the other end of the 6th electric capacity C6 and the negative electrode of three-terminal voltage-stabilizing a reference source Q1, flameout switch connects, the anode connecting analog ground of three-terminal voltage-stabilizing a reference source Q1.
Working principle of the present utility model is: the tach signal of the single-chip microcomputer process motor of engine oil protector and realize delay function.Engine oil protector engine oil pressure lower than during limit value by the primary air of spark coil energising bonding.Turn during engine start at about 600rpm, at this moment oil pump rotating speed is lower, and engine oil pressure is also corresponding very low.When general engine speed is in 500-800rpm, motor is the ignition trigger stage.If raised at the normal rear engine rotating speed that runs, oil pump rotating speed is corresponding rising also, and engine oil pressure also can increase.After changing to oil pressure sensor from fuel level sensor, there will be motor when starting motor main oil gallery inner engine oil pressure lower than engine oil pressure during normal operation, in order to the motor that adequately protects, between engine oil pressure when engine oil pressure when the restriction of oil pressure sensor has been selected in engine start and motor normally run, when so just appearing in startup, motor can not normal ignition, in order to make to start function normal ignition, be provided with in engine oil protector and can ensure the normal program started: engine oil protector is for receiving engine rotational speed signal and engine oil pressure signal, engine rotational speed signal and speed setting value are compared, engine oil pressure signal and pressure set points are compared, judge the running state of motor.If engine oil protector detects that oil pressure is lower than limit value and pressure set points; when engine speed is less than the first speed setting value 800rpm; engine oil protector judges that motor is in the ignition trigger stage; then engine oil protector do not produce protection act namely do not allow spark coil primary air energising bonding, make to start function normal ignition.First speed setting value 800rpm be engine oil pressure that balance motor each rotating speed is corresponding in conjunction with oil pressure sensor select system come fixed.When engine oil protector detects that oil pressure is lower than limit value and pressure set points; when engine speed is greater than second speed setting value 815 ± 15rpm; engine oil protector judges that motor is in normal operating phase, and the slow 1.7S of engine oil protector produces the primary air energising bonding of protection act by spark coil.After engine start, rotating speed can be elevated to rapidly the tachometer value of client's adjustment, and 1.7S is to ensure the startup that motor is good, and too the situation that can not normally start likely appears in short engine; If lower than limit value, engine oil protector does not produce protection act to engine oil pressure time oversize, motor just may damage because of insufficient lubrication.When motor normally runs, oil pressure sensor senses that oil pressure is then protected immediately lower than limit value engine oil protector, and is in guard mode before the unsuccessful shutdown of motor always.Rotating speed remain on client adjustment tachometer value time (allowing slight fluctuation), motor is in normal operating phase.
Claims (4)
1. an engine oil pressure protective circuit, it is characterized in that: comprise pressure signal testing circuit, tach signal testing circuit, flameout control circuit, power circuit and there is the single-chip microcomputer of delay function, described power circuit is used for powering for engine oil protector, described pressure signal testing circuit is for monitoring the engine oil pressure signal of oil leab, and pass to single-chip microcomputer, the input end of described tach signal testing circuit is connected with the spark coil of igniter is elementary, for monitoring engine rotational speed signal, and pass to single-chip microcomputer, described single-chip microcomputer is for receiving engine rotational speed signal and engine oil pressure signal, engine rotational speed signal and speed setting value are compared, engine oil pressure signal and pressure set points are compared, export control signal to flameout control circuit, described flameout control circuit is for controlling the closed of flameout switch or disconnecting, for controlling, motor is flame-out immediately shuts down or delayed extinction shutdown.
2. engine oil pressure protective circuit according to claim 1, it is characterized in that: described pressure signal testing circuit comprises the 8th diode (D8), 8th resistance (R8), 9th resistance (R9), 5th electric capacity (C5), the negative pole of the 8th diode (D8) is connected with pressure transducer, the negative pole of the 8th diode (D8) is through interrupteur SW connecting analog ground, the positive pole of the 8th diode (D8) is connected with one end of the 8th resistance (R8), the other end of the 8th resistance (R8) respectively with the first input end of single-chip microcomputer, one end of 9th resistance (R9), one end of 5th electric capacity (C5) connects, the other end of the 9th resistance (R9), the other end digital grounding of the 5th electric capacity (C5).
3. engine oil pressure protective circuit according to claim 1, it is characterized in that: described tach signal testing circuit comprises the 3rd triode (Q3) and resistance, electric capacity, the collector electrode of the 3rd triode (Q3) respectively with the second input end of single-chip microcomputer, one end of 3rd electric capacity (C3) connects, the other end of the 3rd electric capacity (C3) is connected rear digital grounding with the emitter of the 3rd triode (Q3), the base stage of the 3rd triode (Q3) respectively with one end of the 3rd resistance (R3), one end of 5th resistance (R5), one end of 4th electric capacity (C4) connects, the other end connecting analog ground of the 5th resistance (R5), the other end of the 3rd resistance (R3) respectively with the emitter of the 3rd triode (Q3), the positive pole of switching diode (D2-1), the other end of the 4th electric capacity (C4) connects, the negative pole of switching diode (D2-1) is connected with the voltage output end of spark coil.
4. engine oil pressure protective circuit according to claim 1, it is characterized in that: described flameout control circuit comprises the 4th triode (Q4), three-terminal voltage-stabilizing a reference source (Q1) and resistance, electric capacity, the emitter of the 4th triode (Q4) connects the output terminal VCC of power circuit, the base stage of the 4th triode (Q4) respectively with one end of the 11st resistance (R11), one end of 10th resistance (R10) connects, the other end of the 11st resistance (R11) connects the output terminal VCC of power circuit, the other end of the 10th resistance (R10) is connected with the output terminal of single-chip microcomputer, the collector electrode of the 4th triode (Q4) respectively with one end of the 12nd resistance (R12), the positive pole of the 7th electric capacity (C7) connects, the negative pole of the 7th electric capacity (C7) respectively with the positive pole of the 6th diode (D6), one end of 13rd resistance (R13) connects, the negative pole digital grounding of the 6th diode (D6), the other end of the 13rd resistance (R13) is connected with flameout switch, the other end of the 12nd resistance (R12) respectively with one end of the 6th electric capacity (C6), the control pole of three-terminal voltage-stabilizing a reference source (Q1) connects, the other end of the 6th electric capacity (C6) and the negative electrode of three-terminal voltage-stabilizing a reference source (Q1), flameout switch connects, the anode connecting analog ground of three-terminal voltage-stabilizing a reference source (Q1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520496630.2U CN204941634U (en) | 2015-07-10 | 2015-07-10 | Engine oil pressure protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520496630.2U CN204941634U (en) | 2015-07-10 | 2015-07-10 | Engine oil pressure protective circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204941634U true CN204941634U (en) | 2016-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520496630.2U Expired - Fee Related CN204941634U (en) | 2015-07-10 | 2015-07-10 | Engine oil pressure protective circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN204941634U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104948258A (en) * | 2015-07-10 | 2015-09-30 | 隆鑫通用动力股份有限公司 | Engine oil pressure protector based on single chip microcomputer |
-
2015
- 2015-07-10 CN CN201520496630.2U patent/CN204941634U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104948258A (en) * | 2015-07-10 | 2015-09-30 | 隆鑫通用动力股份有限公司 | Engine oil pressure protector based on single chip microcomputer |
| CN104948258B (en) * | 2015-07-10 | 2018-07-13 | 隆鑫通用动力股份有限公司 | SCM Based engine oil pressure protector |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160106 Termination date: 20200710 |