CN105041410A - Engine oil pressure monitoring and protecting system of single-cylinder engine - Google Patents
Engine oil pressure monitoring and protecting system of single-cylinder engine Download PDFInfo
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- CN105041410A CN105041410A CN201510403121.5A CN201510403121A CN105041410A CN 105041410 A CN105041410 A CN 105041410A CN 201510403121 A CN201510403121 A CN 201510403121A CN 105041410 A CN105041410 A CN 105041410A
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Abstract
The invention relates to an engine oil pressure monitoring and protecting system of a single-cylinder engine. The engine oil pressure monitoring and protecting system comprises a pressure sensor, an engine oil protector and an igniter; a secondary ignition coil of the igniter is electrically connected with a spark plug, a primary ignition coil of the igniter is connected with one end of a flameout switch, and the other end of the flameout switch is grounded; a first input end of the engine oil protector is connected with the primary ignition coil of the igniter to collect an engine revolution speed signal, and a second input end of the engine oil protector is connected with the pressure sensor to collect an engine oil pressure signal of a lubricating oil passage; the engine oil protector compares the engine revolution speed signal with a revolution speed set value, compares the engine oil pressure signal with a pressure set value and outputs a control signal to the flameout switch to control the engine to stall and stop. According to the engine oil pressure monitoring and protecting system, it can be guaranteed that the engine cannot be damaged due to the fact that motion parts such as an engine crankshaft are locked due to the facts that engine oil is lacked or the lubricating oil pressure is too small or lubricating is bad.
Description
Technical field
The present invention relates to a kind of engine protection device, particularly a kind of single-cylinder engine machine oil hydraulic monitoring and protecting system.
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 invention provides a kind of single-cylinder engine machine oil hydraulic monitoring and protecting system, this single-cylinder engine machine oil hydraulic monitoring and protecting system 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.
Technological scheme of the present invention is: a kind of single-cylinder engine machine oil hydraulic monitoring and protecting system, comprise pressure transducer, engine oil protector and an igniter, the ignition coil secondary of described igniter is electrically connected with spark plug, the spark coil of igniter is elementary to be connected with one end of flameout switch, the other end ground connection of flameout switch, the first input end of described engine oil protector is connected with the spark coil of igniter is elementary, for gathering engine rotational speed signal, second input end of described engine oil protector is connected with pressure transducer, for gathering the engine oil pressure signal of oil leab, described 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, export control signal to flameout switch, shut down for controlling engine misses.
Described engine oil protector comprises processor, pressure signal testing circuit, tach signal testing circuit, flameout control circuit, delay circuit, power circuit, 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 processor, the input end of described tach signal testing circuit is connected with spark coil is elementary, for monitoring engine rotational speed signal, and pass to processor, described processor 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, shut down for controlling engine misses, the time delay that described delay circuit is shut down for controlling engine misses.
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 processor, 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 processor, 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 processor, 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 invention has the beneficial effects as follows: engine oil protector of the present invention 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 schematic block circuit diagram of the present invention;
Fig. 2 is the circuit diagram of engine oil protector of the present invention.
In accompanying drawing, 1 is pressure transducer, and 2 is engine oil protector; 21 is processor, and 22 is pressure signal testing circuit, and 23 is tach signal testing circuit; 24 is flameout control circuit, and 25 is power circuit, and 3 is spark coil; 4 is flameout switch; 5 is engine lubricating oil main oil gallery, and 6 is spark plug, and 7 is motor; 8 is flywheel, and 9 is magnetic pole.
Embodiment
See Fig. 1 and Fig. 2, a kind of single-cylinder engine machine oil hydraulic monitoring and protecting system, comprises pressure transducer 1, engine oil protector 2 and an igniter.Pressure transducer 1 is for monitoring the pressure of engine lubricating oil main oil gallery 5.Spark coil 3 levels of described igniter are electrically connected with spark plug 6; the spark coil 3 of igniter is elementary to be connected with one end of flameout switch 4; the other end ground connection of flameout switch 4; the first input end of described engine oil protector 2 is connected with the spark coil 3 of igniter is elementary; for gathering engine rotational speed signal; the voltage of the elementary generation of engine igniting coil 3 is fluctuation, and rule is consistent with engine speed.Voltage according to the elementary generation of engine igniting coil 3 can obtain engine speed.Second input end of described engine oil protector 2 is connected with pressure transducer 1; for gathering the engine oil pressure signal of oil leab; described engine oil protector 2 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; exporting control signal to flameout switch 4, shutting down for controlling engine misses.Described engine oil protector 2 comprises processor 21, pressure signal testing circuit 22, tach signal testing circuit 23, flameout control circuit 24, delay circuit, power circuit 25, described power circuit 25 is for powering for engine oil protector 2, described pressure signal testing circuit 22 is for monitoring the engine oil pressure signal of oil leab, and pass to processor 21, the input end of described tach signal testing circuit 23 is connected with spark coil 3 is elementary, for monitoring engine rotational speed signal, and pass to processor 21, described processor 21 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 24, described flameout control circuit 24 is for controlling the closed of flameout switch 4 or disconnecting, shut down for controlling engine misses, the time delay that described delay circuit is shut down for controlling engine misses.Flameout switch 4 is used to the energising bonding of the primary air of control point fire coil 3.Engine oil protector 2 engine oil pressure lower than during limit value by the primary air of spark coil 3 energising bonding.Magnetic pole 9 is contained on flywheel 8, and magnetic pole 9 more rotates with flywheel 8, and the magnetic pole 9 of rotation provides the magnetic flux of change to realize igniting for spark coil 3 for spark coil 3.Delay circuit outside placement processor 21, also can be arranged in processor 21, realize delay function by processor 21.Described processor 21 can adopt single-chip microcomputer.The described processor 21 of the present embodiment adopts model to be the singlechip chip of PIC12F609.
Described power circuit 25 is powered to engine oil protector 2 for the voltage VCC of stable output.The input end of power circuit 25 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 3.When the external vehicle-mounted ac power supply of input end or the Vehicular direct-current power supply of power circuit 25, power circuit 25 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 2.When the input end of power circuit 25 is powered by the voltage output end of spark coil 3, power circuit 25 can be designed to following circuit: this power circuit 25 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, the negative electrode of the 2nd switching diode D2-2 is connected with the voltage output end of spark coil 3, 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 25, the positive terminal VDD of power supply of processor 21 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 processor 21.
Described pressure signal testing circuit 22 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 1, 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 processor 21, 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 23 comprises the 3rd triode Q3 and resistance, electric capacity, the collector electrode of the 3rd triode Q3 respectively with the second input end of processor 21, 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 3.
Described flameout control circuit 24 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 25, 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 25, the other end of the 10th resistance R10 is connected with the output terminal of processor 21, 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 4, 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 4 connects, the anode connecting analog ground of three-terminal voltage-stabilizing a reference source Q1.
Working principle of the present invention is: the processor 21 of engine oil protector 2 processes the tach signal of motor 7 and realizes delay function.Engine oil protector 2 engine oil pressure lower than during limit value by the primary air of spark coil 3 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 1 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 1 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 2 and can ensure the normal program started: engine oil protector 2 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 2 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 2 judges that motor is in the ignition trigger stage; then engine oil protector 2 do not produce protection act namely do not allow spark coil 3 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 2 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 2 judges that motor is in normal operating phase, and engine oil protector 2 late 1.7S produces the primary air energising bonding of protection act by spark coil 3.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 2 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 protected immediately lower than limit value engine oil protector 2, 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 (5)
1. a single-cylinder engine machine oil hydraulic monitoring and protecting system, it is characterized in that: comprise pressure transducer, engine oil protector and an igniter, the ignition coil secondary of described igniter is electrically connected with spark plug, the spark coil of igniter is elementary to be connected with one end of flameout switch, the other end ground connection of flameout switch, the first input end of described engine oil protector is connected with the spark coil of igniter is elementary, for gathering engine rotational speed signal, second input end of described engine oil protector is connected with pressure transducer, for gathering the engine oil pressure signal of oil leab, described 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, export control signal to flameout switch, shut down for controlling engine misses.
2. single-cylinder engine machine oil hydraulic monitoring and protecting system according to claim 1, it is characterized in that: described engine oil protector comprises processor, pressure signal testing circuit, tach signal testing circuit, flameout control circuit, delay circuit, power circuit, 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 processor, the input end of described tach signal testing circuit is connected with spark coil is elementary, for monitoring engine rotational speed signal, and pass to processor, described processor 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, shut down for controlling engine misses, the time delay that described delay circuit is shut down for controlling engine misses.
3. single-cylinder engine machine oil hydraulic monitoring and protecting system according to claim 2, 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 processor, 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).
4. single-cylinder engine machine oil hydraulic monitoring and protecting system according to claim 2, 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 processor, 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.
5. single-cylinder engine machine oil hydraulic monitoring and protecting system according to claim 2, 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 processor, 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).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510403121.5A CN105041410B (en) | 2015-07-10 | 2015-07-10 | Single-cylinder engine machine oil hydraulic monitoring and protecting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510403121.5A CN105041410B (en) | 2015-07-10 | 2015-07-10 | Single-cylinder engine machine oil hydraulic monitoring and protecting system |
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| CN105041410B CN105041410B (en) | 2018-07-13 |
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| US20030062209A1 (en) * | 2001-09-28 | 2003-04-03 | Suzuki Motor Corporation | Vehicle-mounted four-cycle engine control device |
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| CN201687546U (en) * | 2010-05-26 | 2010-12-29 | 尹华勇 | Remote control startup monitoring circuit for automobile |
| CN204941699U (en) * | 2015-07-10 | 2016-01-06 | 隆鑫通用动力股份有限公司 | Single Cylinder Gasoline Engine lubricating oil monitoring protective gear |
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2015
- 2015-07-10 CN CN201510403121.5A patent/CN105041410B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4054117A (en) * | 1976-01-28 | 1977-10-18 | Palmer Howard J | Oil pressure failure protection device for internal combustion engines |
| US4136660A (en) * | 1977-11-14 | 1979-01-30 | Palmer Howard J | Oil pressure failure protection device for internal combustion engines |
| US20030062209A1 (en) * | 2001-09-28 | 2003-04-03 | Suzuki Motor Corporation | Vehicle-mounted four-cycle engine control device |
| CN201367928Y (en) * | 2009-02-24 | 2009-12-23 | 华南农业大学 | Automotive petrol engine alarming protection system based on engine oil pressure |
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