CN104948258B - SCM Based engine oil pressure protector - Google Patents
SCM Based engine oil pressure protector Download PDFInfo
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- CN104948258B CN104948258B CN201510403126.8A CN201510403126A CN104948258B CN 104948258 B CN104948258 B CN 104948258B CN 201510403126 A CN201510403126 A CN 201510403126A CN 104948258 B CN104948258 B CN 104948258B
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Abstract
The present invention relates to a kind of SCM Based engine oil pressure protectors, including pressure signal detection circuit, tach signal detection circuit, flameout control circuit, power circuit and microcontroller with delay function, the power circuit is used to power for engine oil protector, the pressure signal detection circuit is used to monitor the engine oil pressure signal of oil leab, and pass to microcontroller, the tach signal detection circuit is for monitoring engine rotational speed signal, and pass to microcontroller, engine rotational speed signal is compared by the microcontroller with speed setting value, engine oil pressure signal is compared with pressure set points, control signal is exported to flameout control circuit, flameout control circuit is used to control closure or the disconnection of flameout switch, for controlling engine, flame-out shutdown or delayed extinction are shut down immediately.It can ensure engine will not because of lack machine oil or lubrication pressure is too small, insufficient lubrication and cause engine crankshaft etc. moving components locking damage engine.
Description
Technical field
The present invention relates to a kind of engine protection device, more particularly to a kind of SCM Based engine oil pressure is protected
Protect device.
Background technology
When engine works, many driving parts are all to make high speed relative motion under the gap of very little, such as bent axle master
Axle journal and base bearing, crank-pin and the connecting-rod bearing, cam journal and camshaft bearing, piston, piston ring and cylinder wall surface, gazogene
Each kinematic pair of structure and driving gear pair etc..Although the working surface of these parts all pass through fine processing, amplification from the point of view of this
A little surfaces are rough.If not being lubricated to these surfaces, strong friction will occur between them.Metal surface
Between dry friction not only increase the power consumption of engine, accelerate the abrasion on part time job surface, but also may be due to rubbing
The heat generated is wiped by part time job surface scaling loss, causes engine that can not operate.The function of lubricating system is exactly in engine work
Continuously that quantity is enough when making, temperature clean machine oil appropriate is transported to the friction surface of whole driving members, and is rubbing
Wiping forms oil film between surface, realizes fluid friction, to reduce frictional resistance, reduce power consumption, mitigation component wear, with
Achieve the purpose that improve engine functional reliability and durability.
Existing bi-block engine lubricating system be lubricating oil pump forced feed lubrication, and the machine Oil protective system used at present with it is general
Logical single machine is the same can only to detect whether engine motor oil liquid level is less than prescribed limit, then engine is allowed to put out when pasta is less than limit
Fire.Machine oil liquid level be higher than engine oil sensor limit liquid level when engine can normal operation, but if there is lubricating oil pump leakage
Or oil leab blocking causes that the crucial lubricant housings such as engine crankshaft can not generate oil film because engine oil pressure is too small or oil film is broken
Splitting can cause engine lubrication bad and locking, the case where engine damage occur.
Invention content
In order to overcome the above-mentioned deficiency of the prior art, the present invention to provide a kind of SCM Based engine oil pressure
Protector can ensure that engine will not be because of lacking machine oil or profit based on the engine oil pressure protector of microcontroller
Lubricating oil such as presses through small, insufficient lubrication and causes engine crankshaft at the moving components locking damage engine.
The technical scheme is that：A kind of SCM Based engine oil pressure protector, including pressure signal
Detection circuit, tach signal detection circuit, flameout control circuit, power circuit and the microcontroller with delay function, it is described
Power circuit is used to power for engine oil protector, and the pressure signal detection circuit is used to monitor the engine oil pressure letter of oil leab
Number, and microcontroller is passed to, the input terminal of the tach signal detection circuit and the ignition coil primary of igniter connect, and are used for
Engine rotational speed signal is monitored, and passes to microcontroller, the microcontroller is for receiving engine rotational speed signal and oil pressure
Engine rotational speed signal is compared with speed setting value, engine oil pressure signal and pressure set points is compared by force signal
Compared with exporting control signal to flameout control circuit, the flameout control circuit is used to control closure or the disconnection of flameout switch, uses
In control engine, flame-out shutdown or delayed extinction are shut down immediately.
The pressure signal detection circuit includes the 8th diode D8, the 8th resistance R8, the 9th resistance R9, the 5th electricity
Hold C5, the cathode of the 8th diode D8 is connect with pressure sensor, and the cathode of the 8th diode D8 is simulated through switch SW connections
The anode on ground, the 8th diode D8 is connect with one end of the 8th resistance R8, the other end of the 8th resistance R8 respectively with microcontroller
First input end, the 9th resistance R9 one end, the 5th capacitance C5 one end connection, the other end of the 9th resistance R9, the 5th
The other end digital grounding of a capacitance C5.
The tach signal detection circuit includes the 3rd triode Q3 and resistance, capacitance, the collection of the 3rd triode Q3
Electrode is connect with one end of the second input terminal of microcontroller, the 3rd capacitance C3 respectively, the other end of the 3rd capacitance C3 and the 3rd
Digital grounding after the emitter connection of triode Q3, the base stage of the 3rd triode Q3 respectively with one end of the 3rd resistance R3, the 5th
One end connection of one end of a resistance R5, the 4th capacitance C4, the other end connection simulation ground of the 5th resistance R5, the 3rd resistance
The other end of R3 respectively with the emitter of the 3rd triode Q3, the anode of switching diode D2-1, the 4th capacitance C4 it is another
End connection, the cathode of switching diode D2-1 and the voltage output end of ignition coil connect.
The flameout control circuit include the 4th triode Q4, three-terminal voltage-stabilizing a reference source Q1 and resistance, capacitance, the 4th
The output end VCC of the emitter connection power circuit of triode Q4, the base stage of the 4th triode Q4 respectively with the 11st resistance
One end connection of one end of R11, the 10th resistance R10, the output end of the other end connection power circuit of the 11st resistance R11
The other end of VCC, the 10th resistance R10 and the output end of microcontroller connect, and the collector of the 4th triode Q4 is respectively with the 12nd
The anode connection of one end of a resistance R12, the 7th capacitance C7, the cathode of the 7th capacitance C7 is respectively with the 6th diode D6's
One end connection of anode, the 13rd resistance R13, the cathode digital grounding of the 6th diode D6, the 13rd resistance R13's is another
End is connect with flameout switch, the other end of the 12nd resistance R12 respectively with one end of the 6th capacitance C6, three-terminal voltage-stabilizing a reference source
The control pole of Q1 connects, and the other end of the 6th capacitance C6 is connect with cathode, the flameout switch of three-terminal voltage-stabilizing a reference source Q1, three ends
The anode connection simulation ground of voltage stabilizing a reference source Q1.
The beneficial effects of the invention are as follows：The engine oil protector of the present invention will igniting when engine oil pressure is less than limit value
The primary coil energization bonding of coil ensures that engine will not be made because machine oil or the too small insufficient lubrication of lubrication pressure is lacked
Engine is damaged at the moving components locking such as engine crankshaft, and engine oil pressure pickup can be coordinated again, engine can be avoided and opened
When dynamic, the inadequate sensor conducts situation of oil pressure makes that function is started normally to start and can make to start function normal ignition.
Description of the drawings
Fig. 1 is the circuit diagram of the engine oil protector of the present invention.
In attached drawing, 1 is microcontroller, and 2 be pressure signal detection circuit, and 3 be tach signal detection circuit, and 4 be flame-out control
Circuit, 5 be power circuit.
Specific implementation mode
Referring to Fig. 1, a kind of SCM Based engine oil pressure protector, including pressure signal detection circuit 2, turn
Fast signal deteching circuit 3, flameout control circuit 4, power circuit 5 and the microcontroller 1 with delay function, the power circuit
For powering for engine oil protector, the pressure signal detection circuit is used to monitor the engine oil pressure signal of oil leab, and passes
Microcontroller is passed, the input terminal of the tach signal detection circuit and the ignition coil primary of igniter connect, for monitoring hair
Motivation tach signal, and pass to microcontroller.The voltage that engine igniting coil primary generates is fluctuation, rule and engine
Rotating speed is consistent.The voltage generated according to engine igniting coil primary can obtain engine speed.The microcontroller is for connecing
Engine rotational speed signal and engine oil pressure signal are received, engine rotational speed signal is compared with speed setting value, by machine oil
Pressure signal is compared with pressure set points, exports control signal to flameout control circuit, the flameout control circuit is used for
Closure or the disconnection for controlling flameout switch, for controlling engine, flame-out shutdown or delayed extinction are shut down immediately.Flameout switch is
For control ignition coil primary coil energization bonding.Engine oil protector is when engine oil pressure is less than limit value by point
The primary coil energization bonding of firewire circle.The microcontroller of the present embodiment uses the singlechip chip of model PIC12F609.
Setting one-way isolation diode D4, one-way isolation diode D5 in protector, for preventing fire of mutually leaping up between several igniters
Influence engine normal ignition.The present embodiment igniter is two, corresponding bi-block engine.
The power circuit is powered for exporting stable voltage VCC to engine oil protector.The input terminal of power circuit can
Exchange output or the direct current output of vehicle power supply are connect in addition, can also be powered by the voltage output end of ignition coil.Work as power supply
When the external vehicle-mounted AC power of input terminal or Vehicular direct-current power supply of circuit, DC-DC conversion electric power moulds may be used in power circuit
External AC power or DC power supply are converted to stable voltage VCC to engine oil protector by block or AC-DC conversion electric powers module
Power supply.When the input terminal of power circuit is powered by the voltage output end of ignition coil, power circuit can be designed to as
Lower circuit：The power circuit includes the 2nd triode Q2, zener diode DW and resistance, capacitance, the 2nd triode
The base stage of Q2 is connect with the cathode of one end of the 1st resistance R1, zener diode DW respectively, the anode and the of zener diode DW
The anode connection of 1 diode D1, the cathode connection simulation ground of the 1st diode D1, the positive polar digital of zener diode DW connect
The other end on ground, the 1st resistance R1 is connect with the cathode of one end of the 2nd resistance R2, the 2nd switching diode D2-2 respectively,
The voltage output end connection of the cathode and ignition coil of 2nd switching diode D2-2, the other end and the 2nd of the 2nd resistance R2
The collector of a triode Q2 connects, the emitter of the 2nd triode Q2 respectively with the anode of the 1st capacitance C1, the 2nd capacitance
The positive terminals VDD connections of power supply of one end of C2, the output end VCC of power circuit, microcontroller, the cathode of the 1st capacitance C1,
The other end of 2 capacitance C2, the power supply of microcontroller bear terminals VSS digital groundings.
The pressure signal detection circuit includes the 8th diode D8, the 8th resistance R8, the 9th resistance R9, the 5th electricity
Hold C5, the cathode of the 8th diode D8 is connect with pressure sensor, and the cathode of the 8th diode D8 is simulated through switch SW connections
The anode on ground, the 8th diode D8 is connect with one end of the 8th resistance R8, the other end of the 8th resistance R8 respectively with microcontroller
First input end, the 9th resistance R9 one end, the 5th capacitance C5 one end connection, the other end of the 9th resistance R9, the 5th
The other end digital grounding of a capacitance C5.
The tach signal detection circuit includes the 3rd triode Q3 and resistance, capacitance, the collection of the 3rd triode Q3
Electrode is connect with one end of the second input terminal of microcontroller, the 3rd capacitance C3 respectively, the other end of the 3rd capacitance C3 and the 3rd
Digital grounding after the emitter connection of triode Q3, the base stage of the 3rd triode Q3 respectively with one end of the 3rd resistance R3, the 5th
One end connection of one end of a resistance R5, the 4th capacitance C4, the other end connection simulation ground of the 5th resistance R5, the 3rd resistance
The other end of R3 respectively with the emitter of the 3rd triode Q3, the anode of switching diode D2-1, the 4th capacitance C4 it is another
End connection, the cathode of switching diode D2-1 and the voltage output end of ignition coil connect.
The flameout control circuit include the 4th triode Q4, three-terminal voltage-stabilizing a reference source Q1 and resistance, capacitance, the 4th
The output end VCC of the emitter connection power circuit of triode Q4, the base stage of the 4th triode Q4 respectively with the 11st resistance
One end connection of one end of R11, the 10th resistance R10, the output end of the other end connection power circuit of the 11st resistance R11
The other end of VCC, the 10th resistance R10 and the output end of microcontroller connect, and the collector of the 4th triode Q4 is respectively with the 12nd
The anode connection of one end of a resistance R12, the 7th capacitance C7, the cathode of the 7th capacitance C7 is respectively with the 6th diode D6's
One end connection of anode, the 13rd resistance R13, the cathode digital grounding of the 6th diode D6, the 13rd resistance R13's is another
End is connect with flameout switch, the other end of the 12nd resistance R12 respectively with one end of the 6th capacitance C6, three-terminal voltage-stabilizing a reference source
The control pole of Q1 connects, and the other end of the 6th capacitance C6 is connect with cathode, the flameout switch of three-terminal voltage-stabilizing a reference source Q1, three ends
The anode connection simulation ground of voltage stabilizing a reference source Q1.
The operation principle of the present invention is that：The tach signal and realization delay work(of the microcontroller processing engine of engine oil protector
Energy.Engine oil protector is when engine oil pressure is less than limit value by the primary coil energization bonding of ignition coil.Engine opens
Turn in 600rpm or so when dynamic, at this moment machine oil revolution speed is relatively low, and engine oil pressure is also corresponding very low.General engine speed is in
When 500-800rpm, engine is igniting startup stage.If engine speed increases after normal operation, machine oil revolution speed
Corresponding to increase, engine oil pressure can also increase.After being changed to engine oil pressure pickup from fuel level sensor, it may appear that hair
Motivation on startup engine main oil gallery inner engine oil pressure be less than normal operation when engine oil pressure, start to adequately protect
Engine oil pressure when machine, the limitation of engine oil pressure pickup have been selected in engine start and oil pressure when engine normal operation
Between power, it thus will appear engine on startup and be unable to normal ignition, in order to make to start function normal ignition, protected in machine oil
It is provided with the program that can ensure normally to start in shield device：Engine oil protector is for receiving engine rotational speed signal and oil pressure
Engine rotational speed signal is compared with speed setting value, engine oil pressure signal and pressure set points is compared by force signal
Compared with judging the operating status of engine.If engine oil protector detects that oil pressure is less than limit value i.e. pressure set points, engine
When rotating speed is less than the first speed setting value 800rpm, engine oil protector judges that engine is in igniting startup stage, then machine oil
Protector does not generate protection act and does not allow the primary coil energization bonding of ignition coil, makes to start function normal ignition.First
Speed setting value 800rpm is that the selected system of the corresponding engine oil pressure combination oil pressure sensor of tradeoff each rotating speed of engine is next fixed.When
Engine oil protector detects that oil pressure is less than limit value i.e. pressure set points, engine speed be more than the second speed setting value 815 ±
When 15rpm, engine oil protector judges that engine is in normal operating phase, and the slow 1.7S of engine oil protector generates protection act and is
By the primary coil energization bonding of ignition coil.Rotating speed will rise rapidly the tachometer value of client's adjustment after engine start,
1.7S is to ensure that the good startup of engine, too short engine are possible to the case where cannot normally starting occur；When too long
If engine oil pressure less than limit value and engine oil protector does not generate protection act, engine can damage because of insufficient lubrication
It is bad.When engine normal operation, oil pressure sensor senses that oil pressure is then protected immediately less than limit value engine oil protector, and
Engine is constantly in guard mode before shutting down not successfully.When rotating speed is maintained at the tachometer value of client's adjustment（Allow to have slight
Fluctuation）, engine is in normal operating phase.
Claims (4)
1. a kind of SCM Based engine oil pressure protector, it is characterised in that：Including pressure signal detection circuit, turn
Fast signal deteching circuit, flameout control circuit, power circuit and the microcontroller with delay function, the power circuit are used for
It powers for engine oil protector, the pressure signal detection circuit is used to monitor the engine oil pressure signal of oil leab, and passes to
Microcontroller, the input terminal of the tach signal detection circuit and the ignition coil primary of igniter connect, for monitoring engine
Tach signal, and microcontroller is passed to, the microcontroller is used to receive engine rotational speed signal and engine oil pressure signal, and will
Engine rotational speed signal is compared with speed setting value, judges the operating status of engine, while by engine oil pressure signal
It is compared with pressure set points, exports control signal to flameout control circuit, the flameout control circuit is flame-out for controlling
The closure of switch or disconnection, for controlling engine, flame-out shutdown or delayed extinction are shut down immediately；The pressure set points are located at
Between engine oil pressure when engine oil pressure when engine start and engine normal operation, if microcontroller detects low oil pressure
In pressure set points, when engine speed is less than the first speed setting value, microcontroller judges that engine is in igniting and starts rank
Section, then engine oil protector do not generate protection act i.e. microcontroller do not allow flameout control circuit control engine misses shut down, make hair
Motivation energy normal ignition；When microcontroller detects that oil pressure is less than pressure set points, engine speed is more than the second speed setting value
When, microcontroller judges that engine is in normal operating phase, and it is single that the slow set period of time of engine oil protector, which generates protection act,
Piece machine controls flameout control circuit delayed extinction and shuts down；When engine normal operation, oil pressure sensor senses that oil pressure is less than
When pressure set points, engine oil protector generates the flame-out shutdown immediately of protection act i.e. microcontroller control flameout control circuit immediately,
And it is constantly in guard mode before engine is shut down not successfully.
2. SCM Based engine oil pressure protector according to claim 1, it is characterised in that：The pressure
Signal deteching circuit includes diode D8, resistance R8, resistance R9, capacitance C5, and the cathode of diode D8 is connect with pressure sensor,
The cathode of diode D8 simulates ground through switch SW connections, and the anode of diode D8 is connect with one end of resistance R8, and resistance R8's is another
One end is connect with one end of the first input end of microcontroller, one end of resistance R9, capacitance C5 respectively, the other end, the electricity of resistance R9
Hold the other end digital grounding of C5.
3. SCM Based engine oil pressure protector according to claim 1, it is characterised in that：The rotating speed
Signal deteching circuit includes triode Q3 and resistance, capacitance, and the collector of triode Q3 is inputted with the second of microcontroller respectively
One end connection at end, capacitance C3, digital grounding after the other end of capacitance C3 is connect with the emitter of triode Q3, triode Q3's
Base stage is connect with one end of one end of resistance R3, one end of resistance R5, capacitance C4 respectively, the other end connection simulation of resistance R5
The other end on ground, resistance R3 connects with the other end of the emitter of triode Q3, the anode of switching diode D2-1, capacitance C4 respectively
It connects, the cathode of switching diode D2-1 and the voltage output end of ignition coil connect.
4. SCM Based engine oil pressure protector according to claim 1, it is characterised in that：It is described flame-out
Control circuit includes triode Q4, three-terminal voltage-stabilizing a reference source Q1 and resistance, capacitance, the emitter connection power supply electricity of triode Q4
The base stage of the output end VCC on road, triode Q4 are connect with one end of one end of resistance R11, resistance R10 respectively, and resistance R11's is another
One end connects the output end VCC of power circuit, and the other end of resistance R10 and the output end of microcontroller connect, the collection of triode Q4
Electrode is connect with the anode of one end of resistance R12, capacitance C7 respectively, the cathode of capacitance C7 respectively with the anode of diode D6, electricity
One end connection of R13 is hindered, the cathode digital grounding of diode D6, the other end of resistance R13 is connect with flameout switch, resistance R12
The other end connect respectively with the control pole of one end of capacitance C6, three-terminal voltage-stabilizing a reference source Q1, the other end of capacitance C6 and three ends
The cathode of voltage stabilizing a reference source Q1, flameout switch connection, the anode connection simulation ground of three-terminal voltage-stabilizing a reference source Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510403126.8A CN104948258B (en) | 2015-07-10 | 2015-07-10 | SCM Based engine oil pressure protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510403126.8A CN104948258B (en) | 2015-07-10 | 2015-07-10 | SCM Based engine oil pressure protector |
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| Publication Number | Publication Date |
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| CN104948258A CN104948258A (en) | 2015-09-30 |
| CN104948258B true CN104948258B (en) | 2018-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510403126.8A Active CN104948258B (en) | 2015-07-10 | 2015-07-10 | SCM Based engine oil pressure protector |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB490521A (en) * | 1937-01-12 | 1938-08-12 | David Willett Fleetwood Dallin | Improvements in or relating to pressure fed lubricating systems |
| CN2152078Y (en) * | 1993-01-05 | 1994-01-05 | 陈志平 | Lubrication system safety monitor |
| CN2674116Y (en) * | 2004-01-14 | 2005-01-26 | 曹泽兴 | Protection means for engine |
| 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 |
| CN204941634U (en) * | 2015-07-10 | 2016-01-06 | 隆鑫通用动力股份有限公司 | Engine oil pressure protective circuit |
-
2015
- 2015-07-10 CN CN201510403126.8A patent/CN104948258B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB490521A (en) * | 1937-01-12 | 1938-08-12 | David Willett Fleetwood Dallin | Improvements in or relating to pressure fed lubricating systems |
| CN2152078Y (en) * | 1993-01-05 | 1994-01-05 | 陈志平 | Lubrication system safety monitor |
| CN2674116Y (en) * | 2004-01-14 | 2005-01-26 | 曹泽兴 | Protection means for engine |
| 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 |
| CN204941634U (en) * | 2015-07-10 | 2016-01-06 | 隆鑫通用动力股份有限公司 | Engine oil pressure protective circuit |
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| Publication number | Publication date |
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| CN104948258A (en) | 2015-09-30 |
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