CN102678351A - Intelligent diesel engine runaway protector - Google Patents
Intelligent diesel engine runaway protector Download PDFInfo
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- CN102678351A CN102678351A CN2012101509043A CN201210150904A CN102678351A CN 102678351 A CN102678351 A CN 102678351A CN 2012101509043 A CN2012101509043 A CN 2012101509043A CN 201210150904 A CN201210150904 A CN 201210150904A CN 102678351 A CN102678351 A CN 102678351A
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- diesel engine
- control circuit
- runaway
- valve
- driving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Output Control And Ontrol Of Special Type Engine (AREA)
- High-Pressure Fuel Injection Pump Control (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses an intelligent diesel engine runaway protector, which comprises a control circuit and an execution element, the control circuit converts the rotational speed signal of a diesel engine into a voltage signal, compares the voltage signal with set runaway threshold voltage Vf, and judges whether the runaway of the diesel engine takes place according to a comparison result; if runaway duration Tf is longer than runaway limiting time T0, then the control circuit outputs a corresponding signal to control the execution element to operate; and the execution element is used for reacting to the opening and closing of the oil supply circuit of the diesel engine according to the signal outputted by the control circuit. The intelligent diesel engine runaway protector can monitor the operating condition of the diesel engine in real time, can be self- diagnosed, and can judge whether the runaway of the diesel engine is false or true in order to prevent misoperation. A two-position three-way electromagnetic valve is adopted as the execution element to directly act on the oil supply circuit of the diesel engine, is small, and can reliably operate. The intelligent diesel engine runaway protector can be adjusted to control the runaway speeds of different diesel engines.
Description
Technical field
The present invention relates to a kind of protective gear of diesel engine, especially can On-Board Diagnostics, the identification Runaway of Diesel Engine, and cut off diesel engine master oil feeding line, thus the protective gear of protection diesel engine.
Background technique
At present, the common working method of Overspeed of diesel Engine protective gear has: 1. control the diesel engine intake valve, when " driving " appearred in diesel engine, suction valve was closed in manual work, and the blocking-up air continues to get into cylinder, thereby diesel engine is stopped, and reached the purpose of protection.This equipment mechanism is complicated, and is bulky, owing to adopt artificial judgment, operation, therefore, occurs misoperation easily; 2. act directly on stopping on the oily arm (cutoff device) of Injection Pump through executive component (solenoid valve, motor, hydraulic servo motor etc.), promote injection pump rack and get back to zero fuel feeding position, the fuel delivery that makes Injection Pump is zero, thereby makes engine cut-off.The required work moment of more this " driving " protective gear is big, and functional reliability is not high.
Summary of the invention
Complicated, bulky in order to overcome existing driving protective gear mechanism, misoperation appears easily, the shortcoming that functional reliability is not high.The present invention provides a kind of driving protective gear, and this device can not only be judged whether driving of diesel engine, and can On-Board Diagnostics, and differentiating diesel engine is true driving, and still false driving is avoided misoperation.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of Runaway of Diesel Engine protective gear comprises control circuit and executive component, and control circuit is transformed into voltage signal with the tach signal of diesel engine, and with " driving " threshold voltage V that configures
fRelatively, judge according to comparative result whether diesel engine " driving " takes place; " if driving " duration T
fGreater than " driving " limiting time T
0, control circuit is then exported the work of corresponding SC sigmal control executive component; Said executive component is used for signal the opening and closing and make a response the diesel engine oil feeding line according to said control circuit output.
Described Runaway of Diesel Engine protective gear, said control circuit comprises: tach signal is gathered change-over circuit, " driving " decision circuitry, " driving " time decision circuitry and logic control circuit.
Described Runaway of Diesel Engine protective gear, said executive component are two-position three way magnetic valve, and this solenoid valve is according to signal the opening and cutting out and make a response the diesel engine oil feeding line of said control circuit output.
Described Runaway of Diesel Engine protective gear, said executive component comprises: valve body (1), spool (2), Returnning spring (7), bonnet (9), electromagnet (10), electromagnet push-rod (3); Normally open valve mouth (A), valve-closed port (B), oil-feed valve port (P), return port (L) are set in the valve body (1); The low pressure oil supply oil circuit (12) of the Injection Pump of diesel engine (11) is connected with said normally open valve mouth (A), and return tube (16) is connected with said valve-closed port (B); When diesel engine is in the proper functioning rotating speed; Said control circuit output low level; Relay in the control circuit is in off state; Spool (2) is under the effect of Returnning spring (7) spring force near bonnet (9) one sides, and oil-feed valve port (P) communicates with normally open valve mouth (A), and valve-closed port (B) is closed; When true " driving " takes place in diesel engine, control circuit output high level, the relay closes in the control circuit; Electromagnet (10) energising; The thrust of electromagnet push-rod (3) moves to away from bonnet (9) one sides spool (2), and the shoulder of spool (2) makes normally open valve mouth (A) sealing, and oil-feed valve port (P) communicates with valve-closed port (B); Fuel oil directly flows back to fuel tank through valve-closed port (B), thereby does not have fuel oil to spray into the engine cylinder internal combustion.
The invention has the beneficial effects as follows: in real time the operating conditions of diesel engine is monitored, ability On-Board Diagnostics, the true and false driving of differentiation diesel engine prevent misoperation.Executive component adopts two-position three way magnetic valve directly to act on diesel engine master oil feeding line, and volume is little, reliable operation.This device can satisfy the requirement of the different Runaway of Diesel Engine rotating speeds of control through adjustment.
Description of drawings
Fig. 1 is the control circuit schematic diagram, and 1-1 is a theory diagram; 1-2 is circuit theory diagrams.
Fig. 2 is the executive component sectional arrangement drawing.
Fig. 3 is the embodiment's of driving protective gear a tectonic maps.
Among Fig. 2,1, valve body; 2, spool; 3, push rod; 4, supported spring; 5, spring seat; 6,0 shape ring support; 7, Returnning spring; 8, return spring holder; 9, bonnet; 10, electromagnet.
Among Fig. 3,11, Injection Pump; 12,14,18 is the low pressure oil supply pipe; 13, executive component; 15, diesel-oil filter; 16, return tube; 17, fuel tank; 19, fuel sucking pipe; 20, high-pressure oil feed pipe; 21,22, return tube.
Embodiment
Below in conjunction with specific embodiment, the present invention is elaborated.
In Fig. 1, control circuit is the core of Overspeed of diesel Engine protective gear, comprising: tach signal is gathered change-over circuit, " driving " judging unit, " driving " time judging unit and logic control element.Its schematic diagram is:
1. gather in the change-over circuit at tach signal, the present invention adopts gear velocity sensor that the rotating speed of diesel engine is carried out signals collecting.Relation between frequency and the rotating speed is:
Wherein, n (r/min) is the rotating speed of diesel engine, f
In(Hz) be the frequency of output electrical signal, Z is the flywheel number of teeth.
LM2907 integrated form frequency, electric pressure converter are adopted in the voltage to frequency conversion.LM2907 only needs the small number of peripheral element can realize frequency conversion is become the function of voltage, and frequency input signal f
InAnd output voltage V
OutRelation in direct ratio:
V
out＝f
in×V
cc×C
3×R
1×k (2)
2. in the driving judging unit, the driving judging unit is with the output voltage V of LM2907 FV convertor
OutAs input voltage and " driving " threshold voltage V of having configured
fRelatively, if V
OutLess than V
f, the work of expression diesel engine is normal, otherwise, then take place by " driving ".Among the present invention, adopt the LT1014 integrated voltage comparator to carry out voltage ratio, V
fSize can be through regulating slide rheostat RV in " driving " decision circuitry
1Resistance change, to satisfy the highest design speed n of different diesel engines
fRequirement.
3. in " driving " time judging unit, through " driving " duration T
fJudge that diesel engine is true " driving " or false " driving "." if driving " duration T
fLess than " driving " limiting time T
0(≤5s), this moment, diesel engine was false " driving "; " if driving " time T
fGreater than " driving " limiting time, be true " driving " this moment.
4. in logic control element, the output signal of " driving " time judging unit is carried out logic judge, and the output control signal corresponding.When logic control circuit detects that " driving " time, decision circuitry was output as low level, the logic control circuit output low level, executive component is failure to actuate; Otherwise, then continue the output high level, this moment relay closes, the oil feeding line of closed electromagnetic valve Injection Pump stops to stop up to diesel engine to the diesel engine fuel feeding.
In addition, control circuit of the present invention also has the function that can reset after the executive component action, and the fail protection function of control circuit.Like Fig. 1,, close oil feeding line when the executive component action; After diesel engine stopped, relay R L1 continued to connect, and oil feeding line remains closed condition; After treating that the Overspeed of diesel Engine fault is got rid of; If want to restart diesel engine, then must click SR S1 earlier, for the output terminal Q of trigger resets.When control circuit breaks down, can not correctly judge and control, can adopt manual fail safe button S2 operation executive component, close the oil feeding line of Injection Pump, thereby play the purpose of protection diesel engine.
With reference to figure 2, be the structural representation of executive component of the present invention, its essence is a two-position three way magnetic valve, the energising switching-over through solenoid valve can realize opening and closing of Injection Pump oil feeding line.Wherein A is the normally open valve mouth, and B is a valve-closed port, and P is the oil-feed valve port, and L is the oil return interface.When this executive component is used for the present invention, press Fig. 3 and be connected with correlated parts.Wherein, the normally open valve mouth A of the low pressure oil supply oil circuit 12 of Injection Pump 11 and executive component 13 is connected, and return tube 16 is connected with the valve-closed port B of executive component 13.When diesel engine is in the proper functioning rotating speed; The control circuit output low level, the relay in the control circuit is in off state, and spool 2 is under the effect of Returnning spring 7 spring forces near bonnet 9 one sides; Oil-feed valve port P communicates with A; Valve port B is closed, and this moment, low pressure oil supply pipe 12, low pressure oil supply pipe 14, low pressure oil supply pipe 18, the fuel sucking pipe 19 of Injection Pump were opened, and fuel oil gets into Injection Pump 11 through diesel-oil filter 15 through valve port P; After high-pressure oil feed pipe 20 sprays into and burns in the diesel engine, and unnecessary diesel oil flows back to fuel tank 17 through return tube 21, return tube 22.When true " driving " takes place in diesel engine, control circuit output high level, the relay closes in the control circuit; Electromagnet 10 energisings, the thrust of electromagnet push-rod 3 moves to away from bonnet 9 one sides spool 2, and the shoulder of spool 2 makes normally open valve mouth A sealing; This moment, low pressure oil supply pipe 12, low pressure oil supply pipe 14, low pressure oil supply pipe 18, the fuel sucking pipe 19 of Injection Pump broke off, and oil-feed valve port P communicates with valve-closed port B, and fuel oil directly flows back to fuel tank through valve port B; Thereby do not have fuel oil to spray into the engine cylinder internal combustion, play the effect of oil-break, engine speed is progressively reduced; Until shutdown, reach the purpose of protection motor.
Should be understood that, concerning those of ordinary skills, can improve or conversion, and all these improvement and conversion all should belong to the protection domain of accompanying claims of the present invention according to above-mentioned explanation.
Claims (4)
1. Runaway of Diesel Engine protective gear, it is characterized in that: comprise control circuit and executive component, control circuit is transformed into voltage signal with the tach signal of diesel engine, and with " driving " threshold voltage V that configures
fRelatively, judge according to comparative result whether diesel engine " driving " takes place; " if driving " duration T
fGreater than " driving " limiting time T
0, control circuit is then exported the work of corresponding SC sigmal control executive component; Said executive component is used for signal the opening and closing and make a response the diesel engine oil feeding line according to said control circuit output.
2. Runaway of Diesel Engine protective gear according to claim 1 is characterized in that: said control circuit comprises: tach signal is gathered change-over circuit, " driving " decision circuitry, " driving " time decision circuitry and logic control circuit.
3. Runaway of Diesel Engine protective gear according to claim 1 is characterized in that: said executive component is a two-position three way magnetic valve, and this solenoid valve is according to signal the opening and cutting out and make a response the diesel engine oil feeding line of said control circuit output.
4. Runaway of Diesel Engine protective gear according to claim 3 is characterized in that: said executive component comprises: valve body (1), spool (2), Returnning spring (7), bonnet (9), electromagnet (10), electromagnet push-rod (3); Normally open valve mouth (A), valve-closed port (B), oil-feed valve port (P), return port (L) are set in the valve body (1); The low pressure oil supply oil circuit (12) of the Injection Pump of diesel engine (11) is connected with said normally open valve mouth (A), and return tube (16) is connected with said valve-closed port (B); When diesel engine is in the proper functioning rotating speed; Said control circuit output low level; Relay in the control circuit is in off state; Spool (2) is under the effect of Returnning spring (7) spring force near bonnet (9) one sides, and oil-feed valve port (P) communicates with normally open valve mouth (A), and valve-closed port (B) is closed; When true " driving " takes place in diesel engine, control circuit output high level, the relay closes in the control circuit; Electromagnet (10) energising; The thrust of electromagnet push-rod (3) moves to away from bonnet (9) one sides spool (2), and the shoulder of spool (2) makes normally open valve mouth (A) sealing, and oil-feed valve port (P) communicates with valve-closed port (B); Fuel oil directly flows back to fuel tank through valve-closed port (B), thereby does not have fuel oil to spray into the engine cylinder internal combustion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101509043A CN102678351A (en) | 2012-05-14 | 2012-05-14 | Intelligent diesel engine runaway protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101509043A CN102678351A (en) | 2012-05-14 | 2012-05-14 | Intelligent diesel engine runaway protector |
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| CN102678351A true CN102678351A (en) | 2012-09-19 |
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ID=46810808
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|---|---|---|---|
| CN2012101509043A Pending CN102678351A (en) | 2012-05-14 | 2012-05-14 | Intelligent diesel engine runaway protector |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527318A (en) * | 2013-10-09 | 2014-01-22 | 潍柴动力股份有限公司 | Electronic control diesel engine galloping protecting method and device |
| CN104071151A (en) * | 2014-06-06 | 2014-10-01 | 潍柴动力股份有限公司 | Method, device and system for protecting aerodyne |
| CN104153892A (en) * | 2014-05-16 | 2014-11-19 | 玉柴联合动力股份有限公司 | Integrated diesel engine capable of braking inside cylinder forced by external controller |
| WO2015168965A1 (en) * | 2014-05-05 | 2015-11-12 | 奉化市远东深海采矿技术研究所 | Electromagnetic eddy-current damping speed-limiting device for preventing engine run-away accident |
| CN105422298A (en) * | 2015-12-30 | 2016-03-23 | 广西玉柴机器股份有限公司 | Emergency stop control method for engine |
| CN106054862A (en) * | 2016-06-23 | 2016-10-26 | 中车大连机车车辆有限公司 | Diesel generating set anti-runaway device and control method |
| CN106286047A (en) * | 2016-09-12 | 2017-01-04 | 上海中船三井造船柴油机有限公司 | A kind of fuel oil automatic cut-off device of marine low speed diesel engine |
| CN113889974A (en) * | 2021-09-24 | 2022-01-04 | 华南农业大学 | Protection device based on mechanical centrifugal switch and relay and control method |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527318A (en) * | 2013-10-09 | 2014-01-22 | 潍柴动力股份有限公司 | Electronic control diesel engine galloping protecting method and device |
| CN103527318B (en) * | 2013-10-09 | 2016-01-13 | 潍柴动力股份有限公司 | A kind of electric-control diesel engine driving guard method and device |
| WO2015168965A1 (en) * | 2014-05-05 | 2015-11-12 | 奉化市远东深海采矿技术研究所 | Electromagnetic eddy-current damping speed-limiting device for preventing engine run-away accident |
| CN104153892B (en) * | 2014-05-16 | 2017-05-31 | 玉柴联合动力股份有限公司 | A kind of integrated diesel machine by peripheral control unit pressure cylinder inside brake |
| CN104153892A (en) * | 2014-05-16 | 2014-11-19 | 玉柴联合动力股份有限公司 | Integrated diesel engine capable of braking inside cylinder forced by external controller |
| CN104071151B (en) * | 2014-06-06 | 2017-01-11 | 潍柴动力股份有限公司 | Method, device and system for protecting aerodyne |
| CN104071151A (en) * | 2014-06-06 | 2014-10-01 | 潍柴动力股份有限公司 | Method, device and system for protecting aerodyne |
| CN105422298A (en) * | 2015-12-30 | 2016-03-23 | 广西玉柴机器股份有限公司 | Emergency stop control method for engine |
| CN106054862A (en) * | 2016-06-23 | 2016-10-26 | 中车大连机车车辆有限公司 | Diesel generating set anti-runaway device and control method |
| CN106054862B (en) * | 2016-06-23 | 2018-06-05 | 中车大连机车车辆有限公司 | Diesel generating set runaway control method |
| CN106286047A (en) * | 2016-09-12 | 2017-01-04 | 上海中船三井造船柴油机有限公司 | A kind of fuel oil automatic cut-off device of marine low speed diesel engine |
| CN113889974A (en) * | 2021-09-24 | 2022-01-04 | 华南农业大学 | Protection device based on mechanical centrifugal switch and relay and control method |
| CN113889974B (en) * | 2021-09-24 | 2022-06-28 | 华南农业大学 | Protection device based on mechanical centrifugal switch and relay and control method |
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Application publication date: 20120919 |