CN108092396A

CN108092396A - Diesel engine stops in emergency Electromagnetic Valve Circuit failover, warning circuit and its method

Info

Publication number: CN108092396A
Application number: CN201711233972.5A
Authority: CN
Inventors: 田阿利; 邵长斌; 王长宝
Original assignee: Jiangsu University of Science and Technology
Current assignee: Jiangsu University of Science and Technology
Priority date: 2017-11-30
Filing date: 2017-11-30
Publication date: 2018-05-29

Abstract

It stops in emergency Electromagnetic Valve Circuit failover, warning circuit and its method the invention discloses a kind of diesel engine, circuit is, there is the Electromagnetic Valve Circuit that stops in emergency of undercurrent detection electric current relay, over-current detection electric current relay including string, stop in emergency spare Electromagnetic Valve Circuit, Electromagnetic Valve Circuit overcurrent of stopping in emergency and its switch failure fault control circuit, it stops in emergency solenoid valve undercurrent switching control circuit, to switch failure short-circuit detecting circuit in the Electromagnetic Valve Circuit that stops in emergency and corresponding alarm circuit.Method is; parking power-fail is directly switch to stand-by power supply and powers and carry out indicator light prompting; spare solenoid valve is switched to when solenoid valve undercurrent or the overcurrent of stopping in emergency to stop in emergency; to its circuit tripping protection when overcurrent of stopping in emergency in Electromagnetic Valve Circuit or/and switch failure short circuit; and it is prompted with corresponding indicator light; overcurrent protection stops until removing the Electromagnetic Valve Circuit power supply that stops in emergency, and switch short is protected and removed when being stopped in emergency.

Description

Diesel engine stops in emergency Electromagnetic Valve Circuit failover, warning circuit and its method

Technical field

The invention belongs to diesel engine safety protection technique fields, and in particular to a kind of diesel engine stops in emergency Electromagnetic Valve Circuit Failover, warning circuit and its implementation.

Background technology

At present：The emergency stopping system of diesel engine dies and oil-break two ways to stopping in emergency for diesel engine, dies Mode is the installation Electromagnetic Control valve at inlet and outlet mouth, can in case of emergency control valve be died；Oil-break mode be Install oil-break Electromagnetic Control valving on oil circuit additional, it can urgent oil-break when failure occurs.These Electromagnetic Control valves are i.e. logical The often signified solenoid valve that stops in emergency.It is designed when the solenoid valve that the solenoid valve that stops in emergency uses is normal-closed electromagnetic valve The Electromagnetic Valve Circuit that stops in emergency stops for degaussing (dead electricity)；When the solenoid valve that the solenoid valve that stops in emergency uses is normal-open electromagnetic valve When it is designed stop in emergency Electromagnetic Valve Circuit for magnetic (energization) stops.Magnetic (energization) parking is stopped and obtains in degaussing (dead electricity) In two methods, what prior art Literature was recorded：Diesel engine died with degaussing or the solenoid valve of oil-break set it is urgent There are many Electromagnetic Valve Circuit monitoring alarm method in vehicle-parking circuit, just do not sketch herein, only to the main problem of degaussing parking method It reiterates：It misses the bus and stops！, when parking power loss and/or the Electromagnetic Valve Circuit that stops in emergency disconnect, diesel engine mistakenly stop vehicle influences Diesel engine normal operation.And diesel engine with magnetic died or the solenoid valve of oil-break set the circuit that stops in emergency in solenoid valve Monitor loop alarm method is seldom.Diesel engine with magnetic died or the solenoid valve of oil-break set stop in emergency circuit work Process is：The solenoid valve that stops in emergency when diesel engine works normally is in dead electricity (loss of excitation) state, that is, the solenoid valve that stops in emergency loses During electricity condition its control die, oil-break valve is logical；When in urgent and significant trouble to the solenoid valve that stops in emergency Be powered (magnetic), closes the dying of its control, oil-break valve, realizes that diesel engine stops in emergency.However, for diesel engine with magnetic Died or the solenoid valve of oil-break set the circuit that stops in emergency in, when need to stop in emergency, the positive normal open of the solenoid valve that stops in emergency Electric diesel engine ability emergency stop, when line fracture, coil open circuit, coil short and power supply occurs in the electromagnetic valve coil that stops in emergency Electrical contact is bad when failures, need to stop in emergency, can not just be closed by the solenoid valve that stops in emergency its control die, oil-break Valve causes failure of stopping in emergency, so that the safety of diesel engine cannot ensure.Therefore for magnetic is died or oil-break The diesel engine that sets of solenoid valve stop in emergency circuit, to ensure the execution of diesel engine (diesel-driven generator) safe shutdown, be badly in need of It is detected and alarms to whether the corresponding Electromagnetic Valve Circuit that stops in emergency fails.Although being documented, such as number of patent application For：201510846141.X a kind of diesel engine stop in emergency Electromagnetic Valve Circuit failure alarm circuit and its alarm method, be equipped with The redundant configuration of stand-by power supply and solenoid valve (being similarly normal-open electromagnetic valve) solves：It is switched to during parking power loss spare Power supply is powered；Control recognizes Electromagnetic Valve Circuit disconnection of stopping in emergency when stopping in emergency, be switched to spare solenoid valves work, Pass through the dying of spare solenoid valve closing control, oil-break access.Perfect set is seemed actually to can not be achieved at all：Parking Stand-by power supply power supply is switched to during power loss；The Electromagnetic Valve Circuit that stops in emergency when control is stopped in emergency disconnects, and is switched to standby It is worked with solenoid valves, passes through the dying of spare solenoid valve closing control, oil-break access.On when stop power loss when not The reasons why stand-by power supply is powered, which may be switched to, is：Because specific control parking power supply and the current mode relay of stand-by power supply switching The rated current of device coil (the second current relay coil) be greater than or equal to parking power supply rated current, and with the electric current The specified electricity that can not possibly be greater than or equal to parking power supply using LED as the electric current that the first alarm lamp flows through of type relay coil concatenation Stream, otherwise will not with LED as alarm lamp；When stop power loss when, it is assumed that flow through and the current relay coil string What is connect is greater than or equal to the rated current of parking power supply using LED as the electric current that the first alarm lamp flows through, and the current relay is complete Into parking power supply and stand-by power supply switch operating, so the rated current of requirement alarm power supply is greater than or equal to parking again Otherwise the rated current of power supply cannot normally complete switching parking power supply and switch with stand-by power supply；Again because with using LED as second The rated current of the current relay coil (the 3rd current relay coil) of alarm lamp concatenation, which also requires that, to be more than or waits In the rated current of parking power supply, so in order to ensure alarm power supply works normally, the volume of alarm power supply is just necessarily required Constant current is greater than or equal to two times of rated current or more of parking power supply, and the specified of power supply of alarming actually in engineering design Current requirements can not possibly be relevant with the rated current for the power supply that stops, the electric current individually flowed through with the alarm lamp for power supply power supply of alarming It is required that it is also impossible to relevant with the rated current for the power supply that stops and is wanted with the current relay coil for power supply power supply of alarming The rated current asked be also impossible to stop power supply rated current it is relevant, equally unlikely require each alarm lamp stream The electric current crossed is greater than or equal to the rated current of the power supply for its power supply.On the solenoid valve that stops in emergency when control is stopped in emergency Circuit disconnects, it is impossible to which being switched to the reasons why spare solenoid valves work is：It is serially connected in the electricity for the Electromagnetic Valve Circuit that stops in emergency Identification is less than the situation that the Electromagnetic Valve Circuit that stops in emergency disconnects at all for flow pattern relay (the first current relay), because concatenation Current relay coil (the first current relay coil) of the Electromagnetic Valve Circuit that the stops in emergency invention setting requirements its Rated current is greater than or equal to the rated current of parking power supply, and feelings are disconnected less than emergency stop vehicle Electromagnetic Valve Circuit so as to identify at all Condition, concrete reason are：1. the situation of the short circuit for the Electromagnetic Valve Circuit that stops in emergency can only be recognized, because the solenoid valve that stops in emergency returns During the normal power-up work of road, the normal current of set generation can not possibly be greater than or equal to the rated current of parking power supply, such as Electric current caused by fruit is greater than or equal to the rated current of parking power supply, short circuit occurs in that Electromagnetic Valve Circuit that stops in emergency certainly Phenomenon；2. when the current relay for being serially connected in the Electromagnetic Valve Circuit that stops in emergency is not recognized more than or equal to parking power supply Rated current, the Electromagnetic Valve Circuit institute galvanization that can only illustrate to stop in emergency are in normal range (NR) or because loose contact resistance become larger electricity Stream is equal to zero less than normal value or direct breaking current；3. because it is serially connected in the current relay for the Electromagnetic Valve Circuit that stops in emergency The situation of the short circuit for the Electromagnetic Valve Circuit that stops in emergency can only be recognized, so as to occur stopping in emergency Electromagnetic Valve Circuit institute galvanization not Pipe is in when normally, being also less than normal (such as open circuit)：Assuming that the 3rd current relay line being serially connected on the second alarm lamp The rated current that institute's galvanization is greater than or equal to parking power supply is enclosed, then spare solenoid valve is similarly in obtain electric working condition；It is actual On be serially connected in the 3rd current relay coil institute galvanization on the second alarm lamp and can not possibly be greater than or equal to parking power supply Rated current, so when the Electromagnetic Valve Circuit institute's galvanization that stops in emergency is regardless of being in normally, is also less than normally (as breaking) Spare solenoid valve must not electricity；4. because when the current relay for being serially connected in the Electromagnetic Valve Circuit that stops in emergency can only recognize promptly The situation of the short circuit in electromagnetic valve for braking circuit, when the electric current for the Electromagnetic Valve Circuit that stops in emergency is greater than or equal to the specified of parking power supply During electric current, to stopping in emergency, Electromagnetic Valve Circuit is not cut off, and in the same old way in "on" position, and has been turned off the standby electricity that has no problem Magnet valve, therefore the Electromagnetic Valve Circuit short-circuit protection work that stops in emergency is not had, spare solenoid valve can not be switched to and stopped in emergency, Certainly overload protective function can not be played to parking power supply.Further reaffirm：Because of two current modes being serially connected on alarm lamp The rated current of relay coil is required to the rated current for being greater than or equal to parking power supply, hardly possible to the rated current of alarm power supply Two times of rated current more than or equal to parking power supply or more！, and each with LED as alarm lamp light when the electric current that flows through More than or equal to the rated current of parking power supply！, otherwise, the current relay being serially connected on alarm lamp is had no idea work. Certainly also number of patent application is：201510845456.2 a kind of diesel-driven generator stop in emergency Electromagnetic Valve Circuit Failure Alarm Circuit and its alarm method, the redundant configuration equipped with stand-by power supply and solenoid valve (being similarly normal-open electromagnetic valve) solve：Parking Stand-by power supply power supply is switched to during power loss；Control recognizes Electromagnetic Valve Circuit disconnection of stopping in emergency, switching when stopping in emergency It works to spare solenoid valves, passes through the dying of spare solenoid valve closing control, oil-break access.Emitting seemingly realizes above-mentioned work( Can, but to be except there are number of patent application：201510846141.X a kind of diesel engine stop in emergency Electromagnetic Valve Circuit failure report Alert circuit and its alarm method it is all there are the problem of and defect, also there are power supply used in alarm lamp produced by diesel-driven generator Electricity directly power, alarm lamp instruction be can't see at all after diesel-driven generator emergency stop vehicle, because controlling diesel-driven generator emergency stop When, user can not possibly stare at alarm lamp and see, it may be noted that once alarm lamp instruction state only after emergency stop, however diesel-driven generator is anxious Stop not generating electricity, how what is said or talked about has power supply output.And from number of patent application 201510846141.X and number of patent application 201510845456.2 specification described in advantageous effect content see：Diesel engine (diesel generator) stops in emergency electromagnetism Valve partial failure warning circuit can carry out self-shield in time in device fails, to ensure its solenoid valve that stops in emergency Circuit works normally, so as to fulfill the automatic emergency stop-working protection of diesel engine (diesel generator) in abnormal cases.Into one Step illustrates that the attached drawing of number of patent application 201510846141.X and number of patent application 201510845456.2 is diesel engine master control mould Block sends emergency shutdown instruction to diesel engine (diesel generator) the Electromagnetic Valve Circuit failure alarm circuit that stops in emergency, and control opens The diesel engine (diesel generator) after module switch is connected is closed to stop in emergency Electromagnetic Valve Circuit failure alarm circuit structural representation Figure, that is to say, that the attached drawing of number of patent application 201510846141.X and number of patent application 201510845456.2 is urgent Diesel engine (diesel generator) during parking stops in emergency Electromagnetic Valve Circuit failure alarm circuit structure diagram, so as to more into One step illustrates number of patent application 201510846141.X and the diesel engine (bavin described in number of patent application 201510845456.2 Diesel engine) use stop in emergency solenoid valve for magnetic electromagnetic valve for braking.

The content of the invention

The purpose of the present invention in order to solve defect existing in the prior art, for magnetic is died or the electromagnetism of oil-break Valve set diesel engine stop in emergency, provide a kind of diesel engine stop in emergency Electromagnetic Valve Circuit failover, warning circuit and its Method realizes that parking power-fail is switched to stand-by power supply power supply, when stop in emergency Electromagnetic Valve Circuit undercurrent, mistake when stopping in emergency Stream is switched to spare solenoid valve and stops in emergency, and when solenoid valve overcurrent of stopping in emergency or switch failure short circuit also carries out short-circuit guarantor Shield ensures to stop in emergency circuit normal work and prevents mistakenly stop；And indicator light is carried out to failure and is prompted respectively.

In order to realize above-mentioned purpose, the technical solution of realization of the invention is：

Diesel engine stops in emergency Electromagnetic Valve Circuit failover, warning circuit, including parking power supply DC1, stand-by power supply DC2, alarm power supply DC3, first voltage type relay, second voltage type relay, tertiary voltage type relay, the 4th voltage-type Relay, the first current relay, the second current relay, the solenoid valve HV1 that stops in emergency, spare solenoid valve HV2, first Malfunction indicator lamp MIL1, the second malfunction indicator lamp MIL2, the 3rd malfunction indicator lamp MIL3, the 4th malfunction indicator lamp MIL4, first Switch module K1, second switch module K2, switching tube 100, diode D1, diode D2, diode D3, diode D4, two poles Pipe D5, resistance R1, resistance R2, resistance R3, resistance R4, controllable silicon SCR；The first voltage type relay coil KV11 directly with Parking power supply DC1 simultaneously connects, and the anode of parking power supply DC1 is connected with the normally open end of first voltage type relay two-way contact KV12 It connects, the anode of stand-by power supply DC2 is connected with the normal-closed end of first voltage type relay two-way contact KV12, stand-by power supply DC2 Cathode with stop power supply DC1 cathode be connected；First current relay coil KI11 be sequentially connected in series the second current mode after Electric apparatus coil KI21, tertiary voltage type relay normally closed contact KV33, the coil for the solenoid valve HV1 that stops in emergency, first switch mould After the switch of block K1, the other end of the first current relay coil KI11 is with first voltage type relay two-way contact KV12's Common port is connected, and the other end of the switch of first switch module K1 is connected with the cathode for the power supply DC1 that stops, with the power supply that stops DC1 or stand-by power supply DC2 forms first parking circuit, and first parking circuit is the Electromagnetic Valve Circuit that stops in emergency；The After two voltage-type relay normally open contact KV22 are sequentially connected in series the switch of the coil of spare solenoid valve HV2, second switch module K2, The common port phase of the other end of second voltage type relay normally open contact KV22 and first voltage type relay two-way contact KV12 Connection, the other end of the switch of second switch module K2 are connected with the cathode for the power supply DC1 that stops, with the power supply DC1 or standby that stops Article 2 parking circuit is formed with power supply DC2, the Article 2 parking circuit is the spare Electromagnetic Valve Circuit that stops in emergency；Second electricity One end of flow pattern relay normally open contact KI22 is connected with one end of resistance R3, the other end of resistance R3 and tertiary voltage type after One end phase of electric apparatus coil KV31 and the common port that first voltage type relay two-way contact KV12 is accessed after connecing, tertiary voltage type The other end of relay coil KV31 is connected with the anode of controllable silicon SCR, the control pole of controllable silicon SCR and the second current mode after The other end of electric appliance normally opened contact KI22 and one end phase of resistance R4 simultaneously connect, the cathode of controllable silicon SCR and the other end of resistance R4 The cathode of access parking power supply DC1 mutually and after connecing, one end of the 4th voltage-type relay normally open contact KV42 and controllable silicon SCR Anode is connected, and the other end of the 4th voltage-type relay normally open contact KV42 is connected with the anode of diode D4, diode The cathode of D4 is connected with the anode of diode D5, and the cathode of diode D5 is connected with the cathode for the power supply DC1 that stops, with parking Power supply DC1 or stand-by power supply DC2 forms Article 3 parking circuit, and the Article 3 parking circuit is solenoid valve overcurrent of stopping in emergency And the switch failure fault control circuit of first switch module；One end and first of first current relay normally-closed contact KI12 The common port of voltage-type relay two-way contact KV12 is connected, and other end concatenation second voltage type relay coil KV21 is followed by Enter on the connecting line that spare solenoid valve HV2 coils are switched with second switch module K2, with the power supply DC1 or stand-by power supply DC2 that stops Article 4 parking circuit is formed, the Article 4 parking circuit is solenoid valve undercurrent switching control circuit of stopping in emergency；Described One end of four voltage-type relay coil KV41 is connected with the common port of first voltage type relay two-way contact KV12, another End is connected with the hot end of switching tube 100, the access of the cold end of switching tube 100 stop in emergency solenoid valve HV1 coils and On the connecting line of first switch module K1 switches, one end of resistance R1 is public with first voltage type relay two-way contact KV12's End is connected, and the other end and the anode of diode D1 and the anode of diode D3 are connected with each other, and the cathode access of diode D3 is standby With on the connecting line of solenoid valve HV2 coils and second switch module K2 switches, the cathode of diode D1 and the anode of diode D2 It is connected, the cathode of diode D2 and one end of the control terminal of switching tube 100 and resistance R2 are connected with each other, the other end of resistance R2 The cathode of access parking power supply DC1 forms Article 5 parking circuit, the Article 5 with parking power supply DC1 or stand-by power supply DC2 The switch failure short-circuit detecting circuit that parking circuit is first switch module K1；First voltage type relay normally closed contact KV13 goes here and there It connects with alarm power supply DC3 and connecing after the 3rd malfunction indicator lamp MIL3, forming parking power-fail with alarm power supply DC3 alarms back Road；The common port of tertiary voltage type relay two-way contact KV32 with alarm power supply DC3 cathode be connected, tertiary voltage type after The normally open end of electric appliance two-way contact KV32 is connected after concatenating the second malfunction indicator lamp MIL2 with the anode for the power supply DC3 that alarms, with Alarm power supply DC3 forms stop in emergency solenoid valve overcurrent and switch failure alarm circuit；Tertiary voltage type relay two-way contact After normal-closed end concatenation Fisrt fault indicator light MIL1, the second voltage type relay normally open contact KV23 of KV32 with power supply of alarming The anode of DC3 is connected, and the solenoid valve undercurrent alarm circuit that stops in emergency is formed with alarm power supply DC3；4th voltage-type relay Normally opened contact KV43 power supply DC3 and connects after concatenating the 4th malfunction indicator lamp MIL4 with alarm, and forming first with alarm power supply DC3 opens Close the switch failure short-circuit alarming circuit of module K1；The control terminal of the first switch module K1 and the control of second switch module K2 It is connected after end processed is connected with each other with the output of diesel engine main control module；The switching tube 100 is N-type metal-oxide-semiconductor；Or the switch Pipe 100 is NPN type triode.

The rated current of the first current relay coil KI11 of the above is equal to the solenoid valve HV1 coils that stop in emergency Extinction current；The rated current of the second current relay coil KI21 is equal to the solenoid valve HV1 coils that stop in emergency Maximum allowed current.

Above-described first voltage type relay two-way contact KV12, second voltage type relay normally open contact KV22, And the maximum currents that allow to flow through of tertiary voltage type relay normally closed contact KV33 are equal to or the volume more than parking power supply DC1 Constant current.

The above-described extinction current for stopping in emergency solenoid valve HV1 coils is to refer to ensure the electromagnetism that stops in emergency The minimum current of valve HV1 normal works.

The above-described maximum allowed current for stopping in emergency solenoid valve HV1 coils is to refer to ensure to burn out promptly The maximum operating currenbt of electromagnetic valve for braking HV1 coils.

When above-described switching tube 100 is N-type metal-oxide-semiconductor, the grid of N-type metal-oxide-semiconductor is the control terminal of switching tube 100, N-type The drain electrode of metal-oxide-semiconductor is the hot end of switching tube 100, and the source electrode of N-type metal-oxide-semiconductor is the cold end of switching tube 100；Described opens When to close pipe 100 be NPN type triode, the base stage of NPN type triode is the control terminal of switching tube 100, the current collection of NPN type triode The extremely hot end of switching tube 100, the cold end of the transmitting extremely switching tube 100 of NPN type triode.

Above-described diode D1, D2, D3, D4 and D5 are switching diode；The N-type metal-oxide-semiconductor increases for N-channel Strong type metal-oxide-semiconductor；The NPN type triode is NPN type switching transistor；The controllable silicon SCR is the pressure of itself after conducting It is reduced to the single-phase silicon-controlled of 1V or so.

In order to realize above-mentioned purpose, another technical solution of the invention is：

Diesel engine stops in emergency the implementation method of Electromagnetic Valve Circuit failover, warning circuit, comprises the following steps:

First, stop power supply DC1 and stand-by power supply DC2 handoff procedures

1) when stop power supply DC1 output for it is normal when, first voltage type relay coil KV11 obtain it is electric, first voltage type after The contact action of electric appliance：

(1) the common port of first voltage type relay two-way contact KV12 and normally open end are connected, and parking power supply DC1 is to parking Loop power supply,

(2) first voltage type relay normally closed contact KV13 is disconnected, and the 3rd malfunction indicator lamp MIL3 extinguishes；

2) when the power supply DC1 that stops fails, first voltage type relay coil KV11 dead electricity, first voltage type relay Contact reverts to static state：

(1) the common port of first voltage type relay two-way contact KV12 is connected with normal-closed end, is switched to stand-by power supply DC2 To parking loop power supply,

(2) first voltage type relay normally closed contact KV13 is connected, and the 3rd malfunction indicator lamp MIL3 is lighted, and user is prompted to stop Vehicle power supply DC1 fails；

2nd, the process for the solenoid valve HV1 and spare solenoid valve HV2 that stops in emergency is controlled

1) assert that second switch module K2 is intact, first switch module K1 quality is set to be unknown：

When diesel engine main control module sends emergency shut-down control device signal to first switch module K1 and second switch module K2 Whether period, the switch connection of second switch module K2, the switch of first switch module K1 are connected to be unknown,

When diesel engine main control module does not send emergency shut-down control device letter to first switch module K1 and second switch module K2 During number, the switch of second switch module K2 disconnects, and it is unknown whether the switch of first switch module K1 is broken as；

2) when second switch module K2 switch in an ON state, then switching tube 100 ends, the 4th voltage-type relay Contact be in static state, the switch failure fault control circuit of stop in emergency solenoid valve overcurrent and first switch module is not generated Control signal, and the 4th malfunction indicator lamp MIL4 is extinguishing；

3) when the switch of second switch module K2 is off, and the switch of first switch module K1 is in and disconnects, Then switching tube 100 ends, and the contact of the 4th voltage-type relay is in static state, solenoid valve overcurrent and first is not opened to stopping in emergency The switch failure fault control circuit for closing module generates control signal, and the 4th malfunction indicator lamp MIL4 is extinguishing；

4) when the switch of second switch module K2 is off, and the switch of first switch module K1 is in and connects, Then switching tube 100 turns on saturation, and the contact of the 4th voltage-type relay is in dynamic：

(1) when the 4th voltage-type relay normally open contact KV42 connections, to solenoid valve overcurrent and the first switch mould of stopping in emergency The switch failure fault control circuit of block generates control signal：

1. if controllable silicon SCR is in triggering and conducting, controllable silicon SCR is kept to turn on, i.e. tertiary voltage type relay coil KV31 is remained powered on,

2. if controllable silicon SCR is in cut-off, tertiary voltage type relay coil KV31 is led to by diode D4, D5 branch Electricity, and controllable silicon SCR is kept to end, until diode D4, D5 branch when the contact of the 4th voltage-type relay reverts to static state Stop being powered to tertiary voltage type relay coil KV31,

(2) the 4th voltage-type relay normally open contact KV43 is connected, and lights the 4th malfunction indicator lamp MIL4, and user is prompted to exist The switch failure short circuit of first switch module K1 during non-emergent parking；

5) when the second current relay detects the maximum allowed current more than the solenoid valve HV1 coils that stop in emergency, The contact of second current relay is in dynamic, i.e. the second current relay normally opened contact KI22 is connected, then by resistance R3 Trigger circuit is formed with R4, and trigger signal is generated to controllable silicon SCR：

1. if controllable silicon SCR is in the conduction state, controllable silicon SCR is kept to turn on,

2. if controllable silicon SCR is in cut-off state, controllable silicon SCR conducting is triggered；

6) when the second current relay does not detect the maximum allowed current more than the solenoid valve HV1 coils that stop in emergency When, the contact of the second current relay is in static state, i.e. the second current relay normally opened contact KI22 is disconnected, then by resistance R3 and R4 forms trigger circuit and does not generate trigger signal to controllable silicon SCR；

7) when controllable silicon SCR is on or/and the 4th voltage-type relay normally open contact KV42 is in and connects, the 3rd electricity Die mould relay coil KV31 is powered, i.e., the contact of tertiary voltage type relay is in dynamic：

(1) the tertiary voltage type relay normally closed contact KV33 being serially connected in the Electromagnetic Valve Circuit that stops in emergency is disconnected, to urgent Electromagnetic valve for braking circuit carries out physical break protection,

(2) the common port of tertiary voltage type relay two-way contact KV32 is connected with normally open end, lights the second malfunction indicator lamp MIL2, prompt user stop in emergency solenoid valve HV1 coil overcurrent or/and first switch module K1 switch failure short circuit：

1. when the second malfunction indicator lamp MIL2 diesel engine stop in emergency during light, illustrate the solenoid valve HV1 that stops in emergency Coil overcurrent,

2. when the 4th malfunction indicator lamp MIL4 is always maintained at OFF state, then, the second malfunction indicator lamp MIL2 lighted is said The coil overcurrent of the bright solenoid valve HV1 that stops in emergency,

3. when the second malfunction indicator lamp MIL2 is lit during the non-emergent parking of diesel engine by extinguishing, at this time with the 4th therefore Barrier indicator light MIL4 functions are identical, that is, illustrate the switch failure short circuit of first switch module K1,

4. when the second malfunction indicator lamp MIL2 is remain on during the non-emergent parking of diesel engine, and the 4th malfunction indicator lamp MIL4 is lit by extinguishing, then in the second malfunction indicator lamp MIL2 for lighting, the coil for the solenoid valve HV1 that both illustrates to stop in emergency Overcurrent adds the switch failure short circuit of bright first switch module K1；

8) when second switch module K2 switch in an ON state, the electric current of Electromagnetic Valve Circuit to be stopped in emergency is less than tight During the extinction current of anxious electromagnetic valve for braking HV1 coils, the contact of the first current relay is in static state, the first current mode Relay normally closed contact KI12 connect, second voltage type relay coil KV21 obtain it is electric, at the contact of second voltage type relay In dynamic：

(1) second voltage type relay normally open contact KV22 is connected, and spare solenoid valve HV2 obtains magnetic, and control diesel engine promptly stops Vehicle,

Second voltage type relay normally open contact KV23 connect, when the contact of tertiary voltage type relay be in static state, I.e. the common port of tertiary voltage type relay two-way contact KV32 is connected with normal-closed end, is lighted Fisrt fault indicator light MIL1, is carried Show user stop in emergency during tertiary voltage type relay normally closed contact KV33 be in connect in the case of stop in emergency solenoid valve The coil undercurrent of HV1,

(3) when second voltage type relay normally open contact KV23 is connected, when the contact of tertiary voltage type relay is in dynamic State, the i.e. common port of tertiary voltage type relay two-way contact KV32 are disconnected with normal-closed end, and Fisrt fault indicator light MIL1 extinguishes；

9) when flow through the solenoid valve HV1 coils that stop in emergency electric current be less than or equal to its maximum allowed current, more than or equal to it During extinction current, the solenoid valve HV1 that stops in emergency obtains magnetic, and control diesel engine stops in emergency.

Above-described diesel engine stops in emergency the implementation method of Electromagnetic Valve Circuit failover, warning circuit, further includes Following steps:

In stand-by power supply DC2 to during parking loop power supply, when power supply DC1 outputs of stopping revert to normal, first is electric Die mould relay coil KV11 obtains electric, the contact action of first voltage type relay：

(1) the common port of first voltage type relay two-way contact KV12 and normally open end are connected, recover parking power supply DC1 to Stop loop power supply；

After above-described controllable silicon SCR is powered, wait to remove parking power supply DC1 and stand-by power supply DC2, controllable silicon SCR is cut Only.

When the switch of above-described second switch module K2 is off：If at the switch of first switch module K1 In connection, then the conducting of switching tube 100 saturation, the contact of the 4th voltage-type relay are in dynamic, tertiary voltage type relay line KV31 is enclosed by being powered, the contact of tertiary voltage type relay is in dynamic, the be serially connected in the Electromagnetic Valve Circuit that stops in emergency Three voltage-type relay normally closed contact KV33 are disconnected, and to stopping in emergency, Electromagnetic Valve Circuit carries out physical break protection；If first opens The switch for closing module K1 is in disconnection, then stop in emergency Electromagnetic Valve Circuit no current；Therefore at the switch of second switch module K2 When off-state, there is no the electric currents for flowing through the solenoid valve HV1 coils that stop in emergency to be more than the solenoid valve HV1 coils that stop in emergency The situation of maximum allowed current.

Advantageous effect：

The diesel engine of the present invention stops in emergency Electromagnetic Valve Circuit failover, warning circuit and its method, main feature：

Diesel engine stop in emergency during and non-emergent parking during during the entire process of, once parking power-fail, Stand-by power supply work is switched to, and lights the 3rd malfunction indicator lamp MIL3, prompts user's parking power-fail；Power supply to be stopped is extensive It is multiple normal, automatically return to parking power supply power supply.

(2) overcurrent protection is not in before diesel engine stops in emergency, during diesel engine stops in emergency, if stopping in emergency electricity The coil undercurrent of magnet valve HV1 is stopped in emergency by spare solenoid valve HV2, and lights Fisrt fault indicator light MIL1, is prompted User is stopped in emergency the coil undercurrent of solenoid valve HV1.

(3) during diesel engine stops in emergency, if detecting the coil overcurrent for the solenoid valve HV1 that stops in emergency, cut-out promptly stops Vehicle Electromagnetic Valve Circuit, the Electromagnetic Valve Circuit that stops in emergency to cut-out carry out short-circuit protection, light the second malfunction indicator lamp MIL2, prompt User is stopped in emergency the coil overcurrent of solenoid valve HV1, and by means of the solenoid valve HV1 that stops in emergency coil undercurrent when be switched to it is standby Method of stopping in emergency is carried out with solenoid valve HV2, is stopped in emergency by spare solenoid valve HV2.

(4) the Electromagnetic Valve Circuit switch failure that stops in emergency during the non-emergent parking of diesel engine is short-circuit, and cut-off loop is protected It protects and prevents mistakenly stop vehicle, protect and removed when being stopped in emergency.

(5) when progress diesel engine stops in emergency, spare electromagnetism is switched in overcurrent protection before diesel engine stops in emergency Valve HV2 stops in emergency.

Description of the drawings

The diesel engine that Fig. 1 is the present invention stops in emergency the circuit structure diagram of Electromagnetic Valve Circuit failover, warning circuit；

In figure：KV11. first voltage type relay coil, KV12. first voltage type relay two-way contacts, KV13. One voltage-type relay normally closed contact, KV21. second voltage type relay coils, KV22, KV23. second voltage type relay are normal Open contact, KV31. tertiary voltage type relay coils, KV32. tertiary voltage type relay two-way contacts, KV33. tertiary voltages Type relay normally closed contact, KI11. the first current relay coils, KI12. the first current relay normally-closed contacts, KI21. the second current relay coil, KI22. the second current relay normally opened contacts, the 4th voltage-type relays of KV41. Coil, the 4th voltage-type relay normally open contact of KV42, KV43., 100. switching tubes, D1, D2, D3, D4, D5. diode, R1, R2, R3, R4. resistance, SCR. is silicon-controlled, DC1. parking power supplys, DC2. stand-by power supplies, DC3. alarm power supplys, and HV1. stops in emergency Solenoid valve, the spare solenoid valves of HV2., MIL1. Fisrt fault indicator lights, the second malfunction indicator lamp of MIL2., the 3rd failures of MIL3. refer to Show lamp, the 4th malfunction indicator lamp of MIL4., K1. first switch modules, K2. second switch modules.

Specific embodiment

Electromagnetic Valve Circuit failover, warning circuit as shown in Figure 1, diesel engine stops in emergency, including parking power supply DC1, Stand-by power supply DC2, alarm power supply DC3, first voltage type relay, second voltage type relay, tertiary voltage type relay, the Four voltage-type relays, the first current relay, the second current relay, the solenoid valve HV1 that stops in emergency, spare solenoid valve HV2, Fisrt fault indicator light MIL1, the second malfunction indicator lamp MIL2, the 3rd malfunction indicator lamp MIL3, the 4th malfunction indicator lamp MIL4, first switch module K1, second switch module K2, switching tube 100, diode D1, diode D2, diode D3, two poles Pipe D4, diode D5, resistance R1, resistance R2, resistance R3, resistance R4, controllable silicon SCR；The first voltage type relay coil KV11 directly power supply DC1 and connects with parking, and the anode of parking power supply DC1 is normal with first voltage type relay two-way contact KV12's Beginning is connected, and the anode of stand-by power supply DC2 is connected with the normal-closed end of first voltage type relay two-way contact KV12, spare The cathode of power supply DC2 is connected with the cathode for the power supply DC1 that stops；First current relay coil KI11 is sequentially connected in series the second electricity Flow pattern relay coil KI21, tertiary voltage type relay normally closed contact KV33, the coil for the solenoid valve HV1 that stops in emergency, first After the switch of switch module K1, the other end and the first voltage type relay two-way contact of the first current relay coil KI11 The common port of KV12 is connected, and the other end of the switch of first switch module K1 is connected with the cathode for the power supply DC1 that stops, with stopping Vehicle power supply DC1 or stand-by power supply DC2 forms first parking circuit, and first parking circuit is returned for the solenoid valve that stops in emergency Road；Second voltage type relay normally open contact KV22 is sequentially connected in series the coil of spare solenoid valve HV2, second switch module K2 is opened The other end of Guan Hou, second voltage type relay normally open contact KV22 are public with first voltage type relay two-way contact KV12's End is connected, and the other end of the switch of second switch module K2 is connected with the cathode for the power supply DC1 that stops, with the power supply DC1 that stops Or stand-by power supply DC2 forms Article 2 parking circuit, the Article 2 parking circuit is the spare Electromagnetic Valve Circuit that stops in emergency；The One end of two current relay normally opened contact KI22 is connected with one end of resistance R3, the other end and tertiary voltage of resistance R3 One end phase of type relay coil KV31 and the common port that first voltage type relay two-way contact KV12 is accessed after connecing, the 3rd electricity The other end of die mould relay coil KV31 is connected with the anode of controllable silicon SCR, the control pole of controllable silicon SCR and the second electric current The other end of type relay normally open contact KI22 and one end phase of resistance R4 simultaneously connect, and the cathode of controllable silicon SCR is another with resistance R4's One end phase and after connecing access parking power supply DC1 cathode, one end of the 4th voltage-type relay normally open contact KV42 with it is silicon-controlled The anode of SCR is connected, and the other end of the 4th voltage-type relay normally open contact KV42 is connected with the anode of diode D4, and two The cathode of pole pipe D4 is connected with the anode of diode D5, and the cathode of diode D5 is connected with the cathode for the power supply DC1 that stops, with The power supply DC1 or stand-by power supply DC2 that stops forms Article 3 parking circuit, and the Article 3 parking circuit is the solenoid valve that stops in emergency The switch failure fault control circuit of overcurrent and first switch module；One end of first current relay normally-closed contact KI12 with The common port of first voltage type relay two-way contact KV12 is connected, other end concatenation second voltage type relay coil KV21 It accesses afterwards on the connecting line that standby electricity magnet valve HV2 coils are switched with second switch module K2, with parking power supply DC1 or stand-by power supply DC2 forms Article 4 parking circuit, and the Article 4 parking circuit is solenoid valve undercurrent switching control circuit of stopping in emergency；It is described One end of 4th voltage-type relay coil KV41 is connected with the common port of first voltage type relay two-way contact KV12, separately One end is connected with the hot end of switching tube 100, and the cold end of switching tube 100 accesses the solenoid valve HV1 coils that stop in emergency On the connecting line switched with first switch module K1, one end of resistance R1 and the public affairs of first voltage type relay two-way contact KV12 End is connected altogether, and the other end and the anode of diode D1 and the anode of diode D3 are connected with each other, the cathode access of diode D3 On the connecting line that spare solenoid valve HV2 coils are switched with second switch module K2, the cathode of diode D1 and the sun of diode D2 Pole is connected, and the cathode of diode D2 and one end of the control terminal of switching tube 100 and resistance R2 are connected with each other, and resistance R2's is another Terminate the cathode into parking power supply DC1, with parking power supply DC1 or stand-by power supply DC2 form Article 5 parking circuit, the described 5th The switch failure short-circuit detecting circuit that item parking circuit is first switch module K1；First voltage type relay normally closed contact KV13 It concatenates with alarm power supply DC3 and connecing after the 3rd malfunction indicator lamp MIL3, forming parking power-fail with alarm power supply DC3 alarms back Road；The common port of tertiary voltage type relay two-way contact KV32 with alarm power supply DC3 cathode be connected, tertiary voltage type after The normally open end of electric appliance two-way contact KV32 is connected after concatenating the second malfunction indicator lamp MIL2 with the anode for the power supply DC3 that alarms, with Alarm power supply DC3 forms stop in emergency solenoid valve overcurrent and switch failure alarm circuit；Tertiary voltage type relay two-way contact After normal-closed end concatenation Fisrt fault indicator light MIL1, the second voltage type relay normally open contact KV23 of KV32 with power supply of alarming The anode of DC3 is connected, and the solenoid valve undercurrent alarm circuit that stops in emergency is formed with alarm power supply DC3；4th voltage-type relay Normally opened contact KV43 power supply DC3 and connects after concatenating the 4th malfunction indicator lamp MIL4 with alarm, and forming first with alarm power supply DC3 opens Close the switch failure short-circuit alarming circuit of module K1；The control terminal of the first switch module K1 and the control of second switch module K2 It is connected after end processed is connected with each other with the output of diesel engine main control module.

Controllable silicon SCR described above for stop in emergency Electromagnetic Valve Circuit overcurrent when be powered self-locking.When the second current mode after Electric appliance normally opened contact KI22 is connected, and parking power supply DC1 or stand-by power supply DC2 is carried by resistance R3, R4 to controllable silicon SCR control pole For triggering and conducting signal, triggering controllable silicon SCR conducting；When the second current relay normally opened contact KI22 is disconnected, stop power supply DC1 and stand-by power supply DC2 cannot provide triggering and conducting signal by resistance R3, R4 to controllable silicon SCR control pole, you can control silicon SCR control pole is without triggering Continuity signal；The present invention selects controllable silicon SCR to be single-phase silicon-controlled, and selected controllable silicon SCR is turning on The pressure drop of itself is about 1V or so afterwards, is ensured that during controllable silicon SCR turns on self-locking, when the 4th voltage-type relay is normal Contact KV42 connections are opened, the forward direction being attempted by between controllable silicon SCR anode and cathode is not turned on along diode D4, D5 of string, i.e., Make in tertiary voltage type relay coil KV31 by electric current fall a part from positive diode D4, D5 shunting along string, and Flow through controllable silicon SCR anode electric current be more than maintain electric current, in order to more reliably ensure controllable silicon SCR conducting self-locking during, and The forward direction being connected between controllable silicon SCR anode and cathode does not influence the conducting state that controllable silicon SCR is in along the diode of string, can be with It is attempted by after positive two diodes along string are changed to the suitable string of three diode forwards between controllable silicon SCR anode and cathode.By 24V is generally in parking power supply DC1 and stand-by power supply DC2 rated voltages, during controllable silicon SCR is ended, when the 4th voltage-type Relay normally open contact KV42 is connected, and tertiary voltage type relay coil KV31 is powered, and the electric current flowed through is through positive suitable string Diode D4, D5 are to the cathode of parking power supply DC1 or stand-by power supply DC2, and the decompression turned on diode D4, D5 will not shadow Tertiary voltage type relay power normal work is rung, because pressure drop is generally in coil rated voltage on voltage-type relay coil It can be worked normally between positive and negative 10%.

Above-described first switch module K1 and second switch module K2 when for serviceable condition when：Receiving diesel engine (machine) control signal that main control module was sent stop in emergency, the switch of the switch connection accordingly controlled, i.e. first switch module K1 It connects, the switch connection of second switch module K2；(machine) control of stopping in emergency that diesel engine main control module sends is not being received Signal, the switch accordingly controlled are off, i.e. the switch of first switch module K1 is off, second switch mould The switch of block K2 is off.

The above is in (machine) control signal of stopping in emergency for receiving diesel engine main control module and sending, that is to say, that this hair Bright diesel engine stop in emergency Electromagnetic Valve Circuit failover, warning circuit receive diesel engine main control module send it is urgent It stops (machine) control signal, stop in emergency Electromagnetic Valve Circuit failover, warning circuit of diesel engine is operated in control diesel oil at this time Machine stops in emergency.

The above is in (machine) control signal of stopping in emergency for not receiving diesel engine main control module and sending, that is to say, that this Stop in emergency Electromagnetic Valve Circuit failover, warning circuit of the diesel engine of invention is not receiving what diesel engine main control module was sent It stops in emergency (machine) control signal, stop in emergency Electromagnetic Valve Circuit failover, warning circuit of diesel engine is operated in non-control at this time Diesel engine processed stops in emergency.

But in real work：Since spare solenoid valve HV2 frequency of use is not high, so the switch of second switch module K2 It is less likely to be damaged；But for the relatively spare solenoid valve HV2 of the solenoid valve HV1 that stops in emergency：Frequency of use is high, such as when the electricity that stops in emergency Magnet valve HV1 causes its coil short to be just easy to first switch module K1 switching burning short circuit after being used for multiple times, then in non-controlling Diesel engine stops in emergency Electromagnetic Valve Circuit there is also during overcurrent or non-emergent parking during stopping in emergency, due to first switch The short circuit of module K1 switch failures, causes and stops in emergency by mistake.Therefore assert that the second switch module K2 is intact in the present invention State, first switch module K1 are unknown state.

Described diode D1, D2, D3, D4 and D5 are switching diode, and diode D1, D2, D4 and D5 select transwitch Diode, diode D3 select transwitch diode or germanium switching diode.

The switching tube 100 is N-type metal-oxide-semiconductor or NPN type triode, and the N-type metal-oxide-semiconductor used is the enhanced MOS of N-channel Pipe, the NPN type triode used is NPN type switching transistor；When switching tube 100 is N-type metal-oxide-semiconductor, the grid of N-type metal-oxide-semiconductor (G) be switching tube 100 control terminal, the drain electrode (D) of N-type metal-oxide-semiconductor is the hot end of switching tube 100, the source electrode of N-type metal-oxide-semiconductor (S) it is the cold end of switching tube 100, and disconnection is in the switch of second switch module K2, first switch module K1's opens It closes in when connecting (short circuit), gate-source voltage is adjusted by resistance R1 and resistance R2, switching tube 100 is made to turn on saturation；When opening When to close pipe 100 be NPN type triode, the base stage of NPN type triode is the control terminal of switching tube 100, the current collection of NPN type triode The extremely hot end of switching tube 100, the cold end of the transmitting extremely switching tube 100 of NPN type triode, and in second switch The switch of module K2, which is in, to be disconnected, and when the switch of first switch module K1 is in connection (short circuit), passes through resistance R1 and resistance R2 Base current is adjusted, switching tube 100 is made to turn on saturation.When the switch connection of second switch module K2, i.e. diode D3 conductings, The cathode current potential of diode D3 anodes to parking power supply DC1 are clamped at 0.7V or so, so as to anode and diode D3 anode phases The diode D1 connect, the current potential of anode to parking power supply DC1 cathode are equal to diode D3 anodes to parking power supply DC1 cathode quilts The current potential of the current potential of clamper, i.e. diode D1 anodes to parking power supply DC1 cathode is clamped at 0.7V or so, therefore forward direction is along string Diode D1 and diode D2 cut-offs, no conductivity control signal are sent to the control terminal of switching tube 100, at this time first switch module K1 Switch connection whether, switching tube 100 is turned off.When the switch of first switch module K1, which is in, to be disconnected, switching tube 100 uses N-type metal-oxide-semiconductor, no matter second switch module K2 switch connection whether, equal no-voltage between N-type metal-oxide-semiconductor grid source, N-type metal-oxide-semiconductor is cut Only；When first switch module K1 switch be in disconnect when, switching tube 100 use NPN type triode, no matter second switch module Whether the switch connection of K2, the equal no current of base stage of NPN type triode, NPN type triode cut-off.

For switching tube 100 for for NPN type triode：It is disconnected when the switch of second switch module K2 is in, i.e. two poles When pipe D3 is in cut-off, if the switch of first switch module K1, which is in, connects (short circuit), stop power supply DC1 or stand-by power supply DC2 is diverted to NPN type triode base current through resistance R1, diode D1, diode D2, and it is full to meet NPN type triode conducting With require, NPN type triode conducting saturation, otherwise, parking power supply DC1 or stand-by power supply DC2 through resistance R1, diode D1, two It is zero that pole pipe D2, which is diverted to NPN type triode base current, NPN type triode cut-off；When the switch of second switch module K2 connects Logical, i.e. when diode D3 is turned on, the current potential of diode D3 anodes to parking power supply DC1 are clamped at 0.7V or so, so as to anode The diode D1 to connect with diode D3 anodes, the current potential of anode to parking power supply DC1 cathode are arrived equal to diode D3 anodes The current potential of the current potential that parking power supply DC1 is clamped, i.e. diode D1 anodes to parking power supply DC1 cathode is clamped at a 0.7V left sides The right side, therefore positive diode D1 and diode D2 along string is obstructed, no current send the base stage of NPN type triode, at this time no matter first Whether the switch connection of switch module K1, NPN type triode is turned off.

For switching tube 100 for for N-type metal-oxide-semiconductor：It is disconnected when the switch of second switch module K2 is in, i.e. diode D3 During in cut-off, if the switch of first switch module K1, which is in, connects (short circuit), stop power supply DC1 or stand-by power supply DC2 warps Resistance R1, diode D1, diode D2, resistance R2 are divided to the gate-source voltage of N-type metal-oxide-semiconductor, and it is full to meet the conducting of N-type metal-oxide-semiconductor With require, N-type metal-oxide-semiconductor conducting saturation, otherwise, parking power supply DC1 or stand-by power supply DC2 through resistance R1, diode D1, diode The gate-source voltage that D2, resistance R2 are divided to N-type metal-oxide-semiconductor is zero, the cut-off of N-type metal-oxide-semiconductor；When the switch of second switch module K2 connects Logical, i.e. when diode D3 is turned on, the current potential of diode D3 anodes to parking power supply DC1 are clamped at 0.7V or so, so as to anode The diode D1 to connect with diode D3 anodes, the current potential of anode to parking power supply DC1 cathode are arrived equal to diode D3 anodes The current potential of the current potential that parking power supply DC1 is clamped, i.e. diode D1 anodes to parking power supply DC1 cathode is clamped at a 0.7V left sides The right side, therefore positive diode D1 and diode D2 along string is obstructed, no-voltage adds to the grid of N-type metal-oxide-semiconductor, no matter first opens at this time Whether closing the switch connection of module K1, N-type metal-oxide-semiconductor is turned off.

When switching tube 100 is in cut-off, then the 4th voltage-type relay coil KV41 no currents by, the 4th voltage-type after Electric appliance does not work, and the contact of the 4th voltage-type relay is in static state.

When switching tube 100 is on saturation, then the 4th voltage-type relay coil KV41 has electric current to pass through the 4th voltage Type relay works, and the contact of the 4th voltage-type relay is in dynamic.

When assert that second switch module K2 is serviceable condition, in second switch module K2 in during switch disconnection：It opens It closes pipe 100 to end, i.e., the contact of the 4th voltage-type relay is in static state, then illustrates that the switch of first switch module K1 is equally located It is intact in being broken as；Switching tube 100 turns on saturation, i.e. the contact of the 4th voltage-type relay is in dynamic, then assert that first opens The switch for closing module K1 is in connection (short circuit) as damage.

When assert second switch module K2 be serviceable condition, during the switch connection of second switch module K2：No matter Whether the switch of one switch module K1 is connected, and switching tube 100 is turned off, and the contact of the 4th voltage-type relay is in static state, I.e. during the switch connection of second switch module K2, then switch failure short-circuit detecting circuit does not open first switch module K1 Whether pass damages detection identification.

Above-described solenoid valve undercurrent switching control circuit of stopping in emergency is used for：It is detected during stopping in emergency urgent During the coil undercurrent of electromagnetic valve for braking HV1, it is switched to spare solenoid valve HV2 and carries out emergency shut-down control device；Stop in emergency solenoid valve Undercurrent switching control circuit and by means of give detect the coil overcurrent for the solenoid valve HV1 that stops in emergency during stop in emergency when, switching Emergency shut-down control device is carried out to spare solenoid valve HV2.

The switch failure fault control circuit of above-described stop in emergency solenoid valve overcurrent and first switch module：For Stop in emergency during stopping in emergency solenoid valve HV1 coil overcurrent and non-emergent parking during first switch module switch failure When short-circuit, to stopping in emergency, Electromagnetic Valve Circuit carries out physical break protection, and to the physics for Electromagnetic Valve Circuit overcurrent of stopping in emergency Tripping protection remain to wait remove parking power supply DC1 and stand-by power supply DC2 when terminate (releasing), otherwise, to the electromagnetism that stops in emergency During the physical break protection of valve circuit overcurrent is always held at diesel engine later stop in emergency period and non-emergent parking, i.e., It is always held in the later entire implementation procedure of diesel engine；And the physical break of the switch failure short circuit to first switch module (releasing) is terminated when protecting pending stop in emergency.The coil mistake for the solenoid valve HV1 that stops in emergency is detected during stopping in emergency The switch failure fault control circuit of stream, then solenoid valve overcurrent of stopping in emergency and first switch module：To the solenoid valve that stops in emergency Circuit carries out physical break protection, and is always held in the later entire implementation procedure of diesel engine, waits to remove parking power supply DC1 (releasing) is terminated with during stand-by power supply DC2；The switch failure short circuit of first switch module is detected during non-emergent parking, then The switch failure fault control circuit of solenoid valve overcurrent of stopping in emergency and first switch module：To stop in emergency Electromagnetic Valve Circuit into Row physical break/holding tripping protection, and until terminate (releasing) when being stopped in emergency.It is detected during non-emergent parking The switch failure short circuit of first switch module, to stopping in emergency, Electromagnetic Valve Circuit carries out physical break protection, also solves non-tight The switch failure short circuit of first switch module K1 causes the problem of emergency stop by mistake during emergency stop vehicle；To during non-emergent parking when first The switch failure short circuit of switch module, the protection of physical break/holding cut-out is carried out to the Electromagnetic Valve Circuit that stops in emergency until into (releasing) is terminated when row stops in emergency, is conducive to mainly stop in emergency using the solenoid valve HV1 that stops in emergency.When stopping in emergency Electromagnetic Valve Circuit is in the switch failure fault control circuit of stop in emergency solenoid valve overcurrent and first switch module to it because of mistake The physical break guard mode carried out is flowed, then when stopping in emergency to diesel engine, is directly switched by the solenoid valve undercurrent that stops in emergency Control loop, control are switched to spare solenoid valve HV2 and stop in emergency.

Fisrt fault indicator light MIL1 described above be used to stopping in emergency during stopping in emergency solenoid valve HV1 coil the Undercurrent prompting under the three non-disconnections of voltage-type relay normally closed contact KV33, when Fisrt fault indicator light MIL1 is lighted, The Electromagnetic Valve Circuit that illustrates to stop in emergency be likely to contact poor electrical resistance become larger or stop in emergency solenoid valve HV1 coil open circuit or should Circuit is breaking elsewhere, if the switch failure of first switch module is opened a way, also includes institute's power supply source certainly it is possible that damage is led It causes for stream deficiency.

Above-described second malfunction indicator lamp MIL2 is that the contact of tertiary voltage type relay is in operating state time point Bright, the second malfunction indicator lamp MIL2 is lighted, and illustrates stop in emergency the coil overcurrent of solenoid valve HV1 or/and first switch module K1 Switch failure short circuit：

1. when the second malfunction indicator lamp (MIL2) diesel engine stop in emergency during light, illustrate the solenoid valve that stops in emergency (HV1) coil overcurrent；

2. when the 4th malfunction indicator lamp (MIL4) is always maintained at OFF state, then, and the second malfunction indicator lamp lighted (MIL2), illustrate to stop in emergency the coil overcurrent of solenoid valve (HV1)；

3. when the second malfunction indicator lamp (MIL2) is lit during the non-emergent parking of diesel engine by extinguishing, at this time with the 4th Malfunction indicator lamp (MIL4) function is identical, that is, illustrates the switch failure short circuit of first switch module (K1)；

4. when the second malfunction indicator lamp (MIL2) is remain on during the non-emergent parking of diesel engine, and the 4th indicating fault Lamp (MIL4) is lit by extinguishing, then in the second malfunction indicator lamp (MIL2) lighted, both illustrates the solenoid valve that stops in emergency (HV1) coil overcurrent adds the switch failure short circuit of bright first switch module (K1).

Above-described 4th malfunction indicator lamp MIL4 stops for the switch of first switch module K1 diesel engine is non-emergent Short circuit of failing during vehicle is prompted, if diesel engine, during non-emergent parking, the switch failure of first switch module K1 is short-circuit, then point Otherwise bright 4th malfunction indicator lamp MIL4 keeps extinguishing.The present invention due to assert second switch module K2 be serviceable condition, therefore During diesel engine stops in emergency, the 4th malfunction indicator lamp MIL4 is in OFF state.

The 3rd malfunction indicator lamp MIL3 of the above is prompted when failing for the power supply DC1 that stops, when the 3rd event of parking power supply When barrier indicator light MIL3 is lighted, the power supply DC1 output voltages that illustrate to stop are less than first voltage type relay coil KV11 maintenance electricity It presses or equal to zero, here when parking power supply DC1 output voltages less than first voltage type relay coil KV11 maintenance voltages or wait Parking power supply DC1 failures (or halting vehicle power supply DC1 dead electricity or decompression) are regarded as when zero.

The rated voltage of first voltage type relay coil KV11 described above is more than the rated voltage of parking power supply DC1, Be conducive to the rated voltage for making first voltage type relay coil KV11 maintenance voltages close to parking power supply DC1, but ensure again The contact of first voltage type relay normally becomes dynamic from static, and the present invention selects first voltage type relay coil KV11's Rated voltage is equal to the 106% of the rated voltage of parking power supply DC1.

Above-described first voltage type relay two-way contact KV12, second voltage type relay normally open contact KV22, And the maximum current that tertiary voltage type relay normally closed contact KV33 is allowed to flow through is all higher than or equal to the volume for stopping power supply DC1 Constant current.

Above-described first current relay coil KI11：When the electric current flowed through is more than or equal to its rated current the The contact action of one current relay, i.e. normally opened contact are connected, and normally-closed contact disconnects；When the electric current flowed through is less than its specified electricity The contact of the first current relay is in static state during stream, i.e. normally opened contact disconnects, and normally-closed contact is connected.

Above-described second current relay coil KI21：When the electric current flowed through be more than its rated current when second electricity The contact action of flow pattern relay, i.e. normally opened contact are connected, and normally-closed contact disconnects；When the electric current flowed through is less than or equal to its specified electricity The contact of the second current relay is in static state during stream, i.e. normally opened contact disconnects, and normally-closed contact is connected.

The rated current of the first current relay coil KI11 of the above is set equal to the solenoid valve HV1 lines that stop in emergency The extinction current of circle；The rated current of the second current relay coil KI21 is set equal to the solenoid valve that stops in emergency The maximum allowed current of HV1 coils.

When stopping in emergency when the electric current that solenoid valve HV1 coils flow through of stopping in emergency in its extinction current to maximum allowable When between electric current, the present invention assert that the coil for the solenoid valve HV1 that stops in emergency is in normal operating conditions, and otherwise, identification promptly stops Vehicle Electromagnetic Valve Circuit breaks down.

The present invention assert that the output for the power supply DC1 that stops during the contact actuation (action) that can guarantee first voltage type relay is Normal output.

Above-described diesel engine stop in emergency Electromagnetic Valve Circuit failover, warning circuit parking power supply DC1 with it is standby It is as follows with power supply DC2 handoff procedures：

(1) the common port of first voltage type relay two-way contact KV12 and normally open end are connected, and parking power supply DC1 is to parking Loop power supply；

(1) the common port of first voltage type relay two-way contact KV12 is connected with normal-closed end, is switched to stand-by power supply (DC2) to parking loop power supply；

3) stand-by power supply DC2 to parking loop power supply during, wait stop power supply DC1 output revert to normal when, first Voltage-type relay coil KV11 obtains electric, the contact action of first voltage type relay：

(2) first voltage type relay normally closed contact KV13 is disconnected, and the 3rd malfunction indicator lamp MIL3 lighted extinguishes.

Claims

Electromagnetic Valve Circuit failover, warning circuit 1. diesel engine stops in emergency, including parking power supply (DC1), stand-by power supply (DC2), alarm power supply (DC3), first voltage type relay, second voltage type relay, tertiary voltage type relay, the 4th electricity Die mould relay, the first current relay, the second current relay, the solenoid valve that stops in emergency (HV1), spare solenoid valve (HV2), Fisrt fault indicator light (MIL1), the second malfunction indicator lamp (MIL2), the 3rd malfunction indicator lamp (MIL3), the 4th failure Indicator light (MIL4), first switch module (K1), second switch module (K2), switching tube (100), diode D1, diode D2, Diode D3, diode D4, diode D5, resistance R1, resistance R2, resistance R3, resistance R4, silicon-controlled (SCR)；Its feature exists In, the first voltage type relay coil (KV11) directly with parking power supply (DC1) and connecing, the anode of parking power supply (DC1) It is connected with the normally open end of first voltage type relay two-way contact (KV12), the anode and first voltage of stand-by power supply (DC2) The normal-closed end of type relay two-way contact (KV12) is connected, the cathode of the cathode and parking power supply (DC1) of stand-by power supply (DC2) It is connected；First current relay coil (KI11) is sequentially connected in series the second current relay coil (KI21), tertiary voltage Type relay normally closed contact (KV33), the coil of the solenoid valve that stops in emergency (HV1), first switch module (K1) switch after, The other end of one current relay coil (KI11) is connected with the common port of first voltage type relay two-way contact (KV12) It connects, the other end of the switch of first switch module (K1) is connected with the cathode of parking power supply (DC1), with parking power supply (DC1) Or stand-by power supply (DC2) forms first parking circuit, first parking circuit is the Electromagnetic Valve Circuit that stops in emergency；Second Voltage-type relay normally open contact (KV22) is sequentially connected in series the coil of spare solenoid valve (HV2), second switch module (K2) is opened Guan Hou, the other end and the first voltage type relay two-way contact (KV12) of second voltage type relay normally open contact (KV22) Common port is connected, and the other end of the switch of second switch module (K2) is connected with the cathode of parking power supply (DC1), with parking Power supply (DC1) or stand-by power supply (DC2) form Article 2 parking circuit, and the Article 2 parking circuit is standby electricity of stopping in emergency Magnet valve circuit；One end of second current relay normally opened contact (KI22) is connected with one end of resistance R3, and resistance R3's is another One end phase of one end and tertiary voltage type relay coil (KV31) simultaneously accesses first voltage type relay two-way contact after connecing (KV12) common port, the other end of tertiary voltage type relay coil (KV31) are connected with the anode of silicon-controlled (SCR), can Control control pole and the second current relay normally opened contact (KI22) of silicon (SCR) the other end and resistance R4 one end phase simultaneously Connect, the cathode of silicon-controlled (SCR) and the other end phase of resistance R4 and after connecing access parking power supply (DC1) cathode, the 4th voltage One end of type relay normally open contact (KV42) is connected with the anode of silicon-controlled (SCR), and the 4th voltage-type relay normally open touches The other end of point (KV42) is connected with the anode of diode D4, and the cathode of diode D4 is connected with the anode of diode D5, The cathode of diode D5 is connected with the cathode of parking power supply (DC1), is formed with parking power supply (DC1) or stand-by power supply (DC2) Article 3 is stopped circuit, and Article 3 parking circuit is the switch failure of solenoid valve overcurrent and first switch module of stopping in emergency Fault control circuit；One end of first current relay normally-closed contact (KI12) and first voltage type relay two-way contact (KV12) common port is connected, and other end concatenation second voltage type relay coil (KV21) accesses standby electricity magnet valve afterwards (HV2) coil with parking power supply (DC1) or stand-by power supply (DC2) on the connecting line of second switch module (K2) switch, forming Article 4 parking circuit, the Article 4 parking circuit is solenoid valve undercurrent switching control circuit of stopping in emergency；4th electricity One end of die mould relay coil (KV41) is connected with the common port of first voltage type relay two-way contact (KV12), another End is connected with the hot end of switching tube (100), and the cold end of switching tube (100) accesses the solenoid valve (HV1) that stops in emergency On the connecting line that coil is switched with first switch module (K1), one end and the first voltage type relay two-way contact of resistance R1 (KV12) common port is connected, and the other end and the anode of diode D1 and the anode of diode D3 are connected with each other, diode D3 Cathode access spare solenoid valve (HV2) coil on the connecting line of second switch module (K2) switch, the cathode of diode D1 It is connected with the anode of diode D2, the cathode and the control terminal of switching tube (100) and one end of resistance R2 of diode D2 is mutual And connect, the cathode of the other end access parking power supply (DC1) of resistance R2 is formed with parking power supply (DC1) or stand-by power supply (DC2) Article 5 parking circuit, the Article 5 parking circuit are the switch failure short-circuit detecting circuit of first switch module (K1)；The One voltage-type relay normally closed contact (KV13) concatenates the 3rd malfunction indicator lamp (MIL3) and (DC3) and is connect with alarm power supply afterwards, with Power supply (DC3) of alarming forms parking power-fail alarm circuit；The common port of tertiary voltage type relay two-way contact (KV32) It is connected with the cathode of alarm power supply (DC3), the second event of normally open end concatenation of tertiary voltage type relay two-way contact (KV32) Anode of the barrier indicator light (MIL2) afterwards with alarm power supply (DC3) is connected, and the solenoid valve that stops in emergency is formed with alarm power supply (DC3) Overcurrent and switch failure alarm circuit；The normal-closed end concatenation Fisrt fault instruction of tertiary voltage type relay two-way contact (KV32) The anode of lamp (MIL1), second voltage type relay normally open contact (KV23) afterwards with alarm power supply (DC3) is connected, with alarm electricity Source (DC3) forms the solenoid valve undercurrent alarm circuit that stops in emergency；4th voltage-type relay normally open contact (KV43) concatenation the 4th Malfunction indicator lamp (MIL4) (DC3) and connects afterwards with alarm power supply, and opening for first switch module (K1) is formed with alarm power supply (DC3) Close failure short-circuit alarming circuit；The control terminal of the first switch module (K1) and the control terminal of second switch module (K2) are mutual And the output connect afterwards with diesel engine main control module is connected；The switching tube (100) is N-type metal-oxide-semiconductor；Or the switching tube (100) it is NPN type triode.
Electromagnetic Valve Circuit failover, warning circuit 2. a kind of diesel engine according to claim 1 stops in emergency, feature It is, the rated current of the first current relay coil (KI11), which is equal to, stops in emergency solenoid valve (HV1) coil most Small maintenance electric current；The rated current of the second current relay coil (KI21) is equal to solenoid valve (HV1) line that stops in emergency The maximum allowed current of circle.
Electromagnetic Valve Circuit failover, warning circuit 3. a kind of diesel engine according to claim 1 stops in emergency, feature Be, the first voltage type relay two-way contact (KV12), second voltage type relay normally open contact (KV22) and The maximum current that tertiary voltage type relay normally closed contact (KV33) allows to flow through is equal to or the volume more than parking power supply (DC1) Constant current.
Electromagnetic Valve Circuit failover, warning circuit 4. a kind of diesel engine according to claim 2 stops in emergency, feature It is, the extinction current of described solenoid valve that stops in emergency (HV1) coil is to refer to ensure the solenoid valve that stops in emergency (HV1) minimum current of normal work.
Electromagnetic Valve Circuit failover, warning circuit 5. a kind of diesel engine according to claim 2 stops in emergency, feature It is, the maximum allowed current of described solenoid valve that stops in emergency (HV1) coil is to refer to ensure to burn out to stop in emergency The maximum operating currenbt of solenoid valve (HV1) coil.
Electromagnetic Valve Circuit failover, warning circuit 6. a kind of diesel engine according to claim 1 stops in emergency, feature It is, when the switching tube (100) is N-type metal-oxide-semiconductor, the grid of N-type metal-oxide-semiconductor is the control terminal of switching tube (100), N-type MOS The drain electrode of pipe is the hot end of switching tube (100), and the source electrode of N-type metal-oxide-semiconductor is the cold end of switching tube (100)；Described When switching tube (100) is NPN type triode, the base stage of NPN type triode is the control terminal of switching tube (100), NPN type triode Current collection extremely switching tube (100) hot end, the cold end of the transmitting extremely switching tube (100) of NPN type triode.
Electromagnetic Valve Circuit failover, warning circuit 7. a kind of diesel engine according to claim 1 stops in emergency, feature It is, described diode D1, D2, D3, D4 and D5 are switching diode；The N-type metal-oxide-semiconductor is the enhanced MOS of N-channel Pipe；The NPN type triode is NPN type switching transistor；The controllable silicon SCR is that the pressure drop of itself is a 1V left sides after turning on Right is single-phase silicon-controlled.
Electromagnetic Valve Circuit failover, alarm electricity 8. a kind of diesel engine according to claims 1 to 3 any bar stops in emergency The implementation method on road, which is characterized in that comprise the following steps:

First, stop power supply (DC1) and stand-by power supply (DC2) handoff procedure

1) when stop power supply (DC1) export for it is normal when, first voltage type relay coil (KV11) it is electric, first voltage type after The contact action of electric appliance：

(1) the common port of first voltage type relay two-way contact (KV12) and normally open end are connected, and parking power supply (DC1) is to parking Loop power supply,

(2) first voltage type relay normally closed contact (KV13) disconnects, and the 3rd malfunction indicator lamp (MIL3) is extinguished；

2) when the power supply (DC1) that stops fails, first voltage type relay coil (KV11) dead electricity, first voltage type relay Contact reverts to static state：

(1) the common port of first voltage type relay two-way contact (KV12) is connected with normal-closed end, is switched to stand-by power supply (DC2) To parking loop power supply,

(2) first voltage type relay normally closed contact (KV13) is connected, and the 3rd malfunction indicator lamp (MIL3) is lighted, and user is prompted to stop Vehicle power supply (DC1) fails；

2nd, the process of stop in emergency solenoid valve (HV1) and spare solenoid valve (HV2) is controlled

1) assert that second switch module (K2) is intact, first switch module (K1) quality is set to be unknown：

When diesel engine main control module sends emergency shut-down control device signal to first switch module (K1) and second switch module (K2) Whether period, the switch connection of second switch module (K2), the switch of first switch module (K1) are connected to be unknown,

When diesel engine main control module does not send emergency shut-down control device letter to first switch module (K1) and second switch module (K2) During number, the switch of second switch module (K2) disconnects, and it is unknown whether the switch of first switch module (K1) is broken as；

2) when second switch module (K2) switch in an ON state, then switching tube (100) end, the 4th voltage-type relay Contact be in static state, the switch failure fault control circuit of stop in emergency solenoid valve overcurrent and first switch module is not generated Control signal, and the 4th malfunction indicator lamp (MIL4) is extinguishing；

3) when the switch of second switch module (K2) is off, and the switch of first switch module (K1) is in and disconnects, Then switching tube (100) ends, and the contact of the 4th voltage-type relay is in static state, not to solenoid valve overcurrent and first of stopping in emergency The switch failure fault control circuit of switch module generates control signal, and the 4th malfunction indicator lamp (MIL4) is extinguishing；

4) when the switch of second switch module (K2) is off, and the switch of first switch module (K1) is in and connects, Then switching tube (100) conducting saturation, the contact of the 4th voltage-type relay are in dynamic：

(1) when the connection of the 4th voltage-type relay normally open contact (KV42), to solenoid valve overcurrent and the first switch module of stopping in emergency Switch failure fault control circuit generate control signal：

1. silicon-controlled if (SCR) is in triggering and conducting, silicon-controlled (SCR) is kept to turn on, i.e. tertiary voltage type relay coil (KV31) remain powered on,

2. silicon-controlled if (SCR) is in cut-off, tertiary voltage type relay coil (KV31) is led to by diode D4, D5 branch Electricity, and silicon-controlled (SCR) is kept to end, until diode D4, D5 branch when the contact of the 4th voltage-type relay reverts to static state Road stops being powered to tertiary voltage type relay coil (KV31),

(2) the 4th voltage-type relay normally open contact (KV43) is connected, and lights the 4th malfunction indicator lamp (MIL4), and user is prompted to exist The switch failure short circuit of first switch module (K1) during non-emergent parking；

5) when the second current relay detects the maximum allowed current more than solenoid valve (HV1) coil that stops in emergency, the The contact of two current relay is in dynamic, i.e. the second current relay normally opened contact (KI22) is connected, then by resistance R3 Trigger circuit is formed with R4, and trigger signal is generated to silicon-controlled (SCR)：

1. silicon-controlled if (SCR) is in the conduction state, silicon-controlled (SCR) is kept to turn on,

2. silicon-controlled if (SCR) is in cut-off state, silicon-controlled (SCR) conducting is triggered；

6) when the second current relay does not detect the maximum allowed current more than solenoid valve (HV1) coil that stops in emergency When, the contact of the second current relay is in static state, i.e. the second current relay normally opened contact (KI22) disconnects, then by electricity It hinders R3 and R4 and forms trigger circuit not to silicon-controlled (SCR) generation trigger signal；

7) when silicon-controlled (SCR) is on or/and the 4th voltage-type relay normally open contact (KV42) is in and connects, the 3rd electricity Die mould relay coil (KV31) is powered, i.e., the contact of tertiary voltage type relay is in dynamic：

(1) the tertiary voltage type relay normally closed contact (KV33) being serially connected in the Electromagnetic Valve Circuit that stops in emergency disconnects, to promptly stopping Vehicle Electromagnetic Valve Circuit carries out physical break protection,

(2) the common port of tertiary voltage type relay two-way contact (KV32) is connected with normally open end, lights the second malfunction indicator lamp (MIL2), prompting user stop in emergency solenoid valve (HV1) coil overcurrent or/and first switch module (K1) switch failure it is short Road：

1. when the second malfunction indicator lamp (MIL2) diesel engine stop in emergency during light, illustrate the solenoid valve (HV1) that stops in emergency Coil overcurrent,

2. when the 4th malfunction indicator lamp (MIL4) is always maintained at OFF state, then, the second malfunction indicator lamp (MIL2) lighted is said The coil overcurrent of the bright solenoid valve that stops in emergency (HV1),

3. when the second malfunction indicator lamp (MIL2) is lit during the non-emergent parking of diesel engine by extinguishing, at this time with the 4th failure Indicator light (MIL4) function is identical, that is, illustrates the switch failure short circuit of first switch module (K1),

4. when the second malfunction indicator lamp (MIL2) is remain on during the non-emergent parking of diesel engine, and the 4th malfunction indicator lamp (MIL4) it is lit by extinguishing, then in the second malfunction indicator lamp (MIL2) lighted, both illustrates the solenoid valve (HV1) that stops in emergency Coil overcurrent, add bright first switch module (K1) switch failure short circuit；

8) when second switch module (K2) switch in an ON state, the electric current of Electromagnetic Valve Circuit to be stopped in emergency is less than urgent During the extinction current of electromagnetic valve for braking (HV1) coil, the contact of the first current relay is in static state, the first current mode Relay normally closed contact (KI12) is connected, and second voltage type relay coil (KV21) must be electric, and second voltage type relay touches Point is in dynamic：

(1) second voltage type relay normally open contact (KV22) is connected, and spare solenoid valve (HV2) obtains magnetic, and control diesel engine promptly stops Vehicle,

Second voltage type relay normally open contact (KV23) connect, when the contact of tertiary voltage type relay be in static state, i.e., The common port of tertiary voltage type relay two-way contact (KV32) is connected with normal-closed end, lights Fisrt fault indicator light (MIL1), Tertiary voltage type relay normally closed contact (KV33) is in during prompting user is stopped in emergency connect in the case of stop in emergency electricity The coil undercurrent of magnet valve (HV1),

(3) when second voltage type relay normally open contact (KV23) is connected, when the contact of tertiary voltage type relay is in dynamic State, the i.e. common port of tertiary voltage type relay two-way contact (KV32) are disconnected with normal-closed end, Fisrt fault indicator light (MIL1) Extinguish；

9) when flow through the solenoid valve that stops in emergency (HV1) coil electric current be less than or equal to its maximum allowed current, more than or equal to it most During small maintenance electric current, the solenoid valve that stops in emergency (HV1) obtains magnetic, and control diesel engine stops in emergency.
The implementation method of Electromagnetic Valve Circuit failover, warning circuit 9. diesel engine according to claim 8 stops in emergency, It is characterized in that, further include following steps:

In stand-by power supply (DC2) to during parking loop power supply, when power supply (DC1) output of stopping reverts to normal, first is electric Die mould relay coil (KV11) obtains electric, the contact action of first voltage type relay：

(1) the common port of first voltage type relay two-way contact (KV12) and normally open end are connected, recover parking power supply (DC1) to Stop loop power supply；

(2) first voltage type relay normally closed contact (KV13) disconnects, and the 3rd malfunction indicator lamp (MIL3) lighted is extinguished.
Electromagnetic Valve Circuit failover, the realization side of warning circuit 10. diesel engine according to claim 8 stops in emergency Method, which is characterized in that after silicon-controlled (SCR) is powered, wait to remove parking power supply (DC1) and stand-by power supply (DC2), controllably Silicon (SCR) ends.