CN107630753B

CN107630753B - Failure switching and alarming circuit and method for solenoid valve loop of diesel engine emergency stop

Info

Publication number: CN107630753B
Application number: CN201710771046.7A
Authority: CN
Inventors: 张海洋; 王长宝; 凌青华; 齐亮; 孙林; 夏永锋
Original assignee: Jiangsu University of Science and Technology
Current assignee: Jiangsu University of Science and Technology
Priority date: 2017-08-31
Filing date: 2017-08-31
Publication date: 2021-06-15
Anticipated expiration: 2037-08-31
Also published as: CN107630753A

Abstract

The invention discloses a failure switching and alarming circuit of an emergency stop solenoid valve loop of a diesel engine and a method thereof. The method comprises the steps that a parking power supply is directly switched to a standby power supply to supply power and an indicator lamp is used for alarming when the parking power supply fails, the standby electromagnetic valve is switched to carry out emergency parking when an emergency parking electromagnetic valve is in an undercurrent state or an overcurrent state, corresponding indicator lamp alarming prompt is carried out, a circuit of the emergency parking electromagnetic valve is cut off to protect when the electromagnetic valve is in an overcurrent state, and overcurrent protection is carried out until the power supply of an overcurrent switching control circuit is removed and.

Description

Failure switching and alarming circuit and method for solenoid valve loop of diesel engine emergency stop

Technical Field

The invention belongs to the technical field of diesel engine safety protection, and particularly relates to a diesel engine emergency stop electromagnetic valve loop failure switching and alarming circuit and an implementation method thereof.

Background

At present: the emergency stop system of the diesel engine has two modes of gas cut-off and oil cut-off for the emergency stop of the diesel engine, wherein the gas cut-off mode is that electromagnetic control valves are additionally arranged at an air inlet and an air outlet, and the valves can be controlled to cut off gas in emergency; the oil-cut mode is that an oil-cut electromagnetic control valve device is additionally arranged on an oil way, and oil can be cut off emergently when a fault occurs. These solenoid operated valves are commonly referred to as emergency stop solenoid valves. When the electromagnetic valve adopted by the emergency stop electromagnetic valve is a normally closed electromagnetic valve, the designed emergency stop electromagnetic valve loop is demagnetized (power-off) to stop; when the electromagnetic valve adopted by the emergency stop electromagnetic valve is a normally open electromagnetic valve, the designed emergency stop electromagnetic valve loop is magnetically (electrically) stopped. In both methods of demagnetizing (power loss) parking and magnetizing (power on) parking, the prior art documents: the solenoid valve loop monitoring and alarming method in the emergency stopping circuit of the solenoid valve for de-magnetizing to cut off gas or oil of the diesel engine is many, which is not described briefly, and only the main problems of the de-magnetizing stopping method are reiterated: parking error! When the power supply is out of power and/or the emergency stop electromagnetic valve loop is disconnected, the diesel engine is stopped by mistake, and the normal operation of the diesel engine is influenced. And the solenoid valve loop monitoring and alarming method in the emergency stop circuit of the solenoid valve which can magnetically cut off gas or oil of the diesel engine is few. The emergency stop circuit of the electromagnetic valve for cutting off gas or oil by magnetism of the diesel engine comprises the following working processes: when the diesel engine normally works, the emergency stop electromagnetic valve is in a power-off (magnetic loss) state, namely a gas-off and oil-off valve controlled by the emergency stop electromagnetic valve is on when the emergency stop electromagnetic valve is in the power-off state; when the emergency stop electromagnetic valve is electrified (magnetized) under the emergency and major fault conditions, the air cut-off and oil cut-off valve controlled by the emergency stop electromagnetic valve is closed, and the emergency stop of the diesel engine is realized. However, in an emergency stop circuit provided with a solenoid valve for magnetically stopping gas or oil of a diesel engine, when an emergency stop is required, the emergency stop solenoid valve is normally energized to stop the diesel engine suddenly, and when faults such as broken connecting lines, broken coils, short circuits of the coils, poor contact of a power supply circuit and the like occur in a coil outlet of the emergency stop solenoid valve, the emergency stop is required, and a gas or oil stop valve controlled by the emergency stop solenoid valve cannot be closed, so that the emergency stop fails, and the safety of the diesel engine cannot be guaranteed. Therefore, for a diesel engine emergency stop circuit provided with a magnetic solenoid valve for cutting off gas or oil, in order to ensure the execution of safe stop of a diesel engine (a diesel generator), whether a corresponding emergency stop solenoid valve loop fails or not needs to be detected and an alarm needs to be given out urgently. Although described in the literature, patent application nos.: 201510846141.X diesel engine emergency stop solenoid valve return circuit failure warning circuit and alarm method thereof, there is redundant configuration of stand-by power supply and solenoid valve (is the normal open solenoid valve too), solve: when the power supply is cut off, the power supply is switched to a standby power supply for supplying power; when the emergency stop is controlled, the disconnection of the emergency stop electromagnetic valve loop is recognized, the standby electromagnetic valve is switched to be electrified to work, and the controlled gas cut-off and oil cut-off passages are closed through the standby electromagnetic valve. A seemingly perfect setting is practically impossible to achieve at all: when the power supply is cut off, the power supply is switched to a standby power supply for supplying power; when the emergency stop is controlled, the emergency stop electromagnetic valve loop is disconnected, the standby electromagnetic valve is switched to be electrified to work, and the controlled gas cut-off and oil cut-off passages are closed through the standby electromagnetic valve. The reason why it is impossible to switch to the backup power supply when the parking power supply loses power is: because the rated current of the current type relay coil (second current type relay coil) which particularly controls the switching between the parking power supply and the standby power supply is greater than or equal to the rated current of the parking power supply, the current which flows by taking the LED as the first alarm lamp and is connected in series with the current type relay coil cannot be greater than or equal to the rated current of the parking power supply, otherwise, the LED cannot be used as the alarm lamp; when the parking power supply loses power, the current which flows through a first alarm lamp which is connected with a coil of the current-type relay in series and takes the LED as the first alarm lamp is larger than or equal to the rated current of the parking power supply, the current-type relay finishes the switching work of the parking power supply and the standby power supply, so that the rated current of the alarm power supply is required to be larger than or equal to the rated current of the parking power supply, otherwise, the switching of the parking power supply and the standby power supply cannot be normally finished; and because the rated current of the current type relay coil (third current type relay coil) connected in series with the LED as the second alarm lamp is required to be larger than or equal to the rated current of the parking power supply, therefore, in order to ensure the normal operation of the alarm power supply, the rated current of the alarm power supply is required to be more than or equal to twice of the rated current of the parking power supply, in fact, the rated current requirement of the warning power supply cannot be related to the rated current of the parking power supply in engineering design, the current requirement flowing through the warning lamp which is solely powered by the warning power supply cannot be related to the rated current of the parking power supply, and the rated current required by the coil of the current-type relay supplied by the warning power supply is also unlikely to be correlated with the rated current of the parking power supply, and it is also less likely to require that the current flowing through each warning lamp be greater than or equal to the rated current of the power supply supplying it. The reason why it is impossible to switch to the energization operation of the backup solenoid valve when the emergency stop solenoid valve circuit is disconnected at the time of controlling the emergency stop is that: the current type relay (first current type relay) connected in series with the emergency stop solenoid valve circuit can not identify the condition of the emergency stop solenoid valve circuit disconnection at all, because the current type relay coil (first current type relay coil) connected in series with the emergency stop solenoid valve circuit requires that the rated current of the invention is larger than or equal to the rated current of the stop power supply, so that the condition of the emergency stop solenoid valve circuit disconnection can not be identified at all, and the specific reason is that: the method comprises the following steps that firstly, the short circuit situation of the emergency stop electromagnetic valve loop can be only identified, because the set generated normal current cannot be larger than or equal to the rated current of a stop power supply when the emergency stop electromagnetic valve loop is normally electrified and works, and if the generated current is larger than or equal to the rated current of the stop power supply, the short circuit phenomenon of the emergency stop electromagnetic valve loop is determined to occur; when the current type relay connected in series with the emergency stop electromagnetic valve loop does not recognize that the current is larger than or equal to the rated current of the stop power supply, only the current of the emergency stop electromagnetic valve loop is in a normal range or the current is smaller than a normal value or the direct circuit-breaking current is equal to zero because of the enlarged resistance due to poor contact; and thirdly, because the current-type relay connected in series with the emergency stop solenoid valve loop can only identify the short circuit condition of the emergency stop solenoid valve loop, the current flowing through the emergency stop solenoid valve loop is not only normal, but also smaller than normal (such as open circuit): if the current passed through the third current type relay coil connected in series with the second alarm lamp is greater than or equal to the rated current of the parking power supply, the standby electromagnetic valve is also in an electrified working state; in fact, the current of the third current type relay coil connected in series with the second alarm lamp cannot be larger than or equal to the rated current of the parking power supply, so that the standby electromagnetic valve cannot be powered when the current of the emergency parking electromagnetic valve loop is normal or smaller than normal (such as open circuit); because the current type relay connected in series with the emergency stop solenoid valve circuit can only identify the short circuit condition of the emergency stop solenoid valve circuit, when the current of the emergency stop solenoid valve circuit is larger than or equal to the rated current of the stop power supply, the emergency stop solenoid valve circuit is not cut off, the emergency stop solenoid valve circuit is in a power-on state as usual, but a standby solenoid valve without problems is cut off, so the short circuit protection function of the emergency stop solenoid valve circuit cannot be realized, the emergency stop can not be carried out by switching to the standby solenoid valve, and the overload protection function of the stop power supply cannot be realized. To reiterate further: because the rated current of two current type relay coils connected in series on the alarm lamp is required to be greater than or equal to the rated current of the parking power supply, the rated current of the alarm power supply is difficult to be greater than or equal to more than two times of the rated current of the parking power supply! And each LED as the alarm lamp is turned on, the current flowing through the LED as the alarm lamp is greater than or equal to the rated current of the parking power supply! Otherwise, the current-mode relay connected in series with the alarm lamp has no way to work. There are, of course, patent application numbers: 201510845456.2, the failure alarm circuit of the emergency stop electromagnetic valve loop of the diesel generator and the alarm method thereof are provided with redundant configurations of a standby power supply and an electromagnetic valve (which is a normally open electromagnetic valve) and solve the problems that: when the power supply is cut off, the power supply is switched to a standby power supply for supplying power; when the emergency stop is controlled, the disconnection of the emergency stop electromagnetic valve loop is recognized, the standby electromagnetic valve is switched to be electrified to work, and the controlled gas cut-off and oil cut-off passages are closed through the standby electromagnetic valve. The above functions are realized as if, but except for the existence of patent application numbers: 201510846141.X diesel engine emergency stop solenoid valve return circuit failure warning circuit and all problems and defects that exist of its warning method, still have the power that the alarm lamp used for the electricity produced for diesel generator direct power supply, the alarm lamp instruction can not see at all after diesel generator emergency stop, because when controlling diesel generator emergency stop, the user can't stare the alarm lamp and see, will notice the alarm lamp state after only emergency stop, however diesel generator emergency stop does not generate electricity, talk about what power output. And from the content of the advantageous effects described in the specification of patent application No. 201510846141.X and patent application No. 201510845456.2: the failure alarm circuit of the emergency stop electromagnetic valve loop of the diesel engine (diesel engine generator) can perform self-protection in time when equipment fails so as to ensure the normal work of the emergency stop electromagnetic valve loop, thereby realizing the automatic emergency stop protection of the diesel engine (diesel engine generator) under abnormal conditions. Further, the drawings of patent application No. 201510846141.X and patent application No. 201510845456.2 are schematic structural diagrams of failure alarm circuits of diesel engine (diesel engine generator) emergency stop solenoid valves after a diesel engine main control module sends an emergency stop instruction to a diesel engine (diesel engine generator) emergency stop solenoid valve circuit failure alarm circuit and a switch of a control switch module is switched on, that is, the drawings of patent application No. 201510846141.X and patent application No. 201510845456.2 are schematic structural diagrams of failure alarm circuits of diesel engine (diesel engine generator) emergency stop solenoid valves during emergency stop, so that the emergency stop solenoid valves adopted by the diesel engines (diesel engine generators) described in patent application No. 201510846141.X and patent application No. 201510845456.2 are further described as magnetic stop solenoid valves.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a failure switching and alarming circuit and a method of a solenoid valve circuit for emergency stop of a diesel engine, aiming at the problem that a solenoid valve for obtaining magnetism to cut off gas or oil is arranged for emergency stop of the diesel engine, so that the failure switching of a stop power supply to a standby power supply is realized, when the loop of the solenoid valve for emergency stop is under-current and over-current, the loop is switched to the standby solenoid valve for emergency stop, and when the solenoid valve for emergency stop is over-current, short-circuit protection is also carried out, so that the normal work of the circuit for emergency stop is ensured; and indicating lamps respectively indicate faults, and the overcurrent fault indication is kept until a power supply of the overcurrent detection circuit is removed.

In order to achieve the above purpose, the technical solution of the present invention is:

the failure switching and alarming circuit of the emergency stop solenoid valve loop of the diesel engine comprises a stop power supply DC1, a standby power supply DC2, an alarming power supply DC3, a first voltage type relay, a second voltage type relay, a third voltage type relay, a first current type relay, a second current type relay, an emergency stop solenoid valve HV1, a standby solenoid valve HV2, a first fault indicator MIL1, a second fault indicator MIL2, a third fault indicator MIL3, a first switch module K1 and a second switch module K2; the first voltage type relay coil KV11 is directly connected with the parking power supply DC1 in parallel, the anode of the parking power supply DC1 is connected with the normally open end of the first voltage type relay two-way contact KV12, the anode of the standby power supply DC2 is connected with the normally closed end of the first voltage type relay two-way contact KV12, and the cathode of the standby power supply DC2 is connected with the cathode of the parking power supply DC 1; after a first current type relay coil KI11 is sequentially connected in series with a second current type relay coil KI21, a third voltage type relay normally-closed contact KV33, a coil of an emergency stop electromagnetic valve HV1 and a switch of a first switch module K1, the other end of the first current type relay coil KI11 is connected with the common end of a first voltage type relay bidirectional contact KV12, the other end of the switch of the first switch module K1 is connected with the negative electrode of a stop power supply DC1, a first stop loop is formed by the first current type relay coil KI11 and the stop power supply DC1 or a standby power supply DC2, and the first stop loop is an emergency stop electromagnetic valve loop; after a second voltage type relay normally-open contact KV22 is sequentially connected in series with a coil of a standby electromagnetic valve HV2 and a switch of a second switch module K2, the other end of the second voltage type relay normally-open contact KV22 is connected with a common end of a first voltage type relay bidirectional contact KV12, the other end of a switch of a second switch module K2 is connected with a negative electrode of a parking power supply DC1 to form a second parking loop with the parking power supply DC1 or a standby power supply DC2, and the second parking loop is an emergency parking standby electromagnetic valve loop; a second current type relay normally-open contact KI22 is connected in parallel with a third voltage type relay normally-open contact KV32, one end of the connected parallel connection is connected with the common end of a first voltage type relay bidirectional contact KV12, the other end of the connected parallel connection is connected in series with a third voltage type relay coil KV31 and then is connected to the negative electrode of a parking power supply DC1 to form a third parking loop with a parking power supply DC1 or a standby power supply DC2, and the third parking loop is an emergency parking electromagnetic valve overcurrent switching control loop; one end of a first current type relay normally-closed contact KI12 is connected with the common end of a first voltage type relay bidirectional contact KV12, the other end of the first current type relay normally-closed contact KI12 is connected with a second voltage type relay coil KV21 in series and then is connected to a connecting line of a standby electromagnetic valve HV2 coil and a second switch module K2 switch, and the first current type relay normally-closed contact KI and the second voltage type relay coil KV21 are connected with each other to form a first parking loop with a parking power supply DC1 or a standby power supply DC2, wherein the first parking loop is; the normally closed contact KV13 of the first voltage type relay is connected in series with the third fault indicating lamp MIL3 and then is connected in parallel with the alarm power supply DC3, and forms a parking power failure alarm loop with the alarm power supply DC 3; the common end of the third voltage type relay two-way contact KV34 is connected with the anode of the alarm power supply DC3, the normally open end of the third voltage type relay two-way contact KV34 is connected with the second fault indicator lamp MIL2 in series and then is connected with the cathode of the alarm power supply DC3, and the third voltage type relay two-way contact KV34 and the second fault indicator lamp MIL2 form an emergency stop electromagnetic valve overcurrent alarm loop with the alarm power supply DC 3; the normally closed end of the bidirectional contact KV34 of the third voltage type relay is connected in series with the normally open contact KV23 of the second voltage type relay and the first fault indicator lamp MIL1 and then is connected with the negative electrode of the alarm power supply DC3 to form an emergency stop solenoid valve undercurrent alarm loop together with the alarm power supply DC 3; and the control end of the first switch module K1 and the control end of the second switch module K2 are mutually connected in parallel and then are connected with the output of the diesel engine main control module.

The first malfunction indicator lamp MIL1 described above is used for coil underflow indication of the emergency stop solenoid valve HV1 during an emergency stop, and when the first malfunction indicator lamp MIL1 is turned on, coil underflow of the emergency stop solenoid valve HV1 is described.

The second malfunction indicator lamp MIL2 described above is used for a coil overcurrent full stroke indication of the emergency stop solenoid valve HV1 during an emergency stop, and when the second malfunction indicator lamp MIL2 is turned on, it indicates that the coil of the emergency stop solenoid valve HV1 is overcurrent.

The third malfunction indicator lamp MIL3 is used to indicate that the parking power supply DC1 is out of power, and when the parking power supply third malfunction indicator lamp MIL3 is turned on, it indicates that the parking power supply DC1 is out of service.

The rated voltage of the first voltage type relay coil KV11 is higher than the rated voltage of the parking power supply DC1.

The maximum current allowed to flow by the first voltage-type relay bidirectional contact KV12, the second voltage-type relay normally-open contact KV22 and the third voltage-type relay normally-closed contact KV33 is larger than or equal to the rated current of the stop power supply DC1.

The first current-type relay coil KI11 described above: when the flowing current is larger than or equal to the rated current, the contact of the first current type relay acts, namely a normally open contact is connected, and the normally closed contact is disconnected; when the flowing current is smaller than the rated current, the contact of the first current type relay is in a static state, namely the normally open contact is opened, and the normally closed contact is closed.

The above-described second current-type relay coil KI 21: when the current flowing through the second current type relay is larger than the rated current, the contact of the second current type relay acts, namely the normally open contact is connected, and the normally closed contact is disconnected; when the flowing current is less than or equal to the rated current, the contact of the second current type relay is in a static state, namely the normally open contact is disconnected, and the normally closed contact is connected.

The rated current of the above first current-type relay coil KI11 is set equal to the minimum holding current of the emergency stop solenoid valve HV1 coil; the rated current of the second current-type relay coil KI21 is set equal to the maximum allowable current of the coil of the emergency stop solenoid valve HV1.

The minimum holding current of the coil of the emergency stop solenoid valve HV1 described above is the minimum current that can ensure the normal operation of the emergency stop solenoid valve HV1.

The maximum allowable current of the coil of the emergency stop solenoid valve HV1 described above is the maximum operating current that can ensure that the coil of the emergency stop solenoid valve HV1 is not burned out.

The above first and second switch modules K1 and K2: during the period of receiving the emergency stop control signal emitted by the main control module of the diesel engine, the switch of the corresponding control is switched on, namely the switch of the first switch module K1 is switched on, and the switch of the second switch module K2 is switched on; when the emergency stop control signal sent out by the diesel engine main control module is not received, the correspondingly controlled switch is in an off state, namely the switch of the first switch module K1 is in the off state, and the switch of the second switch module K2 is in the off state.

In order to achieve the above object, another technical solution of the present invention is:

the method for realizing the failure switching and alarming circuit of the emergency stop electromagnetic valve loop of the diesel engine comprises the following steps:

first, the switching process between the parking power DC1 and the standby power DC2

1) When the output of the parking power supply DC1 is normal, the first voltage type relay coil KV11 is electrified, and the contact of the first voltage type relay acts:

the common end of a first voltage type relay bidirectional contact KV12 is connected with a normally open end, and a parking power supply DC1 supplies power to a parking loop;

the first voltage type relay normally-closed contact KV13 is disconnected, and the third fault indicator light MIL3 is turned off;

2) when the parking power supply DC1 fails, the first voltage type relay coil KV11 loses power, and the contact of the first voltage type relay is restored to be static:

the common end of a first voltage type relay bidirectional contact KV12 is connected with a normally closed end, and is switched to a standby power supply DC2 to supply power to a parking loop;

secondly, the normally closed contact KV13 of the first voltage type relay is connected, and a third fault indicator lamp MIL3 is lightened to prompt a user that the parking power supply DC1 is invalid;

process for controlling emergency stop solenoid valve HV1 and standby solenoid valve HV2

1) During the emergency stop of the diesel engine, the switch of the first switch module K1 and the switch of the second switch module K2 are both determined to be switched on, and the third voltage type relay is in a non-electrified self-locking state before entering the emergency stop period of the diesel engine, namely the contact of the third voltage type relay is in a static state:

when a coil of an emergency stop solenoid valve HV1 is in a normal working state, namely, the current flowing through an emergency stop solenoid valve loop is between the minimum maintenance current and the maximum allowable current of the coil of an emergency stop solenoid valve HV1, a contact of a first current type relay acts, and a contact of a second current type relay is in a static state:

firstly, a normally closed contact KI12 of the first current type relay is disconnected, a coil KV21 of the second voltage type relay is not electrified, and a contact of the second voltage type relay is in a static state:

a. the normally open contact KV22 of the second voltage type relay is disconnected, the emergency stop standby electromagnetic valve loop cannot be powered, and the standby electromagnetic valve HV2 is in a field loss state;

b. the normally open contact KV23 of the second voltage type relay is disconnected, and the first fault indicator light MIL1 is turned off;

a normally open contact KI22 of the second current type relay is disconnected, a coil KV31 of the third voltage type relay is not electrified, a contact of the third voltage type relay is in a static state, namely, the normally open contact KV32 of the third voltage type relay, which is connected with the normally open contact KI22 of the second current type relay in parallel and is electrified and self-locked with the third voltage type relay, is disconnected, the normally closed contact KV33 of the third voltage type relay, which is connected in series in an emergency stop solenoid valve loop, is connected, a public end of a bidirectional contact KV34 of the third voltage type relay, which controls an alarm power supply DC3 to supply power to a first fault indicator MIL1 and a second fault indicator MIL2, is disconnected from the normally open end, and the MIL2 of the second fault indicator lamp is extinguished;

the second when the coil of emergency stop solenoid valve HV1 is short-flowing, the electric current that flows through the emergency stop solenoid valve return circuit promptly is less than the minimum maintenance current of emergency stop solenoid valve HV1 coil, the contact of first electric current type relay and the contact of second electric current type relay all are in static:

firstly, a normally closed contact KI12 of the first current type relay is switched on, a coil KV21 of the second voltage type relay is electrified, a contact of the second voltage type relay acts, namely a normally open contact KV22 of the second voltage type relay is switched on, and a normally open contact KV23 of the second voltage type relay is switched on: a normally open contact KV22 of the second voltage type relay is connected, a standby electromagnetic valve loop for emergency stop is electrified, and a standby electromagnetic valve HV2 is magnetized;

secondly, a normally open contact KI22 of the second current type relay is disconnected, a coil KV31 of the third voltage type relay is not electrified, a contact of the third voltage type relay is in a static state, namely, the normally open contact KV32 of the third voltage type relay, which is connected with the normally open contact KI22 of the second current type relay in parallel and is electrified and self-locked with the third voltage type relay, is disconnected, a normally closed contact KV33 of the third voltage type relay, which is connected in series in an emergency stop solenoid valve loop, is connected, and a public end of a bidirectional contact KV34 of the third voltage type relay, which controls an alarm power supply DC3 to supply power to a first fault indicator MIL1 and a second fault indicator MIL2, is disconnected with the normally open end and is connected with the normally closed end:

a. the common end of the bidirectional contact KV34 of the third voltage type relay is disconnected with the normally open end, and the second fault indicator light MIL2 is turned off;

b. the common end of the bidirectional contact KV34 of the third voltage type relay is communicated with the normally closed end, and when the normally open contact KV23 of the second voltage type relay is communicated, the first fault indicator lamp MIL1 is lightened to prompt a user that the coil of the electromagnetic valve HV1 for emergency stop is in short-current;

when the coil of the emergency stop solenoid valve HV1 is overcurrent, namely the current flowing through the emergency stop solenoid valve loop is larger than the maximum allowable current of the coil of the emergency stop solenoid valve HV1, the contact of the first current type relay and the contact of the second current type relay both act:

a normally open contact KI22 of the second current type relay is connected, a coil KV31 of the third voltage type relay is electrified, and a contact of the third voltage type relay acts:

a. a third voltage type relay normally-closed contact KV33 connected in series in the emergency stop electromagnetic valve loop is disconnected, the emergency stop electromagnetic valve loop is cut off, and short-circuit protection is carried out on the emergency stop electromagnetic valve loop;

b. a third voltage type relay normally open contact KV32 which is connected with the second current type relay normally open contact KI22 in parallel is switched on to electrify and lock the third voltage type relay;

c. the common end of the third voltage type relay bidirectional contact KV34 which controls the alarm power supply DC3 to supply power to the first fault indicating lamp MIL1 and the second fault indicating lamp MIL2 is connected with the normally open end and disconnected with the normally closed end:

the common end of the bidirectional contact KV34 of the third voltage type relay is communicated with the normally open end, and the second fault indicator lamp MIL2 is lightened to prompt a user that the coil of the emergency stop electromagnetic valve HV1 is overcurrent;

the common end of the bidirectional contact KV34 of the third voltage type relay is disconnected with the normally closed end, and the first fault indicator light MIL1 is turned off;

d. after the third voltage type relay is electrified and self-locked, the self-locking is released when the power supply to the third voltage type relay is removed, the contact of the third voltage type relay is recovered to be static state from dynamic state, otherwise, the electrified and self-locked state of the third voltage type relay is kept all the time;

the normally closed contact KI12 of the first current type relay is disconnected, the coil KV21 of the second voltage type relay is not electrified, the contact of the second voltage type relay is in a static state, namely the normally open contact KV22 of the second voltage type relay is disconnected, the emergency stop standby electromagnetic valve loop is not electrified, and the standby electromagnetic valve HV2 is demagnetized:

when a third voltage type relay normally-closed contact KV33 connected in series in an emergency stop electromagnetic valve loop is disconnected, the contact of the first current type relay is recovered to be static, namely the first current type relay normally-closed contact KI12 is switched on, a second voltage type relay coil KV21 is electrified, the contact of the second voltage type relay acts, a second voltage type relay normally-open contact KV22 is switched on, and a second voltage type relay normally-open contact KV23 is switched on:

a. when the normally open contact KV22 of the second voltage type relay is switched on, the emergency stop standby electromagnetic valve loop is electrified, and the standby electromagnetic valve HV2 is magnetized;

b. the normally open contact KV23 of the second voltage type relay is switched on, and the first fault indicator lamp (MIL1) in an off state is not influenced;

2) during an emergency stop of the uncontrolled diesel engine, it is assumed that the switch of the first switch module K1 and the switch of the second switch module K2 are both open:

the emergency stop electromagnetic valve HV1 and the standby electromagnetic valve HV2 are in magnetic loss;

secondly, the coil KV21 of the second voltage type relay is not electrified, the contact of the second voltage type relay is in a static state, namely the normally open contact KV23 of the second voltage type relay is disconnected, and the MIL1 of the first fault indicator lamp is turned off;

the third voltage type relay keeps the working state before the emergency stop of the non-control diesel engine:

firstly, before the emergency stop of the non-control diesel engine, the third voltage type relay is in power-on self-locking state, then the third voltage type relay keeps power-on self-locking state, the contact of the third voltage type relay keeps in action state, namely the public end of the third voltage type relay bidirectional contact KV34 for controlling the alarm power supply DC3 to supply power to the first fault indicator light MIL1 and the second fault indicator light MIL2 is connected with the normally open end, and the third voltage type relay normally closed contact KV33 connected in series in the emergency stop electromagnetic valve loop is disconnected:

a. the common end of the bidirectional contact KV34 of the third voltage type relay is communicated with the normally open end, and the second fault indicator lamp MIL2 is kept lighted to prompt a user that the coil of the emergency stop electromagnetic valve HV1 overflows before the user enters the uncontrolled diesel engine and emergently stops;

b. a third voltage type relay normally-closed contact KV33 connected in series in the emergency stop electromagnetic valve loop is disconnected, and the emergency stop electromagnetic valve loop is disconnected by a line segment controlled by the third voltage type relay normally-closed contact KV 33;

before the emergency stop of the non-control diesel engine, the third voltage type relay is in non-power-on self-locking, namely the contact of the third voltage type relay is in a static state, and the coil KV31 of the third voltage type relay is not electrified, then the contact of the third voltage type relay is kept in a static state, namely the common end of the bidirectional contact KV34 of the third voltage type relay, which controls the alarm power supply DC3 to supply power to the first fault indicator light MIL1 and the second fault indicator light MIL2, is disconnected with the normally open end, and the normally closed contact KV33 of the third voltage type relay, which is connected in series in the loop of the electromagnetic valve for emergency stop, is switched on:

b. and a third voltage type relay normally-closed contact KV33 connected in series in the emergency stop electromagnetic valve loop is communicated, and the emergency stop electromagnetic valve loop is communicated by a line segment controlled by the third voltage type relay normally-closed contact KV33.

The method for realizing the failure switching and alarming circuit of the emergency stop solenoid valve loop of the diesel engine further comprises the following steps:

when the standby power supply DC2 supplies power to the parking loop and the output of the power supply DC1 to be parked is recovered to be normal, the first voltage type relay coil KV11 is electrified, and the contact of the first voltage type relay acts:

the common end of a first voltage type relay bidirectional contact KV12 is connected with a normally open end, and a parking power supply DC1 is recovered to supply power to a parking loop;

and the normally closed contact KV13 of the first voltage type relay is disconnected, and the lighted third fault indicator lamp MIL3 is extinguished.

The method for realizing the failure switching and alarm circuit of the emergency stop solenoid valve loop of the diesel engine controls the processes of the emergency stop solenoid valve HV1 and the standby solenoid valve HV2, during the period of controlling the emergency stop of the diesel engine, the switch of the first switch module K1 and the switch of the second switch module K2 are determined to be both switched on, when the third voltage type relay is kept in the power-on self-locking state before the period of controlling the emergency stop of the diesel engine, namely the contact of the third voltage type relay is in action, the emergency stop solenoid valve loop is switched off by the line segment controlled by the normally closed contact KV33 of the third voltage type relay, then the contact of the first current type relay and the contact of the second current type relay are both kept in static state, the coil of the emergency stop solenoid valve HV1 is directly controlled by undercurrent, the contact KI12 of the first current type normally closed relay is switched on, and the second voltage type coil KV21, the contact action of the second voltage type relay specifically includes:

1) the common end of the third voltage type relay bidirectional contact KV34 which controls the alarm power supply DC3 to supply power to the first fault indicating lamp MIL1 and the second fault indicating lamp MIL2 is connected with the normally open end and disconnected with the normally closed end:

the second fault indicator lamp MIL2 is kept lighted, and prompts a user that a coil of an emergency stop electromagnetic valve HV1 is overcurrent, wherein a common end of a bidirectional contact KV34 of the third voltage type relay is communicated with a normally opened end;

the common end of the bidirectional contact KV34 of the third voltage type relay is disconnected with the normally closed end, and the first fault indicator lamp MIL1 is kept turned off;

2) a normally open contact KV22 of the second voltage type relay is connected, a standby electromagnetic valve loop for emergency stop is electrified, and a standby electromagnetic valve HV2 is magnetized;

3) the normally open contact KV23 of the second voltage type relay is connected, and the first fault indicator light MIL1 in the off state is not affected.

The method for realizing the failure switching and alarming circuit of the emergency stop electromagnetic valve loop of the diesel engine further comprises the following steps:

when the third voltage type relay is in a power-on self-locking state, the normally open contact KI22 of the second current type relay is disconnected, and the power-on state of the third voltage type relay in self-locking is not influenced.

According to the method for realizing the failure switching and alarming circuit of the emergency stop solenoid valve circuit of the diesel engine, after the third voltage type relay is electrified and self-locked, the self-locking is released when the power supply to the third voltage type relay is removed, namely, when the stop power supply DC1 and the standby power supply DC2 are removed, the contact of the third voltage type relay is dynamically restored to be static.

Has the advantages that:

the invention relates to a failure switching and alarming circuit of a diesel engine emergency stop electromagnetic valve loop and a method thereof, which are mainly characterized in that:

in the whole process of the diesel engine in the emergency stop period and the non-emergency stop period, once a stop power supply fails, the standby power supply is immediately switched to work, and a third fault indicator lamp MIL3 is lightened to prompt a user that the stop power supply fails; and automatically returning to the parking power supply for supplying power when the parking power supply is recovered to be normal.

Secondly, when the diesel engine is not in overcurrent protection before emergency stop, during the emergency stop of the diesel engine, if the coil of the emergency stop electromagnetic valve HV1 is in undercurrent, the emergency stop is immediately carried out through the standby electromagnetic valve HV2, the first fault indicator lamp MIL1 is lightened, and the user is prompted that the coil of the emergency stop electromagnetic valve HV1 is in undercurrent.

During the emergency stop of the diesel engine, if the coil of the emergency stop solenoid valve HV1 is detected to be overcurrent, the emergency stop solenoid valve loop is immediately cut off, the cut emergency stop solenoid valve loop is subjected to short-circuit protection, the second fault indicator lamp MIL2 is lightened, a user is prompted that the coil of the emergency stop solenoid valve HV1 is overcurrent, the emergency stop method is carried out by switching to the standby solenoid valve HV2 when the coil of the emergency stop solenoid valve HV1 is in the overcurrent state, and the emergency stop is carried out through the standby solenoid valve HV2.

Fourth, during the emergency stop of the diesel engine, overcurrent short-circuit protection is performed, and when the short-circuit protection is performed and the second fault indicating lamp MIL2 is turned on until the stopping power supply DC1 and the standby power supply DC2 are removed, the short-circuit protection is stopped and the turned-on second fault indicating lamp MIL2 is turned off.

And when the diesel engine is subjected to emergency stop, overcurrent protection is performed before the diesel engine is subjected to emergency stop, and emergency stop is performed by directly switching to a standby electromagnetic valve HV2.

Drawings

FIG. 1 is a circuit structure diagram of a failure switching and alarming circuit of an emergency stop solenoid valve circuit of a diesel engine;

in the figure: KV11. first voltage type relay coil, KV12. first voltage type relay bidirectional contact, KV13. first voltage type relay normally closed contact, KV21. second voltage type relay coil, KV22, KV23. second voltage type relay normally open contact, KV31. third voltage type relay coil, KV32. third voltage type relay normally open contact, KV33. third voltage type relay normally closed contact, KV34. third voltage type relay bidirectional contact, KI11. first current type relay coil, KI12. first current type relay normally closed contact, KI21. second current type relay coil, KI22. second current type relay normally open contact, DC1. parking power supply, DC2. standby power supply, DC3. alarm power supply, HV1. emergency parking solenoid valve, HV2. standby solenoid valve, MIL1. first fault indicator lamp, MIL2. second fault indicator lamp, MIL3. third fault indicator lamp, K1. first switch module, K2..

Detailed Description

As shown in fig. 1, the diesel engine emergency stop solenoid valve loop failure switching and alarming circuit includes a stop power supply DC1, a standby power supply DC2, an alarming power supply DC3, a first voltage type relay, a second voltage type relay, a third voltage type relay, a first current type relay, a second current type relay, an emergency stop solenoid valve HV1, a standby solenoid valve HV2, a first fault indicator MIL1, a second fault indicator MIL2, a third fault indicator MIL3, a first switch module K1, and a second switch module K2; the first voltage type relay coil KV11 is directly connected with the parking power supply DC1 in parallel, the anode of the parking power supply DC1 is connected with the normally open end of the first voltage type relay two-way contact KV12, the anode of the standby power supply DC2 is connected with the normally closed end of the first voltage type relay two-way contact KV12, and the cathode of the standby power supply DC2 is connected with the cathode of the parking power supply DC 1; after a first current type relay coil KI11 is sequentially connected in series with a second current type relay coil KI21, a third voltage type relay normally-closed contact KV33, a coil of an emergency stop electromagnetic valve HV1 and a switch of a first switch module K1, the other end of the first current type relay coil KI11 is connected with the common end of a first voltage type relay bidirectional contact KV12, the other end of the switch of the first switch module K1 is connected with the negative electrode of a stop power supply DC1, a first stop loop is formed by the first current type relay coil KI11 and the stop power supply DC1 or a standby power supply DC2, and the first stop loop is an emergency stop electromagnetic valve loop; after a second voltage type relay normally-open contact KV22 is sequentially connected in series with a coil of a standby electromagnetic valve HV2 and a switch of a second switch module K2, the other end of the second voltage type relay normally-open contact KV22 is connected with a common end of a first voltage type relay bidirectional contact KV12, the other end of a switch of a second switch module K2 is connected with a negative electrode of a parking power supply DC1 to form a second parking loop with the parking power supply DC1 or a standby power supply DC2, and the second parking loop is an emergency parking standby electromagnetic valve loop; the second current type relay normally-open contact KI22 is connected in parallel with a third voltage type relay normally-open contact KV32, one end of the connected parallel connection is connected with the common end of a first voltage type relay bidirectional contact KV12, the other end of the connected parallel connection is connected in series with a third voltage type relay coil KV31 and then is connected to the negative electrode of a parking power supply DC1, the parking power supply DC1 or a standby power supply DC2 form a third parking loop, and the third parking loop is an emergency parking electromagnetic valve overcurrent switching control loop; one end of a first current type relay normally-closed contact KI12 is connected with the common end of a first voltage type relay bidirectional contact KV12, the other end of the first current type relay normally-closed contact KI12 is connected with a second voltage type relay coil KV21 in series and then is connected to a connecting line of a standby electromagnetic valve HV2 coil and a second switch module K2 switch, and the first current type relay normally-closed contact KI and the second voltage type relay coil KV21 are connected with each other to form a first parking loop with a parking power supply DC1 or a standby power supply DC2, wherein the first parking loop is; the normally closed contact KV13 of the first voltage type relay is connected in series with the third fault indicating lamp MIL3 and then is connected in parallel with the alarm power supply DC3, and forms a parking power failure alarm loop with the alarm power supply DC 3; the common end of the third voltage type relay two-way contact KV34 is connected with the anode of the alarm power supply DC3, the normally open end of the third voltage type relay two-way contact KV34 is connected with the second fault indicator lamp MIL2 in series and then is connected with the cathode of the alarm power supply DC3, and the third voltage type relay two-way contact KV34 and the second fault indicator lamp MIL2 form an emergency stop electromagnetic valve overcurrent alarm loop with the alarm power supply DC 3; the normally closed end of the bidirectional contact KV34 of the third voltage type relay is connected in series with the normally open contact KV23 of the second voltage type relay and the first fault indicator lamp MIL1 and then is connected with the negative electrode of the alarm power supply DC3 to form an emergency stop solenoid valve undercurrent alarm loop together with the alarm power supply DC 3; and the control end of the first switch module K1 and the control end of the second switch module K2 are mutually connected in parallel and then are connected with the output of the diesel engine main control module.

The above-described emergency stop solenoid valve overcurrent switching control circuit is used for coil overcurrent detection switching control of the emergency stop solenoid valve HV1 during an emergency stop.

The above-described emergency stop solenoid valve under-flow switching control circuit is used for the coil under-flow detection switching control of the emergency stop solenoid valve HV1 during an emergency stop.

The first malfunction indicator lamp MIL1 is used to indicate the coil under-current of the emergency stop solenoid valve HV1 during an emergency stop, and when the first malfunction indicator lamp MIL1 is turned on, it indicates that there is a possibility that the contact failure resistance of the emergency stop solenoid valve circuit becomes large, the coil of the emergency stop solenoid valve HV1 is broken, or the circuit is broken elsewhere, and of course, the power supply may be damaged, resulting in a supply current shortage.

The second malfunction indicator lamp MIL2 is used for indicating the full-range of the coil overcurrent of the emergency stop solenoid valve HV1 during the emergency stop, and when the second malfunction indicator lamp MIL2 is turned on, it indicates that the coil of the emergency stop solenoid valve HV1 in the emergency stop solenoid valve circuit is short-circuited, which of course also includes the possibility that the voltage of the supplied power source is higher.

The third fault indicator lamp MIL3 is used for prompting when the parking power supply DC1 fails, and when the parking power supply third fault indicator lamp MIL3 is lit, it is indicated that the output voltage of the parking power supply DC1 is lower than the maintaining voltage of the first voltage type relay coil KV11 or equal to zero, and here, when the output voltage of the parking power supply DC1 is lower than the maintaining voltage of the first voltage type relay coil KV11 or equal to zero, it is determined that the parking power supply DC1 fails (or the parking power supply DC1 is called to be power-off or voltage-loss).

The rated voltage of the first voltage type relay coil KV11 is greater than the rated voltage of the parking power supply DC1, so that the first voltage type relay coil KV11 can maintain the voltage close to the rated voltage of the parking power supply DC1, and the contact of the first voltage type relay is ensured to be changed from static state to dynamic state, and the rated voltage of the first voltage type relay coil KV11 is selected to be 106% of the rated voltage of the parking power supply DC1.

When the current flowing through the coil of the emergency stop solenoid valve HV1 is between the minimum maintenance current and the maximum allowable current during emergency stop, the coil of the emergency stop solenoid valve HV1 is determined to be in a normal working state, otherwise, the fault of the emergency stop solenoid valve circuit is determined.

The output of the parking power supply DC1 is determined to be a normal output when the contact of the first voltage type relay is attracted (operated).

When the first switch module K1 and the second switch module K2 are in good condition: during the period of receiving an emergency stop (engine) control signal sent out by a diesel engine main control module, the switch of the corresponding control is switched on, namely the switch of a first switch module K1 is switched on, and the switch of a second switch module K2 is switched on; when an emergency stop (engine) control signal sent out by the diesel engine main control module is not received, the correspondingly controlled switch is in an off state, namely the switch of the first switch module K1 is in the off state, and the switch of the second switch module K2 is in the off state.

During the period of receiving the emergency stop control signal output by the diesel engine main control module, that is, during the period of receiving the emergency stop control signal output by the diesel engine main control module, the failure switching and alarm circuit of the diesel engine emergency stop solenoid valve circuit of the invention is in the period of receiving the emergency stop control signal output by the diesel engine main control module, at this time, the failure switching and alarm circuit of the diesel engine emergency stop solenoid valve circuit works in the period of controlling the diesel engine emergency stop.

During the period when the emergency stop control signal emitted by the diesel engine main control module is not received, that is, during the period when the emergency stop control signal emitted by the diesel engine main control module is not received, the diesel engine emergency stop solenoid valve loop of the invention fails to switch and the alarm circuit works during the period when the emergency stop control signal emitted by the diesel engine main control module is not received, at this time, the diesel engine emergency stop solenoid valve loop fails to switch and the alarm circuit works during the non-control diesel engine emergency stop.

The first switch module K1 and the second switch module K2 are considered to be in good condition in the present invention.

The processes of the failure switching of the emergency stop solenoid valve loop of the diesel engine and the switching of the stop power supply DC1 and the standby power supply DC2 of the alarm circuit are as follows:

the common end of a first voltage type relay bidirectional contact KV12 is connected with a normally closed end, and is switched to a standby power supply (DC2) to supply power to a parking loop;

3) when the standby power supply DC2 supplies power to the parking loop and the output of the power supply DC1 to be parked is recovered to be normal, the first voltage type relay coil KV11 is electrified, and the contact of the first voltage type relay acts:

The failure switching and alarm circuit of the emergency stop solenoid valve loop of the diesel engine determines that the switch of the first switch module K1 and the switch of the second switch module K2 are both switched on during the emergency stop of the diesel engine, and the third voltage type relay is in a non-electrified self-locking state before the emergency stop of the diesel engine is controlled, namely the contact of the third voltage type relay is in a static state, and the control emergency stop solenoid valve HV1 and the standby solenoid valve HV2 have the following processes:

1) when the coil of the emergency stop solenoid valve HV1 is in a normal working state, that is, the current flowing through the emergency stop solenoid valve loop is between the minimum holding current and the maximum allowable current of the coil of the emergency stop solenoid valve HV1, the contact of the first current type relay acts, and the contact of the second current type relay is in a static state:

firstly, a normally closed contact KI12 of a first current type relay is disconnected, a coil KV21 of a second voltage type relay is not electrified, and a contact of the second voltage type relay is in a static state:

firstly, a normally open contact KV22 of a second voltage type relay is disconnected, a loop of an emergency stop standby electromagnetic valve is not powered, and a standby electromagnetic valve HV2 is in a field loss state;

the normally open contact KV23 of the second voltage type relay is disconnected, and the first fault indicator light MIL1 is turned off;

secondly, a second current type relay normally-open contact KI22 is disconnected, a third voltage type relay coil KV31 is not electrified, a contact of the third voltage type relay is in a static state, namely the third voltage type relay normally-open contact KV32 which is connected with the second current type relay normally-open contact KI22 in parallel and is electrified and self-locked with the third voltage type relay is disconnected, a third voltage type relay normally-closed contact KV33 which is connected in series in an emergency stop solenoid valve loop is connected, the common end of a third voltage type relay bidirectional contact KV34 which controls an alarm power supply DC3 to supply power to a first fault indicator lamp MIL1 and a second fault indicator lamp MIL2 is disconnected with the normally-open end, and the second fault indicator lamp MIL2 is extinguished;

2) when the coil of the emergency stop solenoid valve HV1 is undercurrent, i.e. the current flowing through the emergency stop solenoid valve loop is less than the minimum holding current of the emergency stop solenoid valve HV1 coil, the contacts of the first current-type relay and the contacts of the second current-type relay are both in a quiescent state:

the first current type relay normally-closed contact KI12 is switched on, the second voltage type relay coil KV21 is electrified, the contact of the second voltage type relay acts, namely, the second voltage type relay normally-open contact KV22 is switched on, and the second voltage type relay normally-open contact KV23 is switched on: a normally open contact KV22 of the second voltage type relay is switched on, a standby electromagnetic valve loop for emergency stop is electrified, and a standby electromagnetic valve (HV2) is magnetized;

the disconnection of a second current type relay normally open contact KI22, the third voltage type relay coil KV31 can not be electrified, the contact of the third voltage type relay is in a static state, namely, the disconnection of the third voltage type relay normally open contact KV32 which is connected with the second current type relay normally open contact KI22 in parallel and is self-locked when the third voltage type relay is electrified, the connection of the third voltage type relay normally closed contact KV33 which is connected in series in an emergency stop solenoid valve loop is realized, and the public end and the normally open end of the third voltage type relay bidirectional contact KV34 for supplying power to a first fault indicator lamp MIL1 and a second fault indicator lamp MIL2 are disconnected by a control alarm power supply DC3, so that the disconnection is realized by the normally closed end:

the common end of a bidirectional contact KV34 of a third voltage type relay is disconnected with a normally open end, and a second fault indicator light MIL2 is turned off;

the common end of the bidirectional contact KV34 of the third voltage type relay is communicated with the normally closed end, and when the normally open contact KV23 of the second voltage type relay is communicated, the first fault indicator lamp MIL1 is lightened to prompt a user that the coil of the electromagnetic valve HV1 for emergency stop is in short-current;

3) when the coil of the emergency stop solenoid valve HV1 is overcurrent, namely the current flowing through the emergency stop solenoid valve loop is larger than the maximum allowable current of the emergency stop solenoid valve HV1 coil, the contact of the first current type relay and the contact of the second current type relay both act:

firstly, a normally open contact KI22 of a second current type relay is switched on, a coil KV31 of a third voltage type relay is electrified, and the contact of the third voltage type relay acts as follows:

firstly, a third voltage type relay normally-closed contact KV33 connected in series in an emergency stop electromagnetic valve loop is disconnected, the emergency stop electromagnetic valve loop is cut off to be electrified, and short-circuit protection is carried out on the emergency stop electromagnetic valve loop;

a third voltage type relay normally open contact KV32 which is connected with a second current type relay normally open contact KI22 in parallel is switched on to electrify and self-lock the third voltage type relay;

the common end of a third voltage type relay bidirectional contact KV34 for controlling the alarm power supply DC3 to supply power to the first fault indicator light MIL1 and the second fault indicator light MIL2 is connected with the normally open end and disconnected with the normally closed end:

a. the common end of the bidirectional contact KV34 of the third voltage type relay is communicated with the normally open end, and the second fault indicator lamp MIL2 is lightened to prompt a user that the coil of the emergency stop electromagnetic valve HV1 is overcurrent;

b. the common end of the bidirectional contact KV34 of the third voltage type relay is disconnected with the normally closed end, and the first fault indicator light MIL1 is turned off;

after the third voltage type relay is electrified and self-locked, the self-locking is released when the power supply to the third voltage type relay is removed, the contact of the third voltage type relay is recovered to be static from dynamic state, otherwise, the electrified and self-locked state of the third voltage type relay is always kept in the following period of emergency stop of the non-controlled diesel engine and the period of emergency stop of the controlled diesel engine;

the disconnection of the normally closed contact KI12 of the first electric current type relay of wall, second voltage type relay coil KV21 must not be electrified, and the contact of second voltage type relay is in static state, and second voltage type relay normally open contact KV22 disconnection promptly, and emergency shutdown reserve solenoid valve return circuit does not switch on, and reserve solenoid valve HV2 loses magnetism:

firstly, a normally open contact KV22 of a second voltage type relay is connected, a loop of the emergency stop standby electromagnetic valve is electrified, and the standby electromagnetic valve HV2 is magnetized;

and secondly, a normally open contact KV23 of the second voltage type relay is connected, and the first fault indicator light MIL1 in an off state is not influenced.

The failure switching and alarming circuit of the emergency stop solenoid valve circuit of the diesel engine recognizes that the switch of the first switch module K1 is turned on and the switch of the second switch module K2 is turned off during the emergency stop of the uncontrolled diesel engine, and the following processes are provided for controlling the emergency stop solenoid valve HV1 and the standby solenoid valve HV 2:

1) the emergency stop electromagnetic valve HV1 and the standby electromagnetic valve HV2 are in magnetic loss;

2) the coil KV21 of the second voltage type relay is not electrified, the contact of the second voltage type relay is in a static state, namely the normally open contact KV23 of the second voltage type relay is disconnected, and the MIL1 of the first fault indicator lamp is turned off;

3) and the third voltage type relay keeps entering a working state before the emergency stop of the non-control diesel engine:

before entering an emergency stop of a non-controlled diesel engine, the third voltage type relay is in power-on self-locking, the third voltage type relay keeps power-on self-locking, a contact of the third voltage type relay is kept in an action state, namely, a common end of a third voltage type relay bidirectional contact KV34 for controlling an alarm power supply DC3 to supply power to a first fault indicator light MIL1 and a second fault indicator light MIL2 is connected with a normally open end, and a third voltage type relay normally closed contact KV33 connected in an emergency stop electromagnetic valve loop in series is disconnected:

the common end of a bidirectional contact KV34 of a third voltage type relay is communicated with a normally open end, and a second lighted fault indicator lamp MIL2 is kept to prompt a user to enter a coil of an emergency stop electromagnetic valve HV1 before an uncontrolled diesel engine is emergently stopped;

a third voltage type relay normally closed contact KV33 connected in series in the emergency stop electromagnetic valve loop is disconnected, and the emergency stop electromagnetic valve loop is disconnected by a line segment controlled by the third voltage type relay normally closed contact KV 33;

the second is when getting into before the emergency stop of non-control diesel engine, the third voltage type relay is in non-circular telegram auto-lock, and the contact of third voltage type relay is in static promptly, and third voltage type relay coil KV31 must not be electrified, then, the contact of third voltage type relay keeps being in static state, controls alarm power DC3 promptly to first fault indicator MIL1 and the disconnection of the public end and the normal open end of the third voltage type relay bidirectional contact KV34 of second fault indicator MIL2 power supply, and the third voltage type relay normally closed contact KV33 switch-on of concatenating in the emergency stop solenoid valve return circuit:

and secondly, a third voltage type relay normally closed contact KV33 connected in series in the emergency stop electromagnetic valve loop is connected, and the emergency stop electromagnetic valve loop is connected by a line segment controlled by the third voltage type relay normally closed contact KV33.

The failure switching and alarming circuit of the solenoid valve circuit for emergency stop of the diesel engine determines that the switch of the first switch module K1 is switched on and the switch of the second switch module K2 is switched on during the control of emergency stop of the diesel engine, and the third voltage type relay is kept in the power-on self-locking state before the diesel engine emergency stop period is controlled, namely, the contact of the third voltage type relay is in action, the line segment of the emergency stop electromagnetic valve loop controlled by the normally closed contact KV33 of the third voltage type relay is disconnected, then, the contact of the first current-type relay and the contact of the second current-type relay are both kept in a static state, and directly enter the coil undercurrent control of the emergency stop solenoid valve HV1, the normally closed contact KI12 of the first current-type relay is switched on, the coil KV21 of the second voltage-type relay is electrified, the contact of the second voltage-type relay acts, and the following processes are provided for controlling the emergency stop solenoid valve HV1 and the standby solenoid valve HV 2:

The third voltage type relay is in power-on self-locking, and when the normally open contact KI22 of the second current type relay is disconnected, the power-on state of the third voltage type relay in self-locking is not influenced.

The third voltage type relay is in power-on self-locking state, and releases self-locking when power supply to the third voltage type relay is to be removed, namely, when the parking power supply DC1 and the standby power supply DC2 are to be removed, the contact of the third voltage type relay is restored to be static state from dynamic state.

Claims

1. The failure switching and alarming circuit of the emergency stop solenoid valve loop of the diesel engine comprises a stop power supply (DC1), a standby power supply (DC2), an alarming power supply (DC3), a first voltage type relay, a second voltage type relay, a third voltage type relay, a first current type relay, a second current type relay, an emergency stop solenoid valve (HV1), a standby solenoid valve (HV2), a first fault indicator lamp (MIL1), a second fault indicator lamp (MIL2), a third fault indicator lamp (MIL3), a first switch module (K1) and a second switch module (K2); the parking system is characterized in that the first voltage type relay coil (KV11) is directly connected with a parking power supply (DC1) in parallel, the positive electrode of the parking power supply (DC1) is connected with the normally open end of the first voltage type relay bidirectional contact (KV12), the positive electrode of the standby power supply (DC2) is connected with the normally closed end of the first voltage type relay bidirectional contact (KV12), and the negative electrode of the standby power supply (DC2) is connected with the negative electrode of the parking power supply (DC 1); after a first current type relay coil (KI11) is sequentially connected in series with a second current type relay coil (KI21), a third voltage type relay normally-closed contact (KV33), a coil of an emergency stop solenoid valve (HV1) and a switch of a first switch module (K1), the other end of the first current type relay coil (KI11) is connected with a common end of a first voltage type relay bidirectional contact (KV12), the other end of the switch of the first switch module (K1) is connected with a negative electrode of a stop power supply (DC1) to form a first stop loop with the stop power supply (DC1) or a standby power supply (DC2), and the first stop loop is an emergency stop solenoid valve loop; after a second voltage type relay normally-open contact (KV22) is sequentially connected in series with a coil of a standby electromagnetic valve (HV2) and a switch of a second switch module (K2), the other end of the second voltage type relay normally-open contact (KV22) is connected with a common end of a first voltage type relay bidirectional contact (KV12), the other end of the switch of the second switch module (K2) is connected with a negative electrode of a parking power supply (DC1) to form a second parking loop with the parking power supply (DC1) or the standby power supply (DC2), and the second parking loop is an emergency parking standby electromagnetic valve loop; a second current type relay normally-open contact (KI22) is connected with a third voltage type relay normally-open contact (KV32) in parallel, one end of the connected parallel connection is connected with the common end of a first voltage type relay bidirectional contact (KV12), the other end of the connected parallel connection is connected with the negative electrode of a parking power supply (DC1) after being connected with a third voltage type relay coil (KV31) in series, and the parking power supply (DC1) or a standby power supply (DC2) form a third parking loop, and the third parking loop is an emergency parking electromagnetic valve overcurrent switching control loop; one end of a normally closed contact (KI12) of the first current type relay is connected with the common end of a bidirectional contact (KV12) of the first voltage type relay, the other end of the normally closed contact is connected with a coil (KV21) of the second voltage type relay in series and then is connected to a connecting line of a coil of a standby electromagnetic valve (HV2) and a switch of the second switch module (K2) to form a fourth parking loop with a parking power supply (DC1) or the standby power supply (DC2), and the fourth parking loop is an emergency parking electromagnetic valve undercurrent switching control loop; the normally closed contact (KV13) of the first voltage type relay is connected with the third fault indicator lamp (MIL3) in series and then is connected with the alarm power supply (DC3) in parallel, and the normally closed contact and the alarm power supply (DC3) form a parking power supply failure alarm loop; the common end of the third voltage type relay two-way contact (KV34) is connected with the anode of the alarm power supply (DC3), the normally open end of the third voltage type relay two-way contact (KV34) is connected with the cathode of the alarm power supply (DC3) after being connected with the second fault indicator lamp (MIL2) in series, and the third voltage type relay two-way contact and the alarm power supply (DC3) form an overcurrent alarm loop of the emergency stop electromagnetic valve; the normally closed end of the third voltage type relay bidirectional contact (KV34) is connected in series with the second voltage type relay normally open contact (KV23) and the first fault indicator lamp (MIL1), then is connected with the negative electrode of the alarm power supply (DC3), and forms an emergency stop solenoid valve undercurrent alarm loop with the alarm power supply (DC 3); and the control end of the first switch module (K1) and the control end of the second switch module (K2) are connected in parallel and then connected with the output of the diesel engine main control module.

2. The diesel engine emergency stop solenoid valve loop failure switching, alarm circuit of claim 1, wherein the rated current of the first current-type relay coil (KI11) is equal to the minimum holding current of the emergency stop solenoid valve (HV1) coil; the rated current of the second current-type relay coil (KI21) is equal to the maximum allowable current of the coil of the emergency stop solenoid valve (HV 1).

3. The circuit for switching failure and alarming of the emergency stop solenoid valve circuit of the diesel engine as claimed in claim 1, wherein the maximum current allowed to flow by the first voltage type relay bidirectional contact (KV12), the second voltage type relay normally open contact (KV22) and the third voltage type relay normally closed contact (KV33) is equal to or greater than the rated current of the stop power supply (DC 1).

4. The circuit for switching failure and alarming of emergency stop solenoid valve circuit of diesel engine as claimed in claim 2, wherein the minimum maintaining current of the coil of the emergency stop solenoid valve (HV1) is the minimum current capable of ensuring the normal operation of the emergency stop solenoid valve (HV 1).

5. The circuit for switching failure and alarming of emergency stop solenoid valve circuit of diesel engine as claimed in claim 2, wherein the maximum allowable current of the coil of the emergency stop solenoid valve (HV1) is the maximum working current which can ensure that the coil of the emergency stop solenoid valve (HV1) is not burnt out.

6. A method for realizing the failure switching and alarming circuit of the emergency stop solenoid valve circuit of the diesel engine according to any one of claims 1 to 3, characterized by comprising the following steps:

first, parking power (DC1) and backup power (DC2) switching process

1) When the output of the parking power supply (DC1) is normal, a first voltage type relay coil (KV11) is electrified, and the contact of the first voltage type relay acts:

the common end of a first voltage type relay bidirectional contact (KV12) is communicated with a normally open end, and a parking power supply (DC1) supplies power to a parking loop;

the first voltage type relay normally-closed contact (KV13) is disconnected, and the third fault indicator lamp (MIL3) is turned off;

2) when the parking power supply (DC1) fails, the first voltage type relay coil (KV11) loses power, and the contact of the first voltage type relay is restored to be static:

the common end of a first voltage type relay bidirectional contact (KV12) is connected with a normally closed end, and is switched to a standby power supply (DC2) to supply power to a parking loop;

secondly, the first voltage type relay normally-closed contact (KV13) is connected, and the third fault indicator lamp (MIL3) is lightened to prompt a user that the parking power supply (DC1) fails;

second, process for controlling emergency stop solenoid valve (HV1) and standby solenoid valve (HV2)

1) During the emergency stop of the diesel engine, the switch of the first switch module (K1) and the switch of the second switch module (K2) are both determined to be switched on, and the third voltage type relay is in a non-electrified self-locking state before entering the emergency stop period of the diesel engine, namely the contact of the third voltage type relay is in a static state:

when a coil of an emergency stop solenoid valve (HV1) is in a normal working state, namely the current flowing through an emergency stop solenoid valve loop is between the minimum maintenance current and the maximum allowable current of the coil of the emergency stop solenoid valve (HV1), a contact of a first current type relay acts, and a contact of a second current type relay is in a static state:

the normally closed contact (KI12) of the first current type relay is disconnected, the coil (KV21) of the second voltage type relay is not electrified, and the contact of the second voltage type relay is in a static state:

a. the normally open contact (KV22) of the second voltage type relay is disconnected, the emergency stop standby electromagnetic valve loop cannot be powered, and the standby electromagnetic valve (HV2) is in a field loss state;

b. the normally open contact (KV23) of the second voltage type relay is disconnected, and the first fault indicator lamp (MIL1) is turned off;

a normally open contact (KI22) of the second current type relay is disconnected, a coil (KV31) of the third voltage type relay is not electrified, a contact of the third voltage type relay is in a static state, namely, the normally open contact (KV32) of the third voltage type relay, which is connected with the normally open contact (KI22) of the second current type relay in parallel and is electrified and self-locked with the third voltage type relay, is disconnected, the normally closed contact (KV33) of the third voltage type relay, which is connected in series in an emergency stop solenoid valve loop, is connected, a common end of a bidirectional contact (KV34) of the third voltage type relay, which controls an alarm power supply (DC3) to supply power to a first fault indicator lamp (MIL1) and a second fault indicator lamp (MIL2), is disconnected with the normally open end, and the second fault indicator lamp (MIL2) is extinguished;

the second when the coil of the emergency stop solenoid valve (HV1) is under-flowed, that is, the current flowing through the emergency stop solenoid valve loop is less than the minimum maintaining current of the coil of the emergency stop solenoid valve (HV1), the contact of the first current type relay and the contact of the second current type relay are both in a static state:

the normally closed contact (KI12) of the first current type relay is connected, the coil (KV21) of the second voltage type relay is electrified, the contact of the second voltage type relay acts, namely, the normally open contact (KV22) of the second voltage type relay is connected, and the normally open contact (KV23) of the second voltage type relay is connected: a normally open contact (KV22) of a second voltage type relay is connected, the emergency stop standby electromagnetic valve loop is electrified, and a standby electromagnetic valve (HV2) is magnetized;

a normally open contact (KI22) of the second current type relay is disconnected, a coil (KV31) of the third voltage type relay is not electrified, a contact of the third voltage type relay is in a static state, namely, the normally open contact (KV32) of the third voltage type relay, which is connected with the normally open contact (KI22) of the second current type relay in parallel and is electrified and self-locked with the third voltage type relay, is disconnected, the normally closed contact (KV33) of the third voltage type relay, which is connected in series in an emergency stop solenoid valve loop, is connected, a common end of a bidirectional contact (KV34) of the third voltage type relay, which controls an alarm power supply (DC3) to supply power to a first fault indicator lamp (MIL1) and a second fault indicator lamp (MIL2), is disconnected with a normally open end and is connected with a normally closed end:

a. the common end of the bidirectional contact (KV34) of the third voltage type relay is disconnected with the normally open end, and the second fault indicator lamp (MIL2) is turned off;

b. the common end of the bidirectional contact (KV34) of the third voltage type relay is communicated with the normally closed end, and when the normally open contact (KV23) of the second voltage type relay is communicated, the first fault indicating lamp (MIL1) is lightened to prompt a user that the coil of the emergency stop electromagnetic valve (HV1) is short-flowing;

when the coil of the emergency stop solenoid valve (HV1) is overcurrent, namely the current flowing through the emergency stop solenoid valve loop is larger than the maximum allowable current of the coil of the emergency stop solenoid valve (HV1), the contact of the first current type relay and the contact of the second current type relay both act:

a normally open contact (KI22) of the second current type relay is connected, a coil (KV31) of the third voltage type relay is electrified, and a contact of the third voltage type relay acts:

a. a third voltage type relay normally-closed contact (KV33) connected in series in the emergency stop electromagnetic valve loop is disconnected, the emergency stop electromagnetic valve loop is cut off to be electrified, and short-circuit protection is carried out on the emergency stop electromagnetic valve loop;

b. a third voltage type relay normally open contact (KV32) which is connected with the second current type relay normally open contact (KI22) in parallel is switched on to electrify and self-lock the third voltage type relay;

c. a common terminal of a third voltage type relay bidirectional contact (KV34) controlling the alarm power source (DC3) to supply power to the first fault indicating lamp (MIL1) and the second fault indicating lamp (MIL2) is connected with the normally open terminal and disconnected with the normally closed terminal:

the common end of the bidirectional contact (KV34) of the third voltage type relay is communicated with the normally opened end, and the second fault indicator lamp (MIL2) is lightened to prompt a user that the coil of the emergency stop electromagnetic valve (HV1) is overcurrent;

the common end of the bidirectional contact (KV34) of the third voltage type relay is disconnected with the normally closed end, and the first fault indicator lamp (MIL1) is turned off;

the normally closed contact (KI12) of the first current type relay is disconnected, the coil (KV21) of the second voltage type relay is not electrified, the contact of the second voltage type relay is in a static state, namely the normally open contact (KV22) of the second voltage type relay is disconnected, the emergency stop standby electromagnetic valve loop is not electrified, and the standby electromagnetic valve (HV2) is demagnetized:

when a third voltage type relay normally-closed contact (KV33) connected in series in an emergency stop electromagnetic valve loop is disconnected, the contact of the first current type relay is recovered to be static, namely, the first current type relay normally-closed contact (KI12) is switched on, a second voltage type relay coil (KV21) is electrified, the contact of the second voltage type relay acts, a second voltage type relay normally-open contact (KV22) is switched on, and the second voltage type relay normally-open contact (KV23) is switched on:

a. when the normally open contact (KV22) of the second voltage type relay is switched on, the emergency stop standby electromagnetic valve loop is electrified, and the standby electromagnetic valve (HV2) is magnetized;

b. the normally open contact (KV23) of the second voltage type relay is connected, and the first fault indicator lamp (MIL1) in an off state is not influenced;

2) during an emergency stop of the uncontrolled diesel engine, it is assumed that the switch of the first switch module (K1) and the switch of the second switch module (K2) are both open:

the emergency stop solenoid valve (HV1) and the standby solenoid valve (HV2) are in a magnetic loss state;

secondly, the coil (KV21) of the second voltage type relay is not electrified, the contact of the second voltage type relay is in a static state, namely the normally open contact (KV23) of the second voltage type relay is disconnected, and the first fault indicator lamp (MIL1) is turned off;

firstly, before the emergency stop of the non-control diesel engine, the third voltage type relay is in power-on self-locking state, then the third voltage type relay keeps power-on self-locking state, the contact of the third voltage type relay keeps in action state, namely the public end of the third voltage type relay bidirectional contact (KV34) which controls the alarm power supply (DC3) to supply power to the first fault indicator lamp (MIL1) and the second fault indicator lamp (MIL2) is connected with the normally open end, and the third voltage type relay normally closed contact (KV33) which is connected in series in the emergency stop electromagnetic valve loop is disconnected:

a. the common end of the bidirectional contact (KV34) of the third voltage type relay is communicated with the normally opened end, and a second fault indicator lamp (MIL2) is kept lighted to prompt a user to enter a coil of an emergency stop electromagnetic valve (HV1) before the diesel engine is controlled to be stopped emergently;

b. a third voltage type relay normally closed contact (KV33) connected in series in the emergency stop electromagnetic valve loop is disconnected, and the emergency stop electromagnetic valve loop is disconnected by a line segment controlled by the third voltage type relay normally closed contact (KV 33);

before the diesel engine enters an emergency stop of the uncontrolled diesel engine, the third voltage type relay is in non-power-on self-locking, namely a contact of the third voltage type relay is in a static state, a coil (KV31) of the third voltage type relay is not electrified, then the contact of the third voltage type relay is kept in the static state, namely a common end of a bidirectional contact (KV34) of the third voltage type relay, which is used for controlling an alarm power supply (DC3) to supply power to a first fault indicator lamp (MIL1) and a second fault indicator lamp (MIL2), is disconnected with a normally open end, and a normally closed contact (KV33) of the third voltage type relay, which is connected in series in a loop of the electromagnetic valve for emergency stop, is switched on:

b. and a third voltage type relay normally-closed contact (KV33) connected in series in the emergency stop electromagnetic valve loop is connected, and the emergency stop electromagnetic valve loop is communicated by a line segment controlled by the third voltage type relay normally-closed contact (KV 33).

7. The method for realizing the failure switching and alarming circuit of the emergency stop solenoid valve circuit of the diesel engine as recited in claim 6, further comprising the following steps:

when the output of a power supply (DC1) to be stopped is recovered to be normal during the period that the standby power supply (DC2) supplies power to the parking loop, a first voltage type relay coil (KV11) is electrified, and a contact of a first voltage type relay acts:

the common end of a first voltage type relay bidirectional contact (KV12) is communicated with a normally open end, and a parking power supply (DC1) is recovered to supply power to a parking loop;

and the first voltage type relay normally closed contact (KV13) is disconnected, and the lighted third fault indicator lamp (MIL3) is turned off.

8. The method for realizing the failure switching and alarming circuit of the emergency stop solenoid valve circuit of the diesel engine as recited in claim 6, further comprising: the process of controlling the emergency stop solenoid valve (HV1) and the backup solenoid valve (HV2) recognizes that the switch of the first switch module (K1) and the switch of the second switch module (K2) are both turned on during the control of the emergency stop of the diesel engine, when the third voltage type relay is kept in the power-on self-locking state before the period of controlling the emergency stop of the diesel engine, namely, the contact of the third voltage type relay is in action, the line segment of the emergency stop electromagnetic valve loop controlled by the normally closed contact (KV33) of the third voltage type relay is broken, then, the contact of the first current type relay and the contact of the second current type relay are both kept in static state, and directly enter the coil undercurrent control of the emergency stop solenoid valve (HV1), the normally closed contact (KI12) of the first current type relay is switched on, the coil (KV21) of the second voltage type relay is electrified, and the contact action of the second voltage type relay specifically comprises the following steps:

1) a common terminal of a third voltage type relay bidirectional contact (KV34) controlling the alarm power source (DC3) to supply power to the first fault indicating lamp (MIL1) and the second fault indicating lamp (MIL2) is connected with the normally open terminal and disconnected with the normally closed terminal:

the second fault indicator lamp (MIL2) is kept on and prompts a user that a coil of an emergency stop electromagnetic valve (HV1) is over-current, wherein a common end of a bidirectional contact (KV34) of a third voltage type relay is communicated with a normally opened end;

a first fault indicator lamp (MIL1) which is used for disconnecting the common end of the bidirectional contact (KV34) of the third voltage type relay from the normally closed end and keeping the disconnection;

2) a normally open contact (KV22) of a second voltage type relay is connected, the emergency stop standby electromagnetic valve loop is electrified, and a standby electromagnetic valve (HV2) is magnetized;

3) the normally open contact (KV23) of the second voltage type relay is connected, and the first fault indicator lamp (MIL1) in the off state is not influenced.

9. The method for realizing the failure switching and alarming circuit of the emergency stop solenoid valve circuit of the diesel engine as claimed in claim 6 or 8, further comprising the following steps:

when the third voltage type relay is in a power-on self-locking state, the normally open contact (KI22) of the second current type relay is disconnected, and the power-on state of the self-locking third voltage type relay is not influenced.

10. The method for realizing the circuit for switching the emergency stop solenoid valve loop failure and alarming of the diesel engine as recited in claim 6, wherein after the third voltage type relay is electrified and self-locked, the self-locking is released when the power supply to the third voltage type relay is removed, which means that the contact of the third voltage type relay is dynamically restored to be static when the parking power supply (DC1) and the standby power supply (DC2) are removed.