CN107359598B - A kind of inlet air heating relay fault diagnosis and protection circuit, method and system - Google Patents
A kind of inlet air heating relay fault diagnosis and protection circuit, method and system Download PDFInfo
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- CN107359598B CN107359598B CN201710764285.XA CN201710764285A CN107359598B CN 107359598 B CN107359598 B CN 107359598B CN 201710764285 A CN201710764285 A CN 201710764285A CN 107359598 B CN107359598 B CN 107359598B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for switches
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of inlet air heating relay fault diagnosis and protection circuits, method and system, the present invention is in such a way that electronic control unit ECU acquires inlet air heating grid high side voltage, accurate judgement inlet air heating relay whether adhesion, after the adhesion of inlet air heating relay occurs for detection, the 4th stitch X4 of ECU is connected with smart electronics fan, control output control signal controls the full-speed operation of smart electronics fan, so that the sum of inlet air heating grid electric current and smart electronics fan electrical current are greater than fusting current, introduce high current, actively disconnect inlet air heating grid power supply circuit, inlet air heating grid is no longer heated, smart electronics fan no longer works simultaneously, therefore, it can be burnt to avoid route and cause economic loss and safety accident.
Description
Technical field
The present invention relates to engine and full-vehicle control technical fields, examine more particularly to a kind of inlet air heating relay failure
Disconnected and protection circuit, method and system.
Background technique
Before the cold start-up of automobile engine or cold start-up after a period of time, be required to the air inputted into engine into
Row heating, its purpose is to improve the low-temperature startup performance of engine, prevents from causing gaseous mixture cannot because intake air temperature is too low
Burning " over-emitting black exhaust ".
In order to realize the inlet air heating to engine, ECU (Electronic Control Unit, electronics control are mostly used greatly
Unit processed) control inlet air heating relay opening and closing come control inlet air heating grid in pipeline for electric heating, in inlet air heating
When relay is closed, battery is heated to the power supply of inlet air heating grid；When inlet air heating relay disconnects, battery stops
Only it is powered to inlet air heating grid.But in actual use, due to the physical cause of inlet air heating relay contacts part
(when such as inlet air heating relay does not have to for a long time, the situation that is soaked with rain occurs), it is understood that there may be inlet air heating relay is long
Time closure cannot normally open situation, i.e., (referring to that two copper sheets of relay fit together leads to inlet air heating for adhesion
Relay is constantly on state, is not controlled by ECU), it is sharply increased so as to cause intake air temperature, keeps inlet air heating grid long
Time is in high current working condition, and then inlet air heating grid wires route is caused to burn, and may cause vehicle when serious and rises
Fire threatens the personal safety of driver, therefore, to judging whether adhesion is very important inlet air heating relay.
Report can only be passed through after judgement sticks together by acquiring inlet air heating grid operating voltage by ECU in the prior art
Alert prompt driver's inlet air heating relay sticks together, and needs to wait for driver and debugs manually, and is unable to active process event
Barrier, if driver debugs not in time, long-time is in high current working condition by inlet air heating grid, and route is caused to burn
It ruins and causes economic loss and safety accident.
Summary of the invention
It is an object of the invention to propose a kind of inlet air heating relay fault diagnosis and protection circuit, method and system,
It when inlet air heating relay sticks together failure, actively debugs, disconnects inlet air heating grid heated current, avoid occurring
Route, which is burnt, causes economic loss and safety accident.
In order to achieve the above objectives, the present invention provides following technical schemes:
A kind of inlet air heating relay fault diagnosis and protection circuit, comprising: electronic control unit ECU, inlet air heating after
Electric appliance, inlet air heating grid, circuit protection device and smart electronics fan, in which:
The first stitch and the second stitch of the ECU is connected with the input circuit of the inlet air heating relay, and described
One stitch and second stitch are that the inlet air heating relay controls stitch, by controlling the inlet air heating relay
It is opened or closed to control whether the inlet air heating grid works；
The output loop first end of the inlet air heating relay passes through the circuit protection device and battery positive voltage
It is connected, second end is connected with the first end of the inlet air heating grid；
The second end of the inlet air heating grid is grounded；
The third stitch phase of the common end A point of the inlet air heating relay and the inlet air heating grid and the ECU
Even, the third stitch is the analog acquisition passage of the ECU；
The 4th stitch of the ECU is connected with the smart electronics fan, and output control signal controls the smart electronics
Fan running.
Preferably, the 4th stitch of the ECU is connected with the PWM of smart electronics fan driving end, output control letter
Number control smart electronics fan running.
Preferably, the 4th stitch of the ECU is connected by CAN communication with the control unit of the smart electronics fan,
Output control signal controls the smart electronics fan running.
Preferably, the circuit protection device is fuse.
A kind of inlet air heating relay fault diagnosis and guard method are applied to inlet air heating relay fault diagnosis electricity
Road, the inlet air heating relay fault diagnosis circuit include: electronic control unit ECU, inlet air heating relay, inlet air heating
Grid, circuit protection device and smart electronics fan, this method comprises:
Whether S1, the output state for monitoring second stitch of ECU are 0, if it is not, then into S2, if it is, described
ECU third stitch monitors the voltage of the common end A point, into S5；
S2, monitoring current ambient environmental temperature, when the current ambient environmental temperature reaches preset temperature, described in monitoring
Can inlet air heating grid work normally；
S3, when the inlet air heating grid is normal operating conditions, and heating time reaches default heating time, it is described
It is 0 that ECU, which controls the second stitch output state, disconnects the inlet air heating relay；
After S4, delay predetermined time delay, the ECU third stitch monitors the voltage of the common end A point；
Whether S5, the voltage for judging the common end A point are high level, if so, into S6, if it is not, then trouble light is not
Alarm；
S6, when the voltage of the common end A point is greater than 4.5V, i.e., the voltage of the described common end A point is high level, then described
Inlet air heating relay sticks together, and reports the inlet air heating relay adhesion fault；
The 4th stitch output control signal of S7, the ECU, control the smart electronics fan full speed running, it is described into
The sum of gas heater grid electric current and the smart electronics fan electrical current are greater than the electric current of the circuit protection device, then described in disconnection
Circuit protection device.
Preferably, can the monitoring inlet air heating grid work normally, comprising:
S21, the control inlet air heating relay conducting, the ECU third stitch monitor the electricity of the common end A point
Pressure；
Whether S22, the voltage for judging the common end A point are high level；
S23, when the voltage of the common end A point is less than 0.5V, i.e., the voltage of the described common end A point is low level, then institute
It states inlet air heating relay and is in open-circuit condition, report the inlet air heating relay open-circuit fault；
S24, when the voltage for monitoring the common end A point is greater than 4.5V, i.e., the voltage of the described common end A point is high level,
Then the inlet air heating grid works normally.
Preferably, further includes:
Monitor the voltage of the common end A point；
When the voltage of the common end A point is less than 0.5V, then the circuit protection device disconnects, the inlet air heating lattice
Grid and the smart electronics fan stop working.
A kind of inlet air heating relay fault diagnosis and protection system, comprising:
First monitoring unit, whether the output state for monitoring second stitch of ECU is 0；
Second detection unit, for monitoring current ambient environmental temperature, when the current ambient environmental temperature reaches default
When temperature, can monitor the inlet air heating grid be worked normally；
First switching units, for being normal operating conditions when the inlet air heating grid, and heating time reaches and presets
When heating time, it is 0 that the ECU, which controls the second stitch output state, disconnects the inlet air heating relay；
Third monitoring unit, after postponing predetermined time delay, the ECU third stitch monitors the common end A point
Voltage；
First judging unit, for judging whether the voltage of the common end A point is high level；
Alarm unit is greater than 4.5V for the voltage when the common end A point, i.e., the voltage of the described common end A point is height
Level, then the inlet air heating relay sticks together, and reports the inlet air heating relay adhesion fault；
It is complete to control the smart electronics fan for the 4th stitch output control signal of the ECU for second switching units
Speed operation, the sum of the inlet air heating grid electric current and the smart electronics fan electrical current are greater than the electricity of the circuit protection device
Stream, then disconnect the circuit protection device.
Preferably, second monitoring unit includes:
Subelement is monitored, for controlling the inlet air heating relay conducting, the ECU third stitch monitoring is described public
Hold the voltage of A point；
Second judgment unit judges whether the voltage of the common end A point is high level；
When the voltage of the common end A point is less than 0.5V, i.e., the voltage of the described common end A point is low level, then it is described into
Gas heating relay is in open-circuit condition, reports the inlet air heating relay open-circuit fault；
When the voltage for monitoring the common end A point is greater than 4.5V, i.e., the voltage of the described common end A point is high level, then institute
State inlet air heating grid normal work.
Preferably, further includes:
4th monitoring unit, for monitoring the voltage of the common end A point；
Third switching units, for when the voltage of the common end A point is less than 0.5V, then the circuit protection device to be disconnected
It opens, the inlet air heating grid and the smart electronics fan stop working.
It can be seen via above technical scheme that compared with prior art, the invention discloses a kind of inlet air heating relays
Fault diagnosis and protection circuit, method and system, the present invention acquire inlet air heating grid flash electricity by electronic control unit ECU
The mode of pressure, accurate judgement inlet air heating relay whether adhesion, when detection occur the adhesion of inlet air heating relay after, ECU's
4th stitch X4 is connected with smart electronics fan, and control output control signal controls the full-speed operation of smart electronics fan, so that into
The sum of gas heater grid electric current and smart electronics fan electrical current be greater than fusting current, introduce high current, actively disconnect into
Gas heater grid power supply circuit, inlet air heating grid are no longer heated, while smart electronics fan no longer works, therefore, can
It is burnt to avoid route and causes economic loss and safety accident.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 provides one a kind of inlet air heating relay fault diagnosis and protection circuit schematic diagram for the embodiment of the present invention；
Fig. 2 provides two a kind of inlet air heating relay fault diagnosis and protection circuit schematic diagram for the embodiment of the present invention；
Fig. 3 is a kind of inlet air heating relay fault diagnosis and guard method process signal provided in an embodiment of the present invention
Figure；
Fig. 4 is the step flow chart that can monitoring inlet air heating grid provided in an embodiment of the present invention work normally；
Fig. 5 is the step flow chart that can monitoring inlet air heating grid provided in an embodiment of the present invention work normally；
Fig. 6 is a kind of inlet air heating relay fault diagnosis provided in an embodiment of the present invention and protection system structure signal
Figure；
Fig. 7 is the structural schematic diagram of the second monitoring unit in the embodiment of the present invention；
Fig. 8 is a kind of further structural representation of inlet air heating relay fault diagnosis system provided in an embodiment of the present invention
Figure.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Relational language is explained:
ECU:Electrical Control Unit, electronic control unit；
Adhesion: referring to that two copper sheets of relay fit together causes inlet air heating relay to be constantly in conducting shape
State is not controlled by ECU.
Embodiment one
Please refer to attached drawing 1, Fig. 1 is a kind of inlet air heating relay fault diagnosis and protection that the embodiment of the present invention one provides
Circuit diagram.As shown in Figure 1, the embodiment of the invention discloses a kind of inlet air heating relay fault diagnosis and protection circuit,
The circuit specifically includes: electronic control unit ECU1, inlet air heating relay 2, inlet air heating grid 3, circuit protection device 4 with
And smart electronics fan 5, in which:
The the first stitch X1 and the second stitch X2 of ECU1 is connected with the input circuit of inlet air heating relay 2, the first stitch
X1 and the second stitch X2 be inlet air heating relay 2 control stitch, by control inlet air heating relay 2 be opened or closed come
Whether control inlet air heating grid 3 works；The output loop first end of inlet air heating relay 2 passes through circuit protection device 4
It is connected with battery positive voltage, second end is connected with the first end of inlet air heating grid 3；The second end of inlet air heating grid 3 is grounded；
The common end A point of inlet air heating relay 2 and inlet air heating grid 3 is connected with the third stitch X3 of ECU1, and third stitch X3 is
The analog acquisition passage of ECU1；The 4th stitch X4 of ECU1 is connected with the PWM of smart electronics fan driving end, output control letter
Number control smart electronics fan 5 operate.
In the present embodiment, it should be noted that circuit protection device 4 is fuse, and the blowout current of fuse is z
Peace, wherein y+b < z < y-b+x-a, and, x+a < z recommends z selection in y+b+x/3 or so；The operating current of inlet air heating grid
For y peace ± b peace, the operating current of smart electronics fan 5 is x peace ± a peace, wherein when x represents smart electronics fan full speed operation
Rated current, rated current when y represents the work of inlet air heating grid, actual current when a represents smart electronics fan full speed operation
And rated current deviation maximum value, actual current and rated current deviation maximum value when b represents the work of inlet air heating grid, and send out
Both inlet air heating grid and smart electronics fan will not work at the same time under motivation normal operation.
It should be noted that in the present embodiment, the X1 stitch of ECU1 provides height for 2 input circuit of inlet air heating relay
Whether polygonal voltage, the second stitch X2 control 2 input circuit of inlet air heating relay are connected.If the second stitch X2 output state is 1,
The conducting of 2 input circuit of inlet air heating relay, then its output loop simultaneously turns on, and inlet air heating relay 2 passes through circuit at this time
Protective device 4 is connected with battery positive voltage, is heated.If the second stitch X2 output state is 0, inlet air heating relay 2 is defeated
Entry loop is not turned on, and inlet air heating grid 3 is without heating.The analog acquisition passage for being ECU1 for third stitch X3, when
When inlet air heating grid 3 works, A point is connected with battery positive voltage, i.e., voltage is accumulator positive pole tension, third stitch X3 acquisition
To high voltage (being greater than 4.5V)；If inlet air heating grid 3 does not work, A point voltage is less than 0.5V, and third stitch X3 acquires low electricity
Pressure.Whether Voltage Feedback mode in this way, ECU1 can be in heated condition with accurate judgement inlet air heating grid 3.
Specifically, the course of work of circuit disclosed in the present embodiment are as follows:
When inlet air heating relay the situations such as does not have to, is soaked with rain for a long time and occurs, inlet air heating may result in
Relay sticks together, and needs after the stitch T15 of ECU is powered on, and detects to whether inlet air heating relay sticks together.
If stitch T15 is powered on, the second stitch X2 output state is 0, then illustrates that inlet air heating relay is not heated, at this point, third
Stitch X3 monitors A point voltage, if A point voltage is greater than 4.5V, illustrates that inlet air heating relay sticks together；If A point voltage is less than
0.5V illustrates that relay does not stick together.In course of normal operation, heating time be less than 5s, inlet air heating grid to air inlet without
Heating effect, therefore, setting inlet air heating relay working time cannot be less than 5s.
(monitoring current environmental temperature, when current environmental temperature reaches preset temperature), air inlet in the case where reaching certain condition
Relay closure is heated, third stitch X3 monitors A point voltage, if A point voltage is less than 0.5V, illustrates that inlet air heating grid is in
Open-circuit condition can not carry out normal heating, report inlet air heating relay open-circuit fault.If monitoring A point voltage is greater than 4.5V, air inlet
Heater grid enters normal heating phases.
After heating, inlet air heating relay is disconnected, the second stitch X2 output 0, using predetermined time delay 500ms
(500ms is the delay time that inlet air heating relay can achieve stable operation working condition) afterwards, third stitch X3 acquires A point
Voltage, if inlet air heating relay does not stick together, A point voltage is less than 0.5V, and third stitch X3 collects low-voltage, failure report
Warning lamp is not alarmed；If inlet air heating relay sticks together, output loop conducting, inlet air heating grid is in heated condition, A
Point voltage is greater than 4.5V, and third stitch X3 acquires high voltage, trouble light alarm.After detecting adhesion, ECU controls the 4th stitch
X4 makes smart electronics fan full-speed operation, and the sum of inlet air heating grid electric current and smart electronics fan electrical current are greater than insurance at this time
Silk blowout current, disconnects heater circuit, and inlet air heating grid is no longer heated, while smart electronics fan no longer works, because
This, can burn to avoid route and cause economic loss and safety accident.
The invention discloses a kind of inlet air heating relay fault diagnosis and protection circuit, the present invention are single by electronic control
The mode of first ECU acquisition inlet air heating grid high side voltage, accurate judgement inlet air heating relay whether adhesion, when detection occurs
After inlet air heating relay adhesion, the 4th stitch X4 and the PWM of smart electronics fan the driving end of ECU is connected, control output control
Signal processed controls the full-speed operation of smart electronics fan, so that the sum of inlet air heating grid electric current and smart electronics fan electrical current are greater than
Fusting current introduces high current, actively disconnects inlet air heating grid power supply circuit, inlet air heating grid is no longer added
Heat, while smart electronics fan no longer works, it can thus be avoided route, which is burnt, causes economic loss and safety accident.
Embodiment two
Smart electronics fan is not controlled by ECU, and by other controllers (such as VCU, smart electronics fan governor
Deng) control the case where, after ECU detects that inlet air heating relay sticks together, by ECU issue control signal, other control
After device receives this control signal, smart electronics fan control signal is exported, makes smart electronics fan full-speed operation, fusing insurance
Silk disconnects heater circuit.
Attached drawing 2 is please referred to, Fig. 2 is another inlet air heating relay fault diagnosis provided in an embodiment of the present invention and protection
Circuit diagram.As shown in Fig. 2, other controller 6 is increased, specifically, as shown in Fig. 2, ECU on the basis of Fig. 1
The 4th stitch X4 be connected with the control unit of smart electronics fan 5 by CAN communication, output controls signal control smart electronics
Fan 5 operates.After ECU1 detects that inlet air heating relay 2 sticks together, control signal, other controllers are issued by ECU1
After 6 receive this control signal, output smart electronics fan 5 controls signal, makes 5 full-speed operation of smart electronics fan, and fusing is protected
Dangerous silk disconnects heater circuit, and inlet air heating grid is no longer heated, while smart electronics fan no longer works, therefore, equally
It can be burnt to avoid route and cause economic loss and safety accident.
The invention discloses a kind of inlet air heating relay fault diagnosis and protection circuit, the present invention are single by electronic control
The mode of first ECU acquisition inlet air heating grid high side voltage, accurate judgement inlet air heating relay whether adhesion, when detection occurs
After inlet air heating relay adhesion, the 4th stitch X4 of ECU is connected by CAN communication with the control unit of smart electronics fan,
Control output control signal controls the full-speed operation of smart electronics fan, so that inlet air heating grid electric current and smart electronics fan electricity
The sum of stream is greater than fusting current, introduces high current, actively disconnects inlet air heating grid power supply circuit, inlet air heating grid
It is no longer heated, while smart electronics fan no longer works, it can thus be avoided route, which is burnt, causes economic loss and peace
Full accident.
Attached drawing 3 is please referred to, Fig. 3 is a kind of inlet air heating relay fault diagnosis provided in an embodiment of the present invention and protection side
Method flow diagram.As shown in figure 3, the invention discloses a kind of inlet air heating relay fault diagnosis and guard method, application
In inlet air heating relay fault diagnosis circuit, inlet air heating relay fault diagnosis circuit include: electronic control unit ECU,
Inlet air heating relay, inlet air heating grid, circuit protection device and smart electronics fan, this method specifically include following step
It is rapid:
Whether S1, the output state for monitoring the second stitch of ECU are 0, if it is not, then into S2, if it is, ECU third
Stitch monitors the voltage of common end A point, into S5；
S2, monitoring current ambient environmental temperature monitor inlet air heating when current ambient environmental temperature reaches preset temperature
Can grid work normally；
Wherein, can monitoring inlet air heating grid work normally, and please refer to attached drawing 4, and Fig. 4 is provided in an embodiment of the present invention
The step flow chart that can monitoring inlet air heating grid work normally, which specifically may include as follows:
S21, control inlet air heating relay conducting, ECU third stitch monitor the voltage of common end A point.
Whether S22, the voltage for judging common end A point are high level.
S23, when common end A point voltage be less than 0.5V, i.e., the voltage of common end A point be low level, then inlet air heating after
Electric appliance is in open-circuit condition, reports inlet air heating relay open-circuit fault.
S24, when monitoring common end A point voltage be greater than 4.5V, i.e., the voltage of common end A point be high level, then air inlet adds
Heat grate works normally.
S3, when inlet air heating grid is normal operating conditions, and heating time reaches default heating time, ECU control
Second stitch output state is 0, disconnects inlet air heating relay；
It should be noted that have restriction for the heating time of relay, and when heating time is less than 5s, inlet air heating grid
To air inlet without heating effect, when heated between be greater than 5s when, inlet air heating grid just has heating effect to air inlet, therefore, set
The default heating time of inlet air heating relay is greater than 5s.
After S4, delay predetermined time delay, ECU third stitch monitors the voltage of common end A point；
Whether S5, the voltage for judging common end A point are high level, if so, into S6, if it is not, then trouble light is not alarmed；
S6, when the voltage of common end A point is greater than 4.5V, i.e. the voltage of common end A point is high level, then inlet air heating relay
Device sticks together, and reports inlet air heating relay adhesion fault；
It should be noted that when common end A point voltage be less than 0.5V, i.e., the voltage of common end A point be low level, then into
Gas heating relay does not stick together.
The 4th stitch output control signal of S7, ECU, control the full speed running of smart electronics fan, inlet air heating grid electricity
The sum of stream and smart electronics fan electrical current are greater than the electric current of circuit protection device, then disconnecting circuit protective device.
Preferably, attached drawing 5 is referred to, Fig. 5 is a kind of inlet air heating relay fault diagnosis provided in an embodiment of the present invention
The further flow chart of method.As shown in figure 5, this method on the basis of above-mentioned steps, can also include the following steps:
S8, the voltage for monitoring common end A point；
S9, when the voltage of common end A point is less than 0.5V, then circuit protection device disconnects, inlet air heating grid and intelligence
Electronic fan stops working.
Specifically, the course of work of circuit disclosed in the present embodiment are as follows:
When inlet air heating relay the situations such as does not have to, is soaked with rain for a long time and occurs, inlet air heating may result in
Relay sticks together, and needs after the stitch T15 of ECU is powered on, and detects to whether inlet air heating relay sticks together.
If stitch T15 is powered on, the second stitch X2 output state is 0, then illustrates that inlet air heating relay is not heated, at this point, third
Stitch X3 monitors A point voltage, if A point voltage is greater than 4.5V, illustrates that inlet air heating relay sticks together；If A point voltage is less than
0.5V illustrates that relay does not stick together.In course of normal operation, heating time be less than 5s, inlet air heating grid to air inlet without
Heating effect, therefore, setting inlet air heating relay working time cannot be less than 5s.
(monitoring current environmental temperature, when current environmental temperature reaches preset temperature), air inlet in the case where reaching certain condition
Relay closure is heated, third stitch X3 monitors A point voltage, if A point voltage is less than 0.5V, illustrates that inlet air heating grid is in
Open-circuit condition can not carry out normal heating, report inlet air heating relay open-circuit fault.If monitoring A point voltage is greater than 4.5V, air inlet
Heater grid enters normal heating phases.
After heating, inlet air heating relay is disconnected, the second stitch X2 output 0, using predetermined time delay 500ms
(500ms is the delay time that inlet air heating relay can achieve stable operation working condition) afterwards, third stitch X3 acquires A point
Voltage, if inlet air heating relay does not stick together, A point voltage is less than 0.5V, and third stitch X3 collects low-voltage, failure report
Warning lamp is not alarmed；If inlet air heating relay sticks together, output loop conducting, inlet air heating grid is in heated condition, A
Point voltage is greater than 4.5V, and third stitch X3 acquires high voltage, trouble light alarm.After detecting adhesion, ECU controls the 4th stitch
X4 makes smart electronics fan full-speed operation, and the sum of inlet air heating grid electric current and smart electronics fan electrical current are greater than insurance at this time
Silk blowout current, disconnects heater circuit, and inlet air heating grid is no longer heated, while smart electronics fan no longer works, because
This, can burn to avoid route and cause economic loss and safety accident.
The invention discloses a kind of inlet air heating relay fault diagnosis and protection system, the present invention are single by electronic control
The mode of first ECU acquisition inlet air heating grid high side voltage, accurate judgement inlet air heating relay whether adhesion, when detection occurs
After inlet air heating relay adhesion, the 4th stitch X4 of ECU is connected with smart electronics fan, and control output control signal controls intelligence
Energy electronic fan full-speed operation, so that the sum of inlet air heating grid electric current and smart electronics fan electrical current are greater than blown fuse electricity
Stream introduces high current, actively disconnects inlet air heating grid power supply circuit, and inlet air heating grid is no longer heated, while intelligence
Electronic fan no longer works, it can thus be avoided route, which is burnt, causes economic loss and safety accident.
Attached drawing 6 is please referred to, Fig. 6 is a kind of inlet air heating relay fault diagnosis provided in an embodiment of the present invention and protection system
System structural schematic diagram.As shown in fig. 6, this is the invention discloses a kind of inlet air heating relay fault diagnosis and protection system
System specific structure include:
First monitoring unit 61, whether the output state for monitoring the second stitch of ECU is 0；
Second detection unit 62, for monitoring current ambient environmental temperature, when current ambient environmental temperature reaches default temperature
When spending, can monitoring inlet air heating grid be worked normally；
First switching units 63 are used to when inlet air heating grid be normal operating conditions, and heating time reaches default add
When the hot time, it is 0 that ECU, which controls the second stitch output state, disconnects inlet air heating relay；
Third monitoring unit 64, after postponing predetermined time delay, ECU third stitch monitors the voltage of common end A point；
First judging unit 65, for judging whether the voltage of common end A point is high level；
Alarm unit 66 is greater than 4.5V for the voltage when common end A point, i.e. the voltage of common end A point is high level, then
Inlet air heating relay sticks together, and reports inlet air heating relay adhesion fault；
Second switching units 67, for the 4th stitch output control signal of ECU, control smart electronics fan is transported at full speed
Row, the sum of inlet air heating grid electric current and smart electronics fan electrical current are greater than the electric current of circuit protection device, then disconnecting circuit is protected
Protection unit.
Attached drawing 7 is specifically please referred to, Fig. 7 is the structural schematic diagram of the second monitoring unit in the embodiment of the present invention；Such as Fig. 7 institute
Show, the second monitoring unit 62 includes:
Subelement 71 is monitored, for controlling the conducting of inlet air heating relay, ECU third stitch monitors the electricity of common end A point
Pressure；
Second judgment unit 72 judges whether the voltage of common end A point is high level；
When the voltage of common end A point is less than 0.5V, i.e. the voltage of common end A point is low level, then inlet air heating relay
In open-circuit condition, inlet air heating relay open-circuit fault is reported；
When the voltage of monitoring common end A point is greater than 4.5V, i.e. the voltage of common end A point is high level, then inlet air heating lattice
Grid work normally.
Preferably, attached drawing 8 is please referred to, Fig. 8 is a kind of inlet air heating relay fault diagnosis provided in an embodiment of the present invention
The further structural schematic diagram of system.As shown in figure 8, on the basis of above-mentioned Fig. 6, which can also include:
4th monitoring unit 68, for monitoring the voltage of common end A point；
Third switching units 69, for when the voltage of common end A point be less than 0.5V when, then circuit protection device disconnect, into
Gas heater grid and smart electronics fan stop working.
The invention discloses a kind of inlet air heating relay fault diagnosis and protection system, the present invention are single by electronic control
The mode of first ECU acquisition inlet air heating grid high side voltage, accurate judgement inlet air heating relay whether adhesion, when detection occurs
After inlet air heating relay adhesion, the 4th stitch X4 of ECU is connected with smart electronics fan, and control output control signal controls intelligence
Energy electronic fan full-speed operation, so that the sum of inlet air heating grid electric current and smart electronics fan electrical current are greater than blown fuse electricity
Stream introduces high current, actively disconnects inlet air heating grid power supply circuit, and inlet air heating grid is no longer heated, while intelligence
Electronic fan no longer works, it can thus be avoided route, which is burnt, causes economic loss and safety accident.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion so that article or equipment including a series of elements not only include those elements, but also is wrapped
Other elements that are not explicitly listed are included, or further include for this article or the intrinsic element of equipment.Do not having more
In the case where more limitations, the element that is limited by sentence "including a ...", it is not excluded that include above-mentioned element article or
There is also other identical elements in person's equipment.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of inlet air heating relay fault diagnosis and protection circuit characterized by comprising ECU, inlet air heating relay
Device, inlet air heating grid, circuit protection device and smart electronics fan, in which:
The first stitch and the second stitch of the ECU is connected with the input circuit of the inlet air heating relay, first needle
Foot and second stitch are that the inlet air heating relay controls stitch, by controlling the open-minded of the inlet air heating relay
Or it closes to control whether the inlet air heating grid works；
The output loop first end of the inlet air heating relay is connected by the circuit protection device with battery positive voltage, the
Two ends are connected with the first end of the inlet air heating grid；
The second end of the inlet air heating grid is grounded；
The common end A point of the inlet air heating relay and the inlet air heating grid is connected with the third stitch of the ECU, institute
State the analog acquisition passage that third stitch is the ECU；
The 4th stitch of the ECU is connected with the smart electronics fan, and output control signal controls the smart electronics fan
Operating；
When the second stitch output state of the ECU is 1, the input circuit of the inlet air heating relay is connected, then it is exported
Circuit simultaneously turns on, and the inlet air heating relay is connected with the battery positive voltage at this time, is heated；When the ECU's
Second stitch output state be 0, the input circuit of the inlet air heating relay is not turned on, the inlet air heating grid without
Heating；The analog acquisition passage that third stitch for the ECU is the ECU, when inlet air heating grid work,
The common end A point is connected with the battery positive voltage, i.e., voltage is the accumulator positive pole tension, the third needle of the ECU
Foot collects high voltage；If the inlet air heating grid does not work, the third stitch of the ECU acquires low-voltage, passes through electricity
Pressure feedback system judges whether the inlet air heating grid is in heated condition；
After heating, the inlet air heating relay is disconnected, and the second stitch output state of the ECU is 0, using pre-
If the third stitch X3 of the ECU acquires common end A point voltage after delay time, if the inlet air heating relay occurs to glue
Even, output loop conducting, the inlet air heating grid are in heated condition, and the common end A point voltage is high level, described
The third stitch X3 of ECU acquires high voltage, trouble light alarm；After detecting adhesion, the ECU controls the 4th stitch,
Make the smart electronics fan full-speed operation, so that the electric current of the electric current of the inlet air heating grid and the smart electronics fan
The sum of be greater than the electric current of the circuit protection device, disconnect heater circuit, the inlet air heating grid no longer heated, simultaneously
The smart electronics fan no longer works.
2. inlet air heating relay fault diagnosis according to claim 1 and protection circuit, which is characterized in that the ECU
The PWM driving end of the 4th stitch and the smart electronics fan be connected, the output control signal control smart electronics fan
Operating.
3. inlet air heating relay fault diagnosis according to claim 1 and protection circuit, which is characterized in that the ECU
The 4th stitch be connected with the control unit of the smart electronics fan by CAN communication, output controls the signal control intelligence
It can electronic fan operating.
4. inlet air heating relay fault diagnosis according to claim 1 and protection circuit, which is characterized in that the circuit
Protective device is fuse.
5. a kind of inlet air heating relay fault diagnosis and guard method, which is characterized in that it is any one to be applied to claim 1-4
Inlet air heating relay fault diagnosis and protection circuit described in, this method comprises:
Whether S1, the output state for monitoring second stitch of ECU are 0, if it is not, then into S2, if it is, the ECU
Third stitch monitors the voltage of the common end A point, into S5；
S2, monitoring current ambient environmental temperature monitor the air inlet when the current ambient environmental temperature reaches preset temperature
Can heater grid work normally；
S3, when the inlet air heating grid is normal operating conditions, and heating time reaches default heating time, the ECU
Controlling the second stitch output state is 0, disconnects the inlet air heating relay；
After S4, delay predetermined time delay, the ECU third stitch monitors the voltage of the common end A point；
Whether S5, the voltage for judging the common end A point are high level, if so, into S6, if it is not, then trouble light is not alarmed；
S6, when the voltage for monitoring the common end A point is high level, then the inlet air heating relay sticks together, described in report
Inlet air heating relay adhesion fault；
The 4th stitch output control signal of S7, the ECU, control the smart electronics fan full speed running, the air inlet adds
The sum of hot grid electric current and the smart electronics fan electrical current are greater than the electric current of the circuit protection device, then disconnect the circuit
Protective device.
6. inlet air heating relay fault diagnosis according to claim 5 and guard method, which is characterized in that the monitoring
Can the inlet air heating grid work normally, comprising:
S21, the control inlet air heating relay conducting, the ECU third stitch monitor the voltage of the common end A point；
Whether S22, the voltage for judging the common end A point are high level；
S23, when the voltage for monitoring the common end A point is low level, then the inlet air heating grid is in open-circuit condition, reports institute
State inlet air heating grid open-circuit fault；
S24, when the voltage for monitoring the common end A point is high level, then the inlet air heating grid works normally.
7. inlet air heating relay fault diagnosis according to claim 5 and guard method, which is characterized in that further include:
Monitor the voltage of the common end A point；
When the voltage of the common end A point is low level, then the circuit protection device disconnects, the inlet air heating grid and
The smart electronics fan stops working.
8. a kind of inlet air heating relay fault diagnosis and protection system, which is characterized in that it is any one to be applied to claim 1-4
Inlet air heating relay fault diagnosis and protection circuit, the system described in include:
First monitoring unit, whether the output state for monitoring second stitch of ECU is 0；
Second detection unit, for monitoring current ambient environmental temperature, when the current ambient environmental temperature reaches preset temperature
When, can monitor the inlet air heating grid work normally；
First switching units, for being normal operating conditions when the inlet air heating grid, and heating time reaches default heating
When the time, it is 0 that the ECU, which controls the second stitch output state, disconnects the inlet air heating relay；
Third monitoring unit, after postponing predetermined time delay, the ECU third stitch monitors the electricity of the common end A point
Pressure；
First judging unit, for judging whether the voltage of the common end A point is high level；
Alarm unit, for being high level when the voltage for monitoring the common end A point, then the inlet air heating relay occurs viscous
Even, the inlet air heating relay adhesion fault is reported；
Second switching units control the smart electronics fan and transport at full speed for the 4th stitch output control signal of the ECU
Row, the sum of the inlet air heating grid electric current and the smart electronics fan electrical current are greater than the electric current of the circuit protection device,
Then disconnect the circuit protection device.
9. inlet air heating relay fault diagnosis according to claim 8 and protection system, which is characterized in that described second
Detection unit includes:
Subelement is monitored, for controlling the inlet air heating relay conducting, the ECU third stitch monitors the common end A
The voltage of point；
Second judgment unit judges whether the voltage of the common end A point is high level；
When the voltage for monitoring the common end A point is low level, then the inlet air heating relay is in open-circuit condition, described in report
Inlet air heating relay open-circuit fault；
When the voltage for monitoring the common end A point is high level, then the inlet air heating grid works normally.
10. inlet air heating relay fault diagnosis according to claim 8 and protection system, which is characterized in that further include:
4th monitoring unit, for monitoring the voltage of the common end A point；
Third switching units, for when the voltage of the common end A point is low level, then the circuit protection device to disconnect,
The inlet air heating grid and the smart electronics fan stop working.
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| CN201710764285.XA CN107359598B (en) | 2017-08-30 | 2017-08-30 | A kind of inlet air heating relay fault diagnosis and protection circuit, method and system |
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| CN201710764285.XA CN107359598B (en) | 2017-08-30 | 2017-08-30 | A kind of inlet air heating relay fault diagnosis and protection circuit, method and system |
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| CN109545619A (en) * | 2018-12-30 | 2019-03-29 | 安徽华成电子科技有限公司 | High current hybrid relay |
| CN114108240B (en) * | 2020-08-27 | 2023-03-07 | 无锡小天鹅电器有限公司 | Heating control method and device, clothes treatment equipment and storage medium |
| CN112993961B (en) * | 2021-03-18 | 2022-11-01 | 东莞永胜医疗制品有限公司 | Heating circuit protection circuit, breathing heating circuit and breathing auxiliary equipment |
| CN113917322A (en) * | 2021-09-15 | 2022-01-11 | 潍柴动力股份有限公司 | Fault detection method of air inlet heating relay and related device |
| CN114582670B (en) * | 2022-03-07 | 2024-05-17 | 潍柴动力股份有限公司 | Method and system for judging ageing of relay and preventing grid from being overheated |
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