CN108547694B - Detection method, detection device and detection system of electromagnetic fan - Google Patents
Detection method, detection device and detection system of electromagnetic fan Download PDFInfo
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- CN108547694B CN108547694B CN201810293175.4A CN201810293175A CN108547694B CN 108547694 B CN108547694 B CN 108547694B CN 201810293175 A CN201810293175 A CN 201810293175A CN 108547694 B CN108547694 B CN 108547694B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/02—Controlling of coolant flow the coolant being cooling-air
- F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
- F01P7/048—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio using electrical drives
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a detection method, a detection device and a detection system of an electromagnetic fan, which are applied to a control system of the electromagnetic fan, wherein the control system of the electromagnetic fan comprises the electromagnetic fan, an electronic control unit and an engine, and the detection method comprises the following steps: when the electronic control unit is electrified, the opening of an accelerator is 0 and the speed of a vehicle is 0, controlling an electromagnetic fan to be adjusted to a first rotating speed mode and obtain a first engine torque of the engine, and then controlling the electromagnetic fan to be adjusted to a second rotating speed mode and obtain a second engine torque of the engine, wherein a preset rotating speed value in the first rotating speed mode is smaller than a preset rotating speed value in the second rotating speed mode; and if the first engine torque is detected to be larger than the second engine torque, judging that the electromagnetic clutch plugging state of the electromagnetic fan is abnormal. According to the embodiment of the invention, the detection of the electromagnetic fan is realized, the abnormal condition of the electromagnetic clutch plugging state of the electromagnetic fan can be found in time, and the normal operation of the vehicle cooling system is further ensured.
Description
Technical Field
The embodiment of the invention relates to the technology of controlling an electromagnetic fan of an engine, in particular to a detection method, a detection device and a detection system of the electromagnetic fan.
Background
Electromagnetic fans are widely used in vehicle cooling systems.
The existing common electromagnetic fan is usually a three-speed electromagnetic fan, i.e. there are three states of low speed, medium speed and high speed. An electromagnetic fan system is usually provided with an electromagnetic clutch, and the electromagnetic clutch is electrically connected with two relays respectively, wherein one of the two relays is used for controlling the electromagnetic clutch so as to enable the electromagnetic fan to operate at a medium speed, and the other relay is used for controlling the electromagnetic clutch so as to enable the electromagnetic fan to operate at a high speed. The engine electronic control unit is respectively electrically connected with the two relays through the two control pins through the connectors, and the two control pins are used for sending on-off signals, so that the on-off states of the two relays are controlled to control the clutch state of the electromagnetic clutch, and the electromagnetic fan is enabled to run at a certain rotating speed.
However, in the actual production process, the relay for controlling the electromagnetic fan to operate at a medium speed and the relay for controlling the electromagnetic fan to operate at a high speed may be connected to the corresponding control pins in an opposite manner, so that the electromagnetic fan may not operate normally, and the electronic control unit may not detect the above conditions, thereby adversely affecting the vehicle heat dissipation system.
Disclosure of Invention
The invention provides a detection method, a detection device and a detection system of an electromagnetic fan, which are used for realizing the detection of the electromagnetic fan and timely finding out the abnormal operation condition of the electromagnetic fan.
In a first aspect, an embodiment of the present invention provides a detection method for an electromagnetic fan, where the detection method is applied to a control system for an electromagnetic fan, the control system for an electromagnetic fan includes the electromagnetic fan, an electronic control unit, and an engine, and the detection method includes:
when the electronic control unit is electrified, the opening of an accelerator is 0 and the speed of a vehicle is 0, controlling an electromagnetic fan to be adjusted to a first rotating speed mode and obtain a first engine torque of the engine, and then controlling the electromagnetic fan to be adjusted to a second rotating speed mode and obtain a second engine torque of the engine, wherein a preset rotating speed value in the first rotating speed mode is smaller than a preset rotating speed value in the second rotating speed mode;
and if the first engine torque is detected to be larger than the second engine torque, judging that the electromagnetic clutch plugging state of the electromagnetic fan is abnormal.
The control system of the electromagnetic fan further comprises a first relay and a second relay, and the electronic control unit comprises a first control port and a second control port;
the specific implementation process for controlling the electromagnetic fan to be adjusted to the first rotating speed mode comprises the following steps: sending a first conduction instruction to a first relay electrically connected with the first control port through the first control port so as to enable the electromagnetic fan to operate according to a first rotating speed mode;
the specific execution process for controlling the electromagnetic fan to be adjusted to the second rotating speed mode comprises the following steps: and sending a second conduction instruction to a second relay electrically connected with the second control port through the second control port so as to enable the electromagnetic fan to operate according to a second rotating speed mode.
Wherein, after judging electromagnetic clutch plug-in state of electromagnetic fan is unusual, still include:
sending a second conduction instruction to the first relay through the first control port so that the electromagnetic fan operates according to a second rotating speed mode; and sending a first conduction instruction to the second relay through the second control port so as to enable the electromagnetic fan to operate according to the first rotating speed mode.
Wherein, after judging electromagnetic clutch plug-in state of electromagnetic fan is unusual, still include:
and if the difference value of the first engine torque and the second engine torque is smaller than the engine torque threshold value, judging that the electromagnetic clutch coil has a fault, and outputting a prompt for checking the working condition of the electromagnetic clutch coil.
Wherein, the detection method also comprises the following steps:
and if the first engine torque is smaller than the second engine torque, judging that the electromagnetic clutch plugging state of the electromagnetic fan is normal.
Before detecting that the electronic control unit is electrified, the accelerator opening is 0 and the vehicle speed is 0, the method further comprises the following steps:
detecting whether a connection path between the first relay and the first control port and a connection path between the second relay and the second control port have a short-circuit fault or an open-circuit fault;
and if the situation that the open circuit fault or the short circuit fault does not exist in the connection path between the first relay and the first control port and the connection path between the second relay and the second control port is detected, controlling to continuously execute the detection process of the electromagnetic fan.
If the connection path between the first relay and the first control port and/or the connection path between the second relay and the second control port is detected to have open-circuit fault or short-circuit fault, controlling to report the fault of the connection path between the first relay and the first control port and/or the fault of the connection path between the second relay and the second control port, and controlling to quit the detection process of the electromagnetic fan.
Before controlling the electromagnetic fan to adjust to the first rotating speed mode and obtaining the first engine torque of the engine, the method further comprises the following steps:
and detecting whether the electronic control unit receives a trigger instruction for detecting the electromagnetic fan, and if so, controlling to continue to execute the detection process of the electromagnetic fan.
In a second aspect, an embodiment of the present invention further provides a detection apparatus for an electromagnetic fan, where the detection apparatus is applied to a control system for the electromagnetic fan, the control system for the electromagnetic fan includes the electromagnetic fan, an electronic control unit, and an engine, and the detection apparatus includes:
the control module is used for controlling the electromagnetic fan to be adjusted to a first rotating speed mode and acquiring a first engine torque of the engine and then controlling the electromagnetic fan to be adjusted to a second rotating speed mode and acquiring a second engine torque of the engine when the electronic control unit is detected to be powered on, the accelerator opening is 0 and the vehicle speed is 0, wherein a preset rotating speed value in the first rotating speed mode is smaller than a preset rotating speed value in the second rotating speed mode;
and the judging module is used for judging that the electromagnetic clutch plugging state of the electromagnetic fan is abnormal if the first engine torque is detected to be larger than the second engine torque.
The control system of the electromagnetic fan further comprises a first relay and a second relay, and the electronic control unit comprises a first control port and a second control port;
the control module is used for sending a first conduction instruction to a first relay electrically connected with the first control port through the first control port so as to enable the electromagnetic fan to operate according to a first rotating speed mode, and is also used for sending a second conduction instruction to a second relay electrically connected with the second control port through the second control port so as to enable the electromagnetic fan to operate according to a second rotating speed mode.
Wherein, this detection device still includes: and the correction module is used for sending a second conduction instruction to the first relay through the first control port so as to enable the electromagnetic fan to operate according to the second rotating speed mode after judging that the plugging state of the electromagnetic clutch of the electromagnetic fan is abnormal, and sending a first conduction instruction to the second relay through the second control port so as to enable the electromagnetic fan to operate according to the first rotating speed mode.
Wherein, this detection device still includes: and the clutch coil fault judging module is used for judging the fault of the clutch coil and outputting a prompt for checking the working condition of the clutch coil if the difference value of the first engine torque and the second engine torque is smaller than the engine torque threshold value after judging that the electromagnetic clutch plugging state of the electromagnetic fan is abnormal.
The determination module is further used for determining that the electromagnetic clutch plugging state of the electromagnetic fan is normal if the first engine torque is smaller than the second engine torque.
Wherein, this detection device still includes: the circuit fault detection module is used for detecting whether a connection path between the first relay and the first control port and a connection path between the second relay and the second control port have a short-circuit fault or a broken-circuit fault before detecting that the electronic control unit is electrified, the opening of the accelerator is 0 and the vehicle speed is 0;
and if the situation that the open circuit fault or the short circuit fault does not exist in the connection path between the first relay and the first control port and the connection path between the second relay and the second control port is detected, controlling to continuously execute the detection process of the electromagnetic fan.
The circuit fault detection module is further used for controlling to report errors of faults existing in a connection path between the first relay and the first control port and/or a connection path between the second relay and the second control port and controlling to quit a detection process of the electromagnetic fan if the connection path between the first relay and the first control port and/or the connection path between the second relay and the second control port is detected to have a disconnection fault or a short-circuit fault.
The detection device further comprises a trigger detection module, which is used for detecting whether the electronic control unit receives a trigger instruction for detecting the electromagnetic fan before controlling the electromagnetic fan to be adjusted to the first rotating speed mode and acquiring the first engine torque of the engine, and if so, controlling to continue executing the detection process of the electromagnetic fan.
In a third aspect, an embodiment of the present invention further provides a detection system for an electromagnetic fan, including the detection apparatus for an electromagnetic fan provided in the second aspect, an electronic control unit, an electromagnetic fan, and an engine.
Wherein the detection device of the electromagnetic fan is integrated in the electronic control unit.
The embodiment of the invention provides a detection method, a detection device and a detection system of an electromagnetic fan, wherein after an electronic control unit is powered on, the electromagnetic fan is controlled to be adjusted to a first rotating speed mode and obtain a first engine torque of an engine under the conditions that the opening degree of an accelerator is 0 and the speed is 0, namely no other load exists, and then the electromagnetic fan is controlled to be adjusted to a second rotating speed mode and obtain a second engine torque of the engine, wherein the preset rotating speed value in the first rotating speed mode is smaller than the preset rotating speed value in the second rotating speed mode, so that under the condition that the connection state of an electromagnetic fan control system is normal, the power required when the electromagnetic fan operates in the first rotating speed mode is smaller than the power required when the electromagnetic fan operates in the second rotating speed mode, namely the first engine torque is smaller than the second engine torque. It is possible to determine that the electromagnetic clutch engagement state of the electromagnetic fan is abnormal if it is detected that the first engine torque is larger than the second engine torque. The embodiment of the invention solves the problem that the electronic control unit in the prior art cannot detect that the relay for controlling the medium-speed running of the electromagnetic fan and the relay for controlling the high-speed running of the electromagnetic fan are reversely connected with the corresponding control pins, thereby generating adverse effect on a vehicle cooling system, realizing the detection of the electromagnetic fan, finding the abnormal condition of the connection state of the electromagnetic clutch of the electromagnetic fan in time, and further ensuring the normal running of the vehicle cooling system.
Drawings
Fig. 1 is a flowchart of a detection method of an electromagnetic fan according to an embodiment of the present invention.
Fig. 2 is a flowchart of a detection method of an electromagnetic fan according to a second embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a detecting device of an electromagnetic fan according to a third embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a detecting apparatus of an electromagnetic fan according to a fourth embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a detection system of an electromagnetic fan according to a fifth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a detection method for an electromagnetic fan according to an embodiment of the present invention, where the detection method is applicable to a situation of detecting the electromagnetic fan, and the detection method can be executed by a detection apparatus for the electromagnetic fan, and is applied to a control system for the electromagnetic fan, where the control system for the electromagnetic fan includes the electromagnetic fan, an electronic control unit, and an engine, and the detection method includes:
specifically, the electromagnetic fan includes an electromagnetic clutch inside, and when the electromagnetic fan operates in the first rotation speed mode and the second rotation speed mode, the contact state of the electromagnetic clutch is different. For the existing electromagnetic fan, three operation modes of low speed, medium speed and high speed are generally included, for example, the first rotation speed mode may be a medium speed operation mode of the electromagnetic fan, and the second rotation speed mode may be a high speed operation mode of the electromagnetic fan. When the electronic control unit is electrified, the accelerator opening is 0 and the vehicle speed is 0, the electronic control unit is in a working state and the current vehicle state is not loaded, and under the condition, the engine can be started to run at an idle speed for a period of time, so that the engine enters a stable state, and errors are reduced. The specific time of the idle running can be preset, for example, a first time threshold of the idle running is set, when the time of the idle running of the engine at least reaches the first time threshold, the electromagnetic fan is controlled to be adjusted to a first rotating speed mode, that is, only one load of the electromagnetic fan of the vehicle is running at the moment, and a first engine torque of the engine is obtained; and then when the electronic control unit is powered on, the opening of the accelerator is 0 and the vehicle speed is 0, controlling the electromagnetic fan to adjust to a second rotating speed mode and acquiring a second engine torque of the engine. The preset rotating speed value in the first rotating speed mode is smaller than the preset rotating speed value in the second rotating speed mode, namely, under the condition that the wiring of the electromagnetic fan control system is normal, the rotating speed of the electromagnetic fan in the first rotating speed mode is smaller than the rotating speed of the electromagnetic fan in the second rotating speed mode, so that the power required by the electromagnetic fan in the first rotating speed mode is smaller than the power required by the electromagnetic fan in the second rotating speed mode, namely, the first engine torque is smaller than the second engine torque.
And step 120, if the first engine torque is detected to be larger than the second engine torque, judging that the electromagnetic clutch plugging state of the electromagnetic fan is abnormal.
Illustratively, when detecting that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, the first engine torque obtained after controlling the electromagnetic fan to adjust to the first rotation speed mode is Trq1, the second engine obtained after controlling the electromagnetic fan to adjust to the second rotation speed mode is Trq2, if Trq1> Trq2, it is described that the power required when the electromagnetic fan operates in the first rotation speed mode is larger than the power when the electromagnetic fan operates in the second rotation speed mode, and under the conditions that the electronic control unit is powered on, the accelerator opening is 0 and the vehicle speed is 0, the vehicle has no other load except the electromagnetic fan, so if Trq1> Trq2, it is described that the rotation speed of the electromagnetic fan in the first rotation speed mode is larger than the rotation speed of the electromagnetic fan in the second rotation speed mode, and when the electromagnetic fan plugging state is normal, the condition that the preset rotation speed value in the first rotation speed mode is smaller than the preset rotation speed value in the second rotation speed mode does not conform to the electromagnetic clutch, therefore, when Trq1> Trq2, it can be determined that the clutch state is abnormal. Alternatively, if it is detected that the first engine torque is equal to the second engine torque, it is also determined that the electromagnetic clutch engagement state of the electromagnetic fan is abnormal. According to the technical scheme, on the basis of not changing the existing whole vehicle connection structure, whether the plugging state of the electromagnetic fan clutch is normal or not can be judged through the magnitude relation between the first engine torque of the electromagnetic fan in the first rotating speed mode and the second engine torque of the electromagnetic fan in the second rotating speed mode, and the abnormal condition of the plugging state of the electromagnetic clutch of the electromagnetic fan can be found in time.
On the basis of the above scheme, optionally, the detection method further includes:
and step 121, if the first engine torque is smaller than the second engine torque, determining that the electromagnetic clutch plugging state of the electromagnetic fan is normal.
Specifically, when the electronic control unit is powered on, the accelerator opening is 0 and the vehicle speed is 0, a first engine torque of the engine when the electromagnetic fan is in the first rotation speed mode is smaller than a second engine torque of the engine when the electromagnetic fan is in the second rotation speed mode, that is, the rotation speed of the electromagnetic fan in the first rotation speed mode is smaller than the rotation speed of the electromagnetic fan in the second rotation speed mode, and the predetermined condition is met, so that the normal plugging state of the electromagnetic clutch of the electromagnetic fan can be determined.
On the basis of the above scheme, optionally, before controlling the electromagnetic fan to adjust to the first rotation speed mode and obtaining the first engine torque of the engine, the method further includes:
The electromagnetic fan is detected every time the engine is started, so that the aging speed of a control system of the electromagnetic fan is accelerated, and the detection mode of the electromagnetic fan can be set as trigger detection, namely, only when the electronic control unit receives a trigger instruction for detecting the electromagnetic fan, the detection flow of the electromagnetic fan is controlled and executed. For example, the triggering instruction for detecting the electromagnetic fan may be set such that the electronic control unit receives that the accelerator pedal is continuously pressed-released 4 times within a second preset time (e.g., within 5 s), and then after the electronic control unit detects the triggering instruction, the electronic control unit controls to continue to execute the detection process for the electromagnetic fan, so as to avoid a problem that the control system is too fast in aging due to too frequent detection of the electromagnetic fan.
The embodiment provides a method for detecting an electromagnetic fan, which includes after an electronic control unit is powered on, controlling the electromagnetic fan to adjust to a first rotation speed mode and obtain a first engine torque of an engine under the condition that an accelerator opening is 0 and a vehicle speed is 0, that is, no other load exists, and then controlling the electromagnetic fan to adjust to a second rotation speed mode and obtain a second engine torque of the engine, wherein a preset rotation speed value in the first rotation speed mode is smaller than a preset rotation speed value in the second rotation speed mode, so that under the condition that a connection state of an electromagnetic fan control system is normal, power required when the electromagnetic fan operates in the first rotation speed mode should be smaller than power required when the electromagnetic fan operates in the second rotation speed mode, that is, the first engine torque should be smaller than the second engine torque. It is possible to determine that the electromagnetic clutch engagement state of the electromagnetic fan is abnormal if it is detected that the first engine torque is larger than the second engine torque. The embodiment of the invention solves the problem that the electronic control unit in the prior art cannot detect that the relay for controlling the medium-speed running of the electromagnetic fan and the relay for controlling the high-speed running of the electromagnetic fan are reversely connected with the corresponding control pins, thereby generating adverse effect on a vehicle cooling system, realizing the detection of the electromagnetic fan, finding the abnormal condition of the connection state of the electromagnetic clutch of the electromagnetic fan in time, and further ensuring the normal running of the vehicle cooling system.
Example two
Fig. 2 is a flowchart of a detection method of an electromagnetic fan according to a second embodiment of the present invention, and the present embodiment further provides an optional detection method of an electromagnetic fan on the basis of the first embodiment.
Optionally, the control system of the electromagnetic fan further includes a first relay and a second relay, and the electronic control unit includes a first control port and a second control port;
in step 110, the specific execution process of controlling the electromagnetic fan to adjust to the first rotation speed mode is as follows:
sending a first conduction instruction to a first relay electrically connected with the first control port through the first control port so as to enable the electromagnetic fan to operate according to a first rotating speed mode;
in step 110, the specific execution process of controlling the electromagnetic fan to adjust to the second rotation speed mode is as follows:
and sending a second conduction instruction to a second relay electrically connected with the second control port through the second control port so as to enable the electromagnetic fan to operate according to a second rotating speed mode.
The on-off state of the first relay and the second relay determines the contact degree of an electromagnetic clutch of the electromagnetic fan, and further determines the operation mode of the electromagnetic fan. Under the condition that the wiring of a control system of the electromagnetic fan is normal, a first relay electrically connected with the first control port is switched on, and when a second relay electrically connected with the second control port is switched off, the electromagnetic fan operates according to a first rotating speed mode; when a second relay electrically connected with the second control port is turned on, the electromagnetic fan operates in the second rotation speed mode, and at this time, the electromagnetic fan operates in the second rotation speed mode regardless of whether the first relay electrically connected with the first control port is in an on or off state. Optionally, the first rotation speed mode is a medium-speed operation mode of the electromagnetic fan, and the second rotation speed mode is a high-speed operation mode of the electromagnetic fan. When the electromagnetic fan is controlled to be adjusted to the first rotating speed mode, a conduction instruction is sent to a first relay electrically connected with the electromagnetic fan through a first control port, so that the first relay is conducted; and when the electromagnetic fan is controlled to be adjusted to the second rotating speed mode, a conduction instruction is sent to a second relay electrically connected with the electromagnetic fan through a second control port, so that the second relay is conducted.
Specifically, the control system of the electromagnetic fan further comprises a first engine wiring harness electrically connected with the first control port, a second engine wiring harness electrically connected with the second control port, a first finished vehicle wiring harness electrically connected with the first relay, and a second finished vehicle wiring harness electrically connected with the second relay, wherein the engine wiring harness and the finished vehicle wiring harness are electrically connected through a connector. The connector comprises a male head and a female head, and in order to prevent wrong connection, the connector of a first engine wiring harness electrically connected with a first control port and the connector of a whole vehicle wiring harness electrically connected with a relay which enables the electromagnetic fan to operate in a first rotating speed mode under the condition of conduction are generally made into the male head and the female head with the same model so as to be matched with each other; and a connector of a second engine wiring harness electrically connected with the second control port and a connector of a whole vehicle wiring harness electrically connected with a relay which enables the electromagnetic fan to operate in the second rotating speed mode under the conduction condition are made into a male head and a female head with the same model so as to be matched with each other. However, in an actual production process, a situation opposite to the above situation often occurs due to carelessness of a production worker, and the like, and causes an abnormal situation in which the worker electrically connects the first control port and the relay which operates the electromagnetic fan in the second rotation speed mode in a conduction state, and electrically connects the second control port and the relay which operates the electromagnetic fan in the first rotation speed mode in a conduction state when wiring, so that when the first relay is turned on by sending a conduction command to the first relay electrically connected to the first control port, the electromagnetic fan is adjusted to the second rotation speed mode, and when the second relay is turned on by sending a conduction command to the second relay electrically connected to the second control port through the second control port, the electromagnetic fan is adjusted to the first rotation speed mode.
Illustratively, when the first rotation speed mode is a medium-speed operation mode of the electromagnetic fan, and the second rotation speed mode is a high-speed operation mode of the electromagnetic fan, when the above abnormal condition occurs, if the electronic control unit intends to adjust the electromagnetic fan to the medium-speed operation mode, a conduction instruction is sent to a first relay electrically connected with the electromagnetic fan through the first control port, and at this time, the electromagnetic fan is adjusted to the high-speed operation mode, so that excessive heat dissipation of the vehicle is caused, the water temperature of the engine is low, and the performance of the entire vehicle is affected.
Optionally, after determining that the electromagnetic clutch plugging state of the electromagnetic fan is abnormal, the method further includes:
For example, if it is detected that the first engine torque is greater than the second engine torque, it is said that the rotation speed of the electromagnetic fan in the first rotation speed mode is greater than the rotation speed of the electromagnetic fan in the second rotation speed mode, and when the connection state of the electromagnetic fan and the electromagnetic clutch is normal, the condition that the preset rotation speed value in the first rotation speed mode is less than the preset rotation speed value in the second rotation speed mode does not match, it may be determined that the connection state of the electromagnetic clutch is abnormal, and the specific abnormal condition may be that the first control port is electrically connected to a relay which operates the electromagnetic fan in the second rotation speed mode in a conduction state, and the second control port is electrically connected to the relay which operates the electromagnetic fan in the first rotation speed mode in a conduction state. Therefore, to enable the electromagnetic fan to normally operate, that is, to enable the first engine torque in the first rotation speed mode to be smaller than the second engine torque in the second rotation speed mode, under the conditions that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, that is, no other load exists, the rotation speed of the electromagnetic fan in the first rotation speed mode should be smaller than that of the electromagnetic fan in the second rotation speed mode, and after the wiring of the whole vehicle wiring harness is completed, the wiring is not easily changed, so that the rotation speed mode of the electromagnetic fan is adjusted by directly adjusting the sending port of the conduction instruction, that is, the electromagnetic fan is enabled to operate according to the second rotation speed mode by sending the second conduction instruction to the first relay through the first control port; and sending a first conduction instruction to the second relay through the second control port so as to enable the electromagnetic fan to operate according to the first rotating speed mode.
For example, when the first rotation speed mode is a medium speed operation mode and the second rotation speed mode is a high speed operation mode, if the connection is reversed, the electromagnetic fan operates in the second rotation speed mode when the first relay electrically connected to the first control port is turned on, and the electromagnetic fan operates in the first rotation speed mode when the second relay electrically connected to the second control port is turned on. When the electronic control unit needs to adjust the electromagnetic fan to be in the first rotating speed mode, a first conduction instruction can be sent to a second relay electrically connected with the electronic control unit through a second control port, so that the second relay is conducted, and the electromagnetic fan operates in the first rotating speed mode, so that the vehicle cooling system can normally operate.
Optionally, after determining that the electromagnetic clutch plugging state of the electromagnetic fan is abnormal, the method further includes:
and step 140, if the difference value of the first engine torque and the second engine torque is smaller than the engine torque threshold value, judging that the electromagnetic clutch coil has a fault, and outputting a prompt for checking the working condition of the electromagnetic clutch coil.
With the use of the electromagnetic fan, the electromagnetic clutch coil of the electromagnetic fan may be aged, causing a malfunction. After the abnormal connection state of the electromagnetic clutch is judged according to the fact that the first engine torque is larger than the second engine torque, the fault state of the electromagnetic clutch coil can be continuously judged. Under the condition that the electromagnetic clutch of the electromagnetic fan is abnormal in plugging state and the electromagnetic clutch coil works normally, the first torque of the engine is far larger than the second torque of the engine, so when the difference value between the first engine torque and the second engine torque is smaller than a preset engine torque threshold value, the failure of the electromagnetic clutch coil can be judged, a prompt for checking the working condition of the electromagnetic clutch coil is output, the failure of the electromagnetic clutch coil is found, and the normal operation of the electromagnetic fan is ensured.
Optionally, before detecting that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, the method further includes:
and 11, if the situation that the connection path between the first relay and the first control port and the connection path between the second relay and the second control port are not subjected to open-circuit fault or short-circuit fault is detected, controlling to continuously execute the detection process of the electromagnetic fan.
Specifically, before the step 101, that is, before the detection of the electromagnetic fan is triggered, it may be first detected whether a short-circuit fault or an open-circuit fault exists in a connection path between the first relay and the first control port and a connection path between the second relay and the second control port, and when the short-circuit fault or the open-circuit fault exists, the electromagnetic fan cannot be normally detected, so that when the short-circuit fault or the open-circuit fault does not exist in the connection path between the first relay and the first control port and the connection path between the second relay and the second control port, the electromagnetic fan is controlled to continue to execute the detection process of the electromagnetic fan.
Optionally, the detection method further includes:
and step 12, if the connection path between the first relay and the first control port and/or the connection path between the second relay and the second control port is detected to have a disconnection fault or a short-circuit fault, controlling to report the fault of the connection path between the first relay and the first control port and/or the connection path between the second relay and the second control port, and controlling to quit the detection flow of the electromagnetic fan.
If the connection path of the first relay and the first control port and/or the connection path of the second relay and the second control port has a disconnection fault or a short-circuit fault, controlling to report the specific fault of the connection path with the fault so as to provide reference for maintenance personnel, facilitate maintenance and control the detection flow of the electromagnetic fan.
According to the technical scheme of the embodiment, after the abnormal plugging state of the electromagnetic clutch of the electromagnetic fan is judged, the control port for sending the conduction instruction is adjusted in time, so that the electromagnetic fan can normally run under the condition of not changing the wiring of the whole vehicle, and the normal running of a vehicle cooling system is ensured; after the electromagnetic clutch plugging state of the electromagnetic fan is judged to be abnormal, the fault state of the electromagnetic clutch coil is judged according to the difference value of the first engine torque and the second engine torque, and the aging condition of the electromagnetic clutch coil can be found in time; and before the plug-in state of the electromagnetic clutch is judged, the conventional fault detection of the control system of the electromagnetic fan is realized by detecting the connection path of the first relay and the first control port and the connection path of the second relay and the second control port.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a detection apparatus for an electromagnetic fan according to a third embodiment of the present invention, where the detection apparatus is applicable to a situation of detecting the electromagnetic fan, the detection apparatus is applied to a control system for the electromagnetic fan, the control system for the electromagnetic fan includes the electromagnetic fan, an electronic control unit, and an engine, and the detection apparatus includes:
the control module 220 is configured to, when it is detected that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, control the electromagnetic fan to adjust to a first rotation speed mode and obtain a first engine torque of the engine, and then control the electromagnetic fan to adjust to a second rotation speed mode and obtain a second engine torque of the engine, where a preset rotation speed value in the first rotation speed mode is smaller than a preset rotation speed value in the second rotation speed mode;
the determination module 230 is configured to determine that an electromagnetic clutch connection state of the electromagnetic fan is abnormal if the first engine torque is detected to be greater than the second engine torque.
On the basis of the foregoing scheme, optionally, the determining module 230 is further configured to determine that the electromagnetic clutch plugging state of the electromagnetic fan is normal if the first engine torque is smaller than the second engine torque.
On the basis of the above scheme, optionally, the detection apparatus further includes a trigger detection module 210, configured to detect whether the electronic control unit receives a trigger instruction for detecting the electromagnetic fan before controlling the electromagnetic fan to adjust to the first rotation speed mode and acquiring a first engine torque of the engine, and if so, control to continue to execute a detection process of the electromagnetic fan.
The embodiment provides a detection device for an electromagnetic fan, which controls the electromagnetic fan to adjust to a first rotation speed mode and obtain a first engine torque of an engine and then controls the electromagnetic fan to adjust to a second rotation speed mode and obtain a second engine torque of the engine after a control module is powered on an electronic control unit, under the condition that an accelerator opening is 0 and a vehicle speed is 0, that is, no other load exists, wherein a preset rotation speed value in the first rotation speed mode is smaller than a preset rotation speed value in the second rotation speed mode, so that under the condition that a connection state of an electromagnetic fan control system is normal, power required when the electromagnetic fan operates in the first rotation speed mode should be smaller than power required when the electromagnetic fan operates in the second rotation speed mode, that is, the first engine torque should be smaller than the second engine torque. The determination module determines that the electromagnetic clutch connection state of the electromagnetic fan is abnormal if the first engine torque is detected to be greater than the second engine torque. The embodiment of the invention solves the problem that the electronic control unit in the prior art cannot detect that the relay for controlling the medium-speed running of the electromagnetic fan and the relay for controlling the high-speed running of the electromagnetic fan are reversely connected with the corresponding control pins, thereby generating adverse effect on a vehicle cooling system, realizing the detection of the electromagnetic fan, finding the abnormal condition of the connection state of the electromagnetic clutch of the electromagnetic fan in time, and further ensuring the normal running of the vehicle cooling system.
Example four
Fig. 4 is a schematic structural diagram of a detecting apparatus for an electromagnetic fan according to a fourth embodiment of the present invention, and this embodiment further provides an optional detecting apparatus for an electromagnetic fan on the basis of the third embodiment.
Optionally, the control system of the electromagnetic fan further includes a first relay and a second relay, and the electronic control unit includes a first control port and a second control port;
the control module 220 is configured to send a first conduction instruction to a first relay electrically connected to the first control port through the first control port so as to operate the electromagnetic fan according to the first rotation speed mode, and is further configured to send a second conduction instruction to a second relay electrically connected to the second control port through the second control port so as to operate the electromagnetic fan according to the second rotation speed mode.
Optionally, the detecting device further includes: and the correcting module 240 is used for sending a second conduction instruction to the first relay through the first control port to enable the electromagnetic fan to operate according to the second rotating speed mode after the electromagnetic clutch plugging state of the electromagnetic fan is judged to be abnormal, and sending a first conduction instruction to the second relay through the second control port to enable the electromagnetic fan to operate according to the first rotating speed mode.
Optionally, the detecting device further includes: and a clutch coil failure determination module 250, configured to determine that a clutch coil fails and output a prompt for checking a working condition of the clutch coil if a difference between the first engine torque and the second engine torque is smaller than an engine torque threshold after determining that the electromagnetic clutch connection state of the electromagnetic fan is abnormal.
Optionally, the detecting device further includes: the circuit fault detection module 260 is configured to detect whether a short-circuit fault or a disconnection fault occurs in a connection path between the first relay and the first control port and a connection path between the second relay and the second control port before detecting that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0;
and if the situation that the open circuit fault or the short circuit fault does not exist in the connection path between the first relay and the first control port and the connection path between the second relay and the second control port is detected, controlling to continuously execute the detection process of the electromagnetic fan.
Optionally, the circuit fault detecting module 260 is further configured to, if it is detected that a disconnection fault or a short-circuit fault exists in a connection path between the first relay and the first control port and/or a connection path between the second relay and the second control port, control to report an error in a connection path between the first relay and the first control port and/or a fault in a connection path between the second relay and the second control port, and control to exit a detection process of the electromagnetic fan.
According to the detection device for the electromagnetic fan, the correction module is used for adjusting the control port for sending the conduction instruction in time after judging that the plugging state of the electromagnetic clutch of the electromagnetic fan is abnormal, so that the electromagnetic fan can normally run under the condition of not changing the wiring of the whole vehicle, and the normal operation of a vehicle cooling system is ensured; after the electromagnetic clutch plugging state of the electromagnetic fan is judged to be abnormal, the fault state of the electromagnetic clutch coil is judged through the difference value of the first engine torque and the second engine torque of the clutch coil fault judgment module, and the aging condition of the electromagnetic clutch coil can be found in time; and before the plugging state of the electromagnetic clutch is judged, the circuit fault detection module is used for detecting the connection path of the first relay and the first control port and the connection path of the second relay and the second control port, so that the conventional fault detection of the control system of the electromagnetic fan is realized.
EXAMPLE five
Fig. 5 is a schematic structural diagram of a detection system of an electromagnetic fan according to a fifth embodiment of the present invention. The present embodiment is applicable to the case of detecting an electromagnetic fan, and the detection system 50 includes the detection apparatus 200 for an electromagnetic fan, the electronic control unit 20, the electromagnetic fan 30, and the engine 40 provided in any of the above embodiments. Wherein the detection means 200 of the electromagnetic fan are integrated in the electronic control unit 20.
The embodiment provides a detection system of an electromagnetic fan, after an electronic control unit is powered on through a control module, under the condition that an accelerator opening is 0 and a vehicle speed is 0, that is, no other load exists, the electromagnetic fan is controlled to be adjusted to a first rotation speed mode and obtain a first engine torque of an engine, and then the electromagnetic fan is controlled to be adjusted to a second rotation speed mode and obtain a second engine torque of the engine, wherein a preset rotation speed value in the first rotation speed mode is smaller than a preset rotation speed value in the second rotation speed mode, so that under the condition that a connection state of an electromagnetic fan control system is normal, power required when the electromagnetic fan operates in the first rotation speed mode should be smaller than power required when the electromagnetic fan operates in the second rotation speed mode, that is, the first engine torque should be smaller than the second engine torque. The determination module determines that the electromagnetic clutch connection state of the electromagnetic fan is abnormal if the first engine torque is detected to be greater than the second engine torque. The embodiment of the invention solves the problem that the electronic control unit in the prior art cannot detect that the relay for controlling the medium-speed running of the electromagnetic fan and the relay for controlling the high-speed running of the electromagnetic fan are reversely connected with the corresponding control pins, thereby generating adverse effect on a vehicle cooling system, realizing the detection of the electromagnetic fan, finding the abnormal condition of the connection state of the electromagnetic clutch of the electromagnetic fan in time, and further ensuring the normal running of the vehicle cooling system.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (16)
1. A detection method of an electromagnetic fan is characterized in that the detection method is applied to a control system of the electromagnetic fan, the control system of the electromagnetic fan comprises the electromagnetic fan, an electronic control unit and an engine, and the detection method comprises the following steps:
when the electronic control unit is electrified, the opening of an accelerator is 0 and the speed of a vehicle is 0, controlling the electromagnetic fan to be adjusted to a first rotating speed mode and obtain a first engine torque of the engine, and then controlling the electromagnetic fan to be adjusted to a second rotating speed mode and obtain a second engine torque of the engine, wherein a preset rotating speed value in the first rotating speed mode is smaller than a preset rotating speed value in the second rotating speed mode;
if the first engine torque is detected to be larger than the second engine torque, judging that the electromagnetic clutch plugging state of the electromagnetic fan is abnormal;
after the electromagnetic fan is judged to have abnormal electromagnetic clutch plugging state, the method further comprises the following steps:
and if the difference value of the first engine torque and the second engine torque is smaller than the engine torque threshold value, judging that the electromagnetic clutch coil has a fault, and outputting a prompt for checking the working condition of the electromagnetic clutch coil.
2. The method of claim 1, wherein the control system of the electromagnetic fan further comprises a first relay, a second relay, the electronic control unit comprising a first control port and a second control port;
the specific implementation process for controlling the electromagnetic fan to be adjusted to the first rotating speed mode is as follows: sending a first conduction instruction to the first relay electrically connected with the first control port through the first control port so as to enable the electromagnetic fan to operate according to a first rotating speed mode;
the specific execution process for controlling the electromagnetic fan to be adjusted to the second rotating speed mode comprises the following steps: and sending a second conduction instruction to a second relay electrically connected with the second control port through the second control port so as to enable the electromagnetic fan to operate according to a second rotating speed mode.
3. The detection method according to claim 2, further comprising, after determining that an electromagnetic clutch engagement state of the electromagnetic fan is abnormal:
sending a second conduction instruction to the first relay through the first control port so that the electromagnetic fan operates according to a second rotating speed mode; and sending a first conduction instruction to the second relay through the second control port so as to enable the electromagnetic fan to operate according to a first rotating speed mode.
4. The detection method according to claim 1, further comprising:
and if the first engine torque is smaller than the second engine torque, determining that the electromagnetic clutch plugging state of the electromagnetic fan is normal.
5. The detection method according to claim 2, before detecting that the electronic control unit is powered on, the accelerator opening is 0, and the vehicle speed is 0, further comprising:
detecting whether a short-circuit fault or a disconnection fault occurs in a connection path between the first relay and the first control port and a connection path between the second relay and the second control port;
and if the situation that the open circuit fault or the short circuit fault does not exist in the connection path between the first relay and the first control port and the connection path between the second relay and the second control port is detected, controlling to continuously execute the detection process of the electromagnetic fan.
6. The method according to claim 5, wherein if it is detected that the open-circuit fault or the short-circuit fault exists in the connection path between the first relay and the first control port and/or the connection path between the second relay and the second control port, the fault of the connection path between the first relay and the first control port and/or the connection path between the second relay and the second control port is reported, and the detection process of the electromagnetic fan is exited.
7. The detection method according to claim 1, before controlling the electromagnetic fan to adjust to a first rotational speed mode and obtaining a first engine torque of the engine, further comprising:
and detecting whether the electronic control unit receives a trigger instruction for detecting the electromagnetic fan, and if so, controlling to continue to execute the detection process of the electromagnetic fan.
8. The detection device of the electromagnetic fan is characterized in that the detection device is applied to a control system of the electromagnetic fan, the control system of the electromagnetic fan comprises the electromagnetic fan, an electronic control unit and an engine, and the detection device comprises:
the control module is used for controlling the electromagnetic fan to be adjusted to a first rotating speed mode and acquiring a first engine torque of the engine and then controlling the electromagnetic fan to be adjusted to a second rotating speed mode and acquiring a second engine torque of the engine when the electronic control unit is electrified, the accelerator opening is 0 and the vehicle speed is 0, wherein a preset rotating speed value in the first rotating speed mode is smaller than a preset rotating speed value in the second rotating speed mode;
the judging module is used for judging that the electromagnetic clutch plugging state of the electromagnetic fan is abnormal if the first engine torque is detected to be larger than the second engine torque;
the detection device further comprises: and the clutch coil fault judging module is used for judging that the clutch coil has a fault and outputting a prompt for checking the working condition of the clutch coil if the difference value of the first engine torque and the second engine torque is smaller than an engine torque threshold value after judging that the electromagnetic clutch plugging state of the electromagnetic fan is abnormal.
9. The detection device according to claim 8, wherein the control system of the electromagnetic fan further comprises a first relay, a second relay, the electronic control unit comprising a first control port and a second control port;
the control module is configured to send a first conduction instruction to the first relay electrically connected to the first control port through the first control port so that the electromagnetic fan operates in a first rotational speed mode, and is further configured to send a second conduction instruction to the second relay electrically connected to the second control port through the second control port so that the electromagnetic fan operates in a second rotational speed mode.
10. The detection device of claim 9, further comprising: and the correction module is used for sending a second conduction instruction to the first relay through the first control port so as to enable the electromagnetic fan to operate according to a second rotating speed mode after judging that the plugging state of the electromagnetic clutch of the electromagnetic fan is abnormal, and sending a first conduction instruction to the second relay through the second control port so as to enable the electromagnetic fan to operate according to a first rotating speed mode.
11. The detecting device according to claim 8, wherein the determining module is further configured to determine that the electromagnetic clutch plugging state of the electromagnetic fan is normal if the first engine torque is smaller than the second engine torque.
12. The detection device of claim 9, further comprising: the circuit fault detection module is used for detecting whether a connection path between the first relay and the first control port and a connection path between the second relay and the second control port have a short-circuit fault or a broken-circuit fault before detecting that the electronic control unit is powered on, the throttle opening is 0 and the vehicle speed is 0;
and if the situation that the open circuit fault or the short circuit fault does not exist in the connection path between the first relay and the first control port and the connection path between the second relay and the second control port is detected, controlling to continuously execute the detection process of the electromagnetic fan.
13. The apparatus according to claim 12, wherein the circuit fault detection module is further configured to, if it is detected that the open-circuit fault or the short-circuit fault exists in the connection path between the first relay and the first control port and/or the connection path between the second relay and the second control port, control to report an error in the existence of the fault in the connection path between the first relay and the first control port and/or the connection path between the second relay and the second control port, and control to exit the electromagnetic fan detection process.
14. The detection device according to claim 8, further comprising a trigger detection module, configured to detect whether the electronic control unit receives a trigger instruction for detecting the electromagnetic fan before controlling the electromagnetic fan to adjust to the first rotation speed mode and obtaining the first engine torque of the engine, and if so, control to continue to perform the detection process on the electromagnetic fan.
15. An electromagnetic fan inspection system comprising the electromagnetic fan inspection apparatus of any one of claims 8 to 14, an electronic control unit, an electromagnetic fan, and a motor.
16. Detection system according to claim 15, characterised in that the detection means of the electromagnetic fan are integrated in the electronic control unit.
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| CN112963237B (en) * | 2021-03-17 | 2022-04-26 | 潍柴动力股份有限公司 | Method, device and equipment for detecting running state of electric control silicone oil clutch |
| CN113864221B (en) * | 2021-10-25 | 2024-05-17 | 潍柴动力股份有限公司 | Control method of electromagnetic fan |
| CN114991934B (en) * | 2022-06-10 | 2024-02-06 | 上海源悦汽车电子股份有限公司 | Engine coolant temperature control method, system and readable storage module |
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| US6273034B1 (en) * | 2000-05-17 | 2001-08-14 | Detroit Diesel Corporation | Closed loop fan control using fan motor pressure feedback |
| DE102008017326A1 (en) * | 2008-04-04 | 2009-10-08 | Daimler Ag | Method for controlling blower for cooling system of motor vehicle engine, involves releasing signals by engine controller by data cable for controlling blower at blower controller |
| JP6113455B2 (en) * | 2012-10-12 | 2017-04-12 | 日野自動車株式会社 | On-vehicle power control device cooling system and abnormality diagnosis method thereof |
| CN203476478U (en) * | 2013-08-16 | 2014-03-12 | 龙口澳雷樽传动机械有限公司 | Clutch transmission device |
| JP2015059458A (en) * | 2013-09-18 | 2015-03-30 | 日立オートモティブシステムズ株式会社 | Control device for cooling system |
| US9562933B2 (en) * | 2013-12-03 | 2017-02-07 | Ford Global Technologies, Llc | Diagnostic method for multiple speed relay-controlled electric fan |
| CN104295357B (en) * | 2014-09-05 | 2017-09-12 | 龙口中宇热管理系统科技有限公司 | Radiator and its control method |
| CN104895818B (en) * | 2015-04-27 | 2018-06-08 | 潍柴动力股份有限公司 | A kind of control method of engine electric-controlled fan, apparatus and system |
| CN206682023U (en) * | 2017-04-27 | 2017-11-28 | 安徽江淮汽车集团股份有限公司 | A kind of control system of truck cooling fan |
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