An electrically controlled silicone oil fan clutch fault detection method and device

Abstract

The application provides a kind of electric control silicone oil fan clutch fault detection method and device, the method includes: the electronic control unit of the vehicle to be tested responds to test instruction, obtains the fan speed of fan at the full engagement state of electric control silicone oil fan clutch, determines fan speed ratio based on fan speed and idle speed;Control engine from idle speed to set speed operation;Control electric control silicone oil fan clutch in the state of engine at set speed operation is separated, obtains the separation performance parameter of electric control silicone oil fan clutch;Based on separation performance parameter, separation fault detection is carried out to electric control silicone oil fan clutch;Control electric control silicone oil fan clutch in the state of engine at set speed operation is engaged, obtains the engagement performance parameter of electric control silicone oil fan clutch based on fan speed ratio;Electronic control unit is based on engagement performance parameter, engagement fault detection is carried out to electric control silicone oil fan clutch.

Description

Technical Field

[0001] This application relates to the field of vehicle power auxiliary components technology, and in particular to a method and device for detecting faults in an electronically controlled silicone oil fan clutch. Background Technology

[0002] In the prior art, in order to reduce the power consumption of the engine fan, which is one of the auxiliary power components of the vehicle, reduce noise and wear, prevent the engine from overcooling, reduce pollution, and save fuel, most engines use electronically controlled silicone oil fan clutches.

[0003] The electronically controlled silicone oil fan clutch requires frequent engagement and disengagement during actual use, which causes significant stress on the clutch. To ensure its reliability, fault detection of the electronically controlled silicone oil fan clutch is necessary.

[0004] Currently, the commonly used fault detection method is to test the electronically controlled silicone oil fan clutch on a test bench and have the faults in the electronically controlled silicone oil fan clutch be judged manually. This method is prone to misjudgment and cannot be used for fault detection at the fault site, resulting in a poor user experience. Summary of the Invention

[0005] This application provides the following technical solution:

[0006] This application provides a method for detecting faults in an electronically controlled silicone oil fan clutch, including:

[0007] The electronic control unit of the vehicle under test responds to the test command and controls the electronically controlled silicone oil fan clutch to engage when the engine is running at idle speed, obtains the fan speed when the electronically controlled silicone oil fan clutch is fully engaged, and determines the fan speed ratio based on the fan speed and the idle speed.

[0008] The electronic control unit controls the engine to increase its speed from the idle speed to a set speed.

[0009] The electronic control unit controls the electronically controlled silicone oil fan clutch to disengage when the engine is running at a set speed, and obtains the disengagement performance parameters of the electronically controlled silicone oil fan clutch based on the fan speed.

[0010] The electronic control unit performs separation fault detection on the electronically controlled silicone oil fan clutch based on the separation performance parameters;

[0011] The electronic control unit controls the electronically controlled silicone oil fan clutch to engage when the engine is running at a set speed, and obtains the engagement performance parameters of the electronically controlled silicone oil fan clutch based on the fan speed ratio.

[0012] The electronic control unit performs engagement fault detection on the electronically controlled silicone oil fan clutch based on the engagement performance parameters.

[0013] Optionally, the electronic control unit controls the electronically controlled silicone oil fan clutch to disengage when the engine is running at a set speed, and obtains the disengagement performance parameters of the electronically controlled silicone oil fan clutch based on the fan speed, including:

[0014] When the engine is running at a set speed, the electronic control unit outputs a separation signal to the electronically controlled silicone oil fan clutch and starts timing. When the fan speed drops below a first set fan speed threshold, the timing stops, and the first timing duration and the first fan speed at which the timing stops are obtained.

[0015] The electronic control unit determines the first timing duration as the disengagement time of the electronically controlled silicone oil fan clutch;

[0016] The electronic control unit determines the speed of the first fan as the separation speed.

[0017] Optionally, the electronic control unit performs separation fault detection on the electronically controlled silicone oil fan clutch based on the separation performance parameters, including:

[0018] The electronic control unit determines whether the separation time meets the separation time threshold and whether the separation speed is stable within a set time.

[0019] If so, the electronic control unit determines that the electronically controlled silicone oil fan clutch has no disengagement fault;

[0020] If not, the electronic control unit outputs the cause of the separation failure and the corresponding separation time and / or separation speed.

[0021] Optionally, the electronic control unit controls the electronically controlled silicone oil fan clutch to engage when the engine is running at a set speed, and obtains the engagement performance parameters of the electronically controlled silicone oil fan clutch based on the fan speed ratio, including:

[0022] The electronic control unit outputs an engagement signal to the electronically controlled silicone oil fan clutch when the engine is running at a set speed, and starts timing. When the fan speed increases to a level greater than a second set fan speed threshold, the timing stops, and the second timing duration and the second fan speed at which the timing stops are obtained. The second set fan speed threshold is the product of a set percentage, the set speed, and the fan speed ratio.

[0023] The electronic control unit determines the second timing duration as the engagement time of the electronically controlled silicone oil fan clutch;

[0024] The electronic control unit determines the slip ratio of the electronically controlled silicone oil fan clutch based on the set rotation speed, the fan speed ratio, and the second fan speed.

[0025] Optionally, the electronic control unit performs engagement fault detection on the electronically controlled silicone oil fan clutch based on the engagement performance parameters, including:

[0026] The electronic control unit determines whether the engagement time meets the engagement time threshold and whether the slip rate meets the slip rate threshold.

[0027] If so, the electronic control unit determines that the electronically controlled silicone oil fan clutch has no engagement fault;

[0028] If not, the electronic control unit outputs the cause of the meshing failure and the meshing time and / or slip rate corresponding to the cause of the meshing failure.

[0029] Another aspect of this application provides a fault detection device for an electronically controlled silicone oil fan clutch, comprising:

[0030] The first processing unit is used to respond to test commands, control the electronically controlled silicone oil fan clutch to engage when the engine is running at idle speed, obtain the fan speed when the electronically controlled silicone oil fan clutch is fully engaged, and determine the fan speed ratio based on the fan speed and the idle speed.

[0031] The first control unit is used to control the engine to increase its speed from the idle speed to a set speed.

[0032] The second processing unit is used to control the electronically controlled silicone oil fan clutch to disengage when the engine is running at a set speed, and to obtain the disengagement performance parameters of the electronically controlled silicone oil fan clutch based on the fan speed.

[0033] The first detection unit is used to detect separation failures of the electronically controlled silicone oil fan clutch based on the separation performance parameters.

[0034] The third processing unit is used to control the electronically controlled silicone oil fan clutch to engage when the engine is running at a set speed, and to obtain the engagement performance parameters of the electronically controlled silicone oil fan clutch based on the fan speed ratio.

[0035] The second detection unit is used to detect engagement failures in the electronically controlled silicone oil fan clutch based on the engagement performance parameters.

[0036] Optionally, the second processing unit is specifically used for:

[0037] When the engine is running at a set speed, a separation signal is output to the electronically controlled silicone oil fan clutch and a timer is started. The timer stops when the fan speed drops below a first set fan speed threshold, and the first timer duration and the first fan speed at which the timer stops are obtained.

[0038] The first timing duration is determined as the disengagement time of the electronically controlled silicone oil fan clutch;

[0039] The speed of the first fan is determined as the separation speed.

[0040] Optionally, the first detection unit is specifically used for:

[0041] Determine whether the separation time meets the separation time threshold and whether the separation speed is stable within a set duration;

[0042] If so, it is confirmed that the electronically controlled silicone oil fan clutch has no disengagement fault;

[0043] If not, output the cause of the separation failure and the corresponding separation time and / or separation speed.

[0044] Optionally, the third processing unit is specifically used for:

[0045] When the engine is running at a set speed, an engagement signal is output to the electronically controlled silicone oil fan clutch and timing begins. Timing stops when the fan speed increases to a level greater than a second set fan speed threshold. The second timing duration and the second fan speed at which timing stops are obtained. The second set fan speed threshold is the product of a set percentage, the set speed, and the fan speed ratio.

[0046] The second timing duration is determined as the engagement time of the electronically controlled silicone oil fan clutch;

[0047] Based on the set rotational speed, the fan speed ratio, and the second fan rotational speed, the slip ratio of the electronically controlled silicone oil fan clutch is determined.

[0048] Optionally, the second detection unit is specifically used for:

[0049] Determine whether the engagement time meets the engagement time threshold and whether the slip rate meets the slip rate threshold;

[0050] If so, it is confirmed that the electronically controlled silicone oil fan clutch has no engagement fault;

[0051] If not, output the cause of the meshing failure and the meshing time and / or slip rate corresponding to the cause of the meshing failure.

[0052] In this application, the electronic control unit (ECU) of the vehicle under test responds to test commands, controlling the electronically controlled silicone oil fan clutch to engage while the engine is idling. The fan speed at which the clutch is fully engaged is obtained. Based on the fan speed and the idle speed, the fan speed ratio is determined. The engine is then controlled to increase from idle speed to a set speed. The ECU is then controlled to disengage while the engine is running at the set speed, obtaining the clutch's disengagement performance parameters. Based on these parameters, disengagement fault detection is performed on the ECU. Conversely, the ECU is also controlled to engage while the engine is running at the set speed, and engagement performance parameters are obtained based on the fan speed ratio. Engagement fault detection is then performed on these parameters. This method enables automatic fault detection of the electronically controlled silicone oil fan clutch by the ECU, without location restrictions, allowing for on-site fault detection. Furthermore, it eliminates the need for manual judgment, improving the accuracy of fault detection.

[0053] Furthermore, by controlling the engine to increase from idle speed to a set speed, controlling the electronically controlled silicone oil fan clutch to disengage when the engine is running at the set speed, and controlling the electronically controlled silicone oil fan clutch to engage when the engine is running at the set speed, the efficiency of disengagement and engagement can be accelerated, the fault detection time can be shortened, and the fault detection efficiency can be improved. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0055] Figure 1 This is a flowchart illustrating a fault detection method for an electronically controlled silicone oil fan clutch provided in Embodiment 1 of this application;

[0056] Figure 2 This is a flowchart illustrating a fault detection method for an electronically controlled silicone oil fan clutch provided in Embodiment 2 of this application;

[0057] Figure 3 This is a flowchart illustrating a fault detection method for an electronically controlled silicone oil fan clutch provided in Embodiment 3 of this application;

[0058] Figure 4 This is a flowchart illustrating a fault detection method for an electronically controlled silicone oil fan clutch provided in Embodiment 4 of this application;

[0059] Figure 5 This is a flowchart illustrating a fault detection method for an electronically controlled silicone oil fan clutch provided in Embodiment 5 of this application;

[0060] Figure 6 This is another flowchart illustrating a fault detection method for an electronically controlled silicone oil fan clutch provided in Embodiment 5 of this application;

[0061] Figure 7 This is a schematic diagram of the structure of an electronically controlled silicone oil fan clutch fault detection device provided in this application. Detailed Implementation

[0062] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0063] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0064] Reference Figure 1 This is a flowchart illustrating a fault detection method for an electronically controlled silicone oil fan clutch provided in Embodiment 1 of this application. Figure 1 As shown, the method may include, but is not limited to, the following steps:

[0065] Step S101: The electronic control unit of the vehicle under test responds to the test command and controls the electronically controlled silicone oil fan clutch to engage when the engine is running at idle speed, so as to obtain the fan speed when the electronically controlled silicone oil fan clutch is fully engaged, and determine the fan speed ratio based on the fan speed and idle speed.

[0066] In this embodiment, after the vehicle under test is powered on, the vehicle fault codes can be read to check if there are any fault codes related to the electronically controlled silicone oil fan clutch. If not, under the condition that the vehicle under test meets the shielding cooling requirements, the vehicle speed is 0 and the ignition lock is in the ON position, the test equipment can be connected to the vehicle under test and send test commands to the electronic control unit of the vehicle under test.

[0067] The test commands can be sent via, but are not limited to, CAN bus messages. Accordingly, the electronic control unit (ECU) obtains the test commands by parsing the CAN bus messages. After responding to the test commands, the ECU can send an acknowledgment signal back to the test equipment.

[0068] The electronic control unit can output a 0% duty cycle signal to the electronically controlled silicone oil fan clutch, so that the electronically controlled silicone oil fan clutch engages when the engine is running at idle speed.

[0069] Full engagement can be understood as maintaining the fan speed at a high speed, and the fan speed no longer increasing.

[0070] Step S102: The electronic control unit controls the engine to increase from idle speed to the set speed.

[0071] The set speed can be set as needed and is not limited in this application. For example, the set speed can be, but is not limited to, the engine's rated speed.

[0072] Step S103: The electronic control unit controls the electronically controlled silicone oil fan clutch to disengage when the engine is running at a set speed. Based on the fan speed, the disengagement performance parameters of the electronically controlled silicone oil fan clutch are obtained.

[0073] The electronic control unit controls the engine to accelerate from idle speed to a set speed. After the set speed has stabilized for a set period, it controls the electronically controlled silicone oil fan clutch to disengage while the engine is running at the set speed. The set period can be set as needed and is not limited in this application. For example, the set period can be, but is not limited to, 60 seconds.

[0074] The disengagement performance parameters of the electronically controlled silicone oil fan clutch can characterize the disengagement status of the electronically controlled silicone oil fan clutch.

[0075] In this embodiment, the test equipment can send a first command to the electronic control unit via CAN bus messages to trigger the electronic control unit to control the engine to increase from idle speed to a set speed, and control the electronically controlled silicone oil fan clutch to disengage when the engine is running at the set speed, thereby obtaining the disengagement performance parameters of the electronically controlled silicone oil fan clutch.

[0076] Of course, the electronic control unit can also automatically control the engine to increase from idle speed to a set speed, and control the electronically controlled silicone oil fan clutch to disengage when the engine is running at a set speed, thereby obtaining the disengagement performance parameters of the electronically controlled silicone oil fan clutch.

[0077] Step S104: The electronic control unit performs separation fault detection on the electronically controlled silicone oil fan clutch based on the separation performance parameters.

[0078] The electronic control unit detects separation faults in the electronically controlled silicone oil fan clutch based on separation performance parameters to determine whether a separation fault exists in the electronically controlled silicone oil fan clutch.

[0079] Step S105: The electronic control unit controls the electronically controlled silicone oil fan clutch to engage when the engine is running at a set speed. Based on the fan speed ratio, the engagement performance parameters of the electronically controlled silicone oil fan clutch are obtained.

[0080] Understandably, the input speed of the electronically controlled silicone oil fan clutch can be determined based on the fan speed ratio, and the engagement performance parameters of the electronically controlled silicone oil fan clutch can be obtained based on the input speed.

[0081] The engagement performance parameters of the electronically controlled silicone oil fan clutch can characterize the engagement status of the electronically controlled silicone oil fan clutch.

[0082] In this embodiment, the test equipment can send a second command to the electronic control unit via CAN bus messages to trigger the electronic control unit to control the electronically controlled silicone oil fan clutch to engage when the engine is running at a set speed. Based on the fan speed ratio, the engagement performance parameters of the electronically controlled silicone oil fan clutch can be obtained.

[0083] Of course, the electronic control unit can also automatically control the electronically controlled silicone oil fan clutch to engage when the engine is running at a set speed, and obtain the engagement performance parameters of the electronically controlled silicone oil fan clutch based on the fan speed ratio.

[0084] Step S105 can be triggered if the separation fault detection result in step S104 is that there is no separation fault. Of course, the triggering of step S105 can also be unaffected by the separation fault detection result.

[0085] Step S106: The electronic control unit performs engagement fault detection on the electronically controlled silicone oil fan clutch based on the engagement performance parameters.

[0086] The electronic control unit detects engagement faults in the electronically controlled silicone oil fan clutch based on engagement performance parameters to determine whether an engagement fault exists in the electronically controlled silicone oil fan clutch.

[0087] In this application, the electronic control unit (ECU) of the vehicle under test responds to test commands, controlling the electronically controlled silicone oil fan clutch to engage while the engine is idling. The fan speed at which the clutch is fully engaged is obtained. Based on the fan speed and the idle speed, the fan speed ratio is determined. The engine is then controlled to increase from idle speed to a set speed. The ECU is then controlled to disengage while the engine is running at the set speed, obtaining the clutch's disengagement performance parameters. Based on these parameters, disengagement fault detection is performed on the ECU. Conversely, the ECU is also controlled to engage while the engine is running at the set speed, and engagement performance parameters are obtained based on the fan speed ratio. Engagement fault detection is then performed on these parameters. This method enables automatic fault detection of the electronically controlled silicone oil fan clutch by the ECU, without location restrictions, allowing for on-site fault detection. Furthermore, it eliminates the need for manual judgment, improving the accuracy of fault detection.

[0088] Furthermore, by controlling the engine to increase from idle speed to a set speed, controlling the electronically controlled silicone oil fan clutch to disengage when the engine is running at the set speed, and controlling the electronically controlled silicone oil fan clutch to engage when the engine is running at the set speed, the efficiency of disengagement and engagement can be accelerated, the fault detection time can be shortened, and the fault detection efficiency can be improved.

[0089] As another optional embodiment of this application, refer to Figure 2 This is a flowchart illustrating a fault detection method for an electronically controlled silicone oil fan clutch provided in Embodiment 2 of this application. This embodiment mainly refines step S103 in Embodiment 1 above, such as... Figure 2 As shown, step S103 may include, but is not limited to, the following steps:

[0090] Step S1031: When the engine is running at a set speed, the electronic control unit outputs a separation signal to the electronically controlled silicone oil fan clutch and starts timing. When the fan speed drops below the first set fan speed threshold, the timing stops, and the first timing duration and the first fan speed at the time of stopping the timing are obtained.

[0091] In this embodiment, the separation signal can be, but is not limited to, a 100% duty cycle signal.

[0092] The first set fan speed threshold can be set based on the internal control standard of the electronically controlled silicone oil fan clutch. For example, the first set fan speed threshold can be, but is not limited to, 500 rpm.

[0093] Step S1032: The electronic control unit determines the first timing duration as the disengagement time of the electronically controlled silicone oil fan clutch.

[0094] Step S1033: The electronic control unit determines the speed of the first fan as the separation speed.

[0095] In this embodiment, the electronic control unit outputs a separation signal to the electronically controlled silicone oil fan clutch and starts timing. When the fan speed drops below a first set fan speed threshold, the timing stops, obtaining a first timing duration and a first fan speed at which timing stops. The first timing duration is determined as the separation time, and the first fan speed is determined as the separation speed, thus obtaining the separation time and separation speed of the electronically controlled silicone oil fan clutch. Separation fault detection is then performed based on the separation time and separation speed.

[0096] As another optional embodiment of this application, refer to Figure 3 This is a flowchart illustrating a fault detection method for an electronically controlled silicone oil fan clutch provided in Embodiment 3 of this application. This embodiment mainly refines step S104 in Embodiment 2 above, such as... Figure 3 As shown, step S104 may include, but is not limited to, the following steps:

[0097] Step S1041: The electronic control unit determines whether the separation time meets the separation time threshold and whether the separation speed is stable within the set time.

[0098] The separation time threshold can be set according to the first set fan speed threshold.

[0099] The duration can be set as needed and is not limited in this application. For example, the duration can be, but is not limited to, 60 seconds.

[0100] If yes, proceed to step S1042; otherwise, proceed to step S1043.

[0101] Step S1042: The electronic control unit determines that the electronically controlled silicone oil fan clutch has no disengagement fault.

[0102] Step S1043: The electronic control unit outputs the cause of the separation fault and the corresponding separation time and / or separation speed.

[0103] If the separation time does not meet the separation time threshold, the separation failure is caused by the separation time not meeting the requirements; if the separation speed is unstable within the set time, the separation failure is caused by the separation speed not meeting the requirements; if the separation time does not meet the separation time threshold and the separation speed is unstable within the set time, the separation failure is caused by the separation time and separation speed not meeting the requirements.

[0104] In this embodiment, the electronic control unit can output the cause of the separation fault and the corresponding separation time and / or separation speed to the test equipment for display, or to the display screen of the vehicle under test for display, or to the user's electronic device (such as a computer or mobile phone) for display.

[0105] As another optional embodiment of this application, refer to Figure 4 This is a flowchart illustrating a fault detection method for an electronically controlled silicone oil fan clutch provided in Embodiment 4 of this application. This embodiment mainly refines step S105 in Embodiment 1 above, such as... Figure 4 As shown, step S105 may include, but is not limited to, the following steps:

[0106] Step S1051: When the engine is running at a set speed, the electronic control unit outputs an engagement signal to the electronically controlled silicone oil fan clutch and starts timing. When the fan speed increases to a level greater than the second set fan speed threshold, the timing stops, and the second timing duration and the second fan speed at which the timing stops are obtained.

[0107] The engagement signal can be, but is not limited to, a 0% duty cycle signal.

[0108] The second set fan speed threshold is the product of the set percentage, the set speed, and the fan speed ratio.

[0109] The percentage can be set as needed and is not limited in this application. Specifically, the percentage can be set based on, but is not limited to, the internal control standard of the electronically controlled silicone oil fan clutch, and can be set to 80%.

[0110] Step S1052: The electronic control unit determines the second timing duration as the engagement time of the electronically controlled silicone oil fan clutch.

[0111] Step S1053: The electronic control unit determines the slip rate of the electronically controlled silicone oil fan clutch based on the set speed, fan speed ratio, and second fan speed.

[0112] Step S1053 may include, but is not limited to:

[0113] The slip ratio of the electronically controlled silicone oil fan clutch is determined using the following formula:

[0114] Slip rate = (Set speed * Fan speed ratio - Second fan speed) / (Set speed * Fan speed ratio).

[0115] The set speed multiplied by the fan speed ratio can be understood as the input speed of the electronically controlled silicone oil fan clutch.

[0116] Specifically, the slip rate of the electronically controlled silicone oil fan clutch can be determined by using the above relationship if the second fan speed remains stable within a set time period when the timing stops.

[0117] It should be noted that steps S1051-S1053 can also be used as specific implementations of step S105 in Examples 2 and 3.

[0118] In this embodiment, when the engine is running at a set speed, the electronic control unit outputs an engagement signal to the electronically controlled silicone oil fan clutch and starts timing. When the fan speed increases to a level greater than a second set fan speed threshold, the timing stops, obtaining a second timing duration and a second fan speed at which timing stops. The electronic control unit determines the second timing duration as the engagement time of the electronically controlled silicone oil fan clutch. Based on the set speed, fan speed ratio, and second fan speed, the electronic control unit determines the slip ratio of the electronically controlled silicone oil fan clutch, obtaining the engagement time and slip ratio of the electronically controlled silicone oil fan clutch. Then, based on the engagement time and slip ratio, engagement fault detection is performed.

[0119] As another optional embodiment of this application, refer to Figure 5 This is a flowchart illustrating a fault detection method for an electronically controlled silicone oil fan clutch provided in Embodiment 5 of this application. This embodiment mainly refines step S106 in Embodiment 4 above, such as... Figure 5 As shown, step S106 may include, but is not limited to, the following steps:

[0120] Step S1061: The electronic control unit determines whether the engagement time meets the engagement time threshold and whether the slip rate meets the slip rate threshold.

[0121] The engagement time threshold can be set according to the second set fan speed threshold.

[0122] The slip ratio threshold can be set as needed and is not limited in this application. Specifically, it can be set based on the internal control standard of the electronically controlled silicone oil fan clutch, but is not limited to this setting.

[0123] If yes, proceed to step S1062; otherwise, proceed to step S1063.

[0124] Step S1062: The electronic control unit determines that the electronically controlled silicone oil fan clutch has a non-engaging fault.

[0125] Step S1063: The electronic control unit outputs the cause of the meshing failure and the meshing time and / or slip rate corresponding to the cause of the meshing failure.

[0126] If the engagement time does not meet the engagement time threshold, the engagement failure is caused by the engagement time not meeting the requirements; if the slip ratio does not meet the slip ratio threshold, the engagement failure is caused by the slip ratio not meeting the requirements; if both the engagement time and slip ratio do not meet the slip ratio threshold, the engagement failure is caused by both the engagement time and slip ratio not meeting the requirements.

[0127] In this embodiment, the electronic control unit can output the cause of the meshing failure and the corresponding meshing time and / or slip rate to the test equipment for display, or to the display screen of the vehicle under test for display, or to the user's electronic device (such as a computer or mobile phone) for display.

[0128] If the separation time, separation speed, engagement time, and slip rate all meet the requirements, a message indicating that the electronically controlled silicone oil fan clutch is qualified will be output. The electronic control unit controls the engine speed to drop to idle speed within a certain time, thus ending the fault detection.

[0129] The execution of steps S1051-S1053 can be unaffected by the separation fault detection result. Of course, steps S1051-S1053 can also be triggered if the separation fault detection result in step S104 is that there is no separation fault. For example... Figure 6 As shown, if the separation time and separation speed do not meet the requirements, the cause of the separation fault and the corresponding separation time and / or separation speed can be output, and the engine speed can be controlled to drop to idle speed to end the fault detection; if the separation time and separation speed both meet the requirements, the specific implementation steps of steps S1051-S1053 can be triggered after the first fan speed has been stable for 60 seconds.

[0130] The following section introduces a fault detection device for an electronically controlled silicone oil fan clutch provided in this application. The fault detection device for an electronically controlled silicone oil fan clutch described below can be referred to in correspondence with the fault detection method for an electronically controlled silicone oil fan clutch described above.

[0131] Please see Figure 7 The electronically controlled silicone oil fan clutch fault detection device includes: a first processing unit 100, a first control unit 200, a second processing unit 300, a first detection unit 400, a third processing unit 500, and a second detection unit 600.

[0132] The first processing unit 100 is used to respond to test commands, control the electronically controlled silicone oil fan clutch to engage when the engine is running at idle speed, obtain the fan speed when the electronically controlled silicone oil fan clutch is fully engaged, and determine the fan speed ratio based on the fan speed and idle speed.

[0133] The first control unit 200 is used to control the engine to increase from idle speed to a set speed.

[0134] The second processing unit 300 is used to control the disengagement of the electronically controlled silicone oil fan clutch when the engine is running at a set speed, and to obtain the disengagement performance parameters of the electronically controlled silicone oil fan clutch based on the fan speed.

[0135] The first detection unit 400 is used to detect separation faults in the electronically controlled silicone oil fan clutch based on separation performance parameters.

[0136] The third processing unit 500 is used to control the engagement of the electronically controlled silicone oil fan clutch when the engine is running at a set speed, and to obtain the engagement performance parameters of the electronically controlled silicone oil fan clutch based on the fan speed ratio.

[0137] The second detection unit 600 is used to detect engagement failures in the electronically controlled silicone oil fan clutch based on engagement performance parameters.

[0138] In this embodiment, the second processing unit 300 can be specifically used for:

[0139] When the engine is running at a set speed, a separation signal is output to the electronically controlled silicone oil fan clutch and a timer is started. The timer stops when the fan speed drops below the first set fan speed threshold, and the first timer duration and the first fan speed at the time of stopping the timer are obtained.

[0140] The first timing duration is determined as the disengagement time of the electronically controlled silicone oil fan clutch;

[0141] The speed of the first fan is determined as the separation speed.

[0142] In this embodiment, the first detection unit 400 can specifically be used for:

[0143] Determine whether the separation time meets the separation time threshold and whether the separation speed is stable within the set time.

[0144] If so, confirm that the electronically controlled silicone oil fan clutch has no disengagement fault;

[0145] If not, output the cause of the separation failure and the corresponding separation time and / or separation speed.

[0146] In this embodiment, the third processing unit 500 can be specifically used for:

[0147] When the engine is running at a set speed, an engagement signal is output to the electronically controlled silicone oil fan clutch and timing begins. Timing stops when the fan speed increases to a level greater than the second set fan speed threshold. The second timing duration and the second fan speed at which timing stops are obtained. The second set fan speed threshold is the product of the set percentage, the set speed, and the fan speed ratio.

[0148] The second timing duration is determined as the engagement time of the electronically controlled silicone oil fan clutch;

[0149] Based on the set rotational speed, fan speed ratio, and second fan speed, the slip ratio of the electronically controlled silicone oil fan clutch is determined.

[0150] In this embodiment, the second detection unit 600 can be specifically used for:

[0151] Determine whether the engagement time meets the engagement time threshold and whether the slip rate meets the slip rate threshold.

[0152] If so, confirm that the electronically controlled silicone oil fan clutch has no engagement fault;

[0153] If not, output the cause of the meshing failure and the corresponding meshing time and / or slip rate.

[0154] It should be noted that each embodiment focuses on describing the differences from other embodiments, and the same or similar parts between the embodiments can be referred to accordingly. For the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiments.

[0155] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0156] For ease of description, the above devices are described in terms of function, divided into various modules. Of course, in implementing this application, the functions of each module can be implemented in one or more software and / or hardware.

[0157] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0158] The above provides a detailed description of the method and apparatus for detecting faults in an electronically controlled silicone oil fan clutch. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and its core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for detecting faults in an electronically controlled silicone oil fan clutch, characterized in that, include: The electronic control unit of the vehicle under test responds to the test command and controls the electronically controlled silicone oil fan clutch to engage when the engine is running at idle speed, obtains the fan speed when the electronically controlled silicone oil fan clutch is fully engaged, and determines the fan speed ratio based on the fan speed and the idle speed. The electronic control unit controls the engine to increase its speed from the idle speed to a set speed. The electronic control unit controls the electronically controlled silicone oil fan clutch to disengage when the engine is running at a set speed, and obtains the disengagement performance parameters of the electronically controlled silicone oil fan clutch based on the fan speed. The electronic control unit performs separation fault detection on the electronically controlled silicone oil fan clutch based on the separation performance parameters; The electronic control unit controls the electronically controlled silicone oil fan clutch to output an engagement signal to the electronically controlled silicone oil fan clutch when the engine is running at a set speed, and starts timing. Timing stops when the fan speed increases to a level greater than a second set fan speed threshold, obtaining a second timing duration and a second fan speed at which timing stops. The second timing duration is determined as the engagement time of the electronically controlled silicone oil fan clutch. Based on the set speed, the fan speed ratio, and the second fan speed, the slip ratio of the electronically controlled silicone oil fan clutch is determined. The second set fan speed threshold is a set percentage, the product of the set speed and the fan speed ratio. The electronic control unit performs engagement fault detection on the electronically controlled silicone oil fan clutch based on the engagement time and the slip ratio.

2. The method according to claim 1, characterized in that, The electronic control unit controls the disengagement of the electronically controlled silicone oil fan clutch when the engine is running at a set speed. Based on the fan speed, the disengagement performance parameters of the electronically controlled silicone oil fan clutch are obtained, including: When the engine is running at a set speed, the electronic control unit outputs a separation signal to the electronically controlled silicone oil fan clutch and starts timing. When the fan speed drops below a first set fan speed threshold, the timing stops, and the first timing duration and the first fan speed at which the timing stops are obtained. The electronic control unit determines the first timing duration as the disengagement time of the electronically controlled silicone oil fan clutch; The electronic control unit determines the speed of the first fan as the separation speed.

3. The method according to claim 2, characterized in that, The electronic control unit performs separation fault detection on the electronically controlled silicone oil fan clutch based on the separation performance parameters, including: The electronic control unit determines whether the separation time meets the separation time threshold and whether the separation speed is stable within a set time. If so, the electronic control unit determines that the electronically controlled silicone oil fan clutch has no disengagement fault; If not, the electronic control unit outputs the cause of the separation failure and the corresponding separation time and / or separation speed.

4. The method according to claim 1, characterized in that, The electronic control unit performs engagement fault detection on the electronically controlled silicone oil fan clutch based on the engagement time and the slip ratio, including: The electronic control unit determines whether the engagement time meets the engagement time threshold and whether the slip rate meets the slip rate threshold. If so, the electronic control unit determines that the electronically controlled silicone oil fan clutch has no engagement fault; If not, the electronic control unit outputs the cause of the meshing failure and the meshing time and / or slip rate corresponding to the cause of the meshing failure.

5. A fault detection device for an electronically controlled silicone oil fan clutch, characterized in that, include: The first processing unit is used to respond to test commands, control the electronically controlled silicone oil fan clutch to engage when the engine is running at idle speed, obtain the fan speed when the electronically controlled silicone oil fan clutch is fully engaged, and determine the fan speed ratio based on the fan speed and the idle speed. The first control unit is used to control the engine to increase its speed from the idle speed to a set speed. The second processing unit is used to control the electronically controlled silicone oil fan clutch to disengage when the engine is running at a set speed, and to obtain the disengagement performance parameters of the electronically controlled silicone oil fan clutch based on the fan speed. The first detection unit is used to detect separation failures of the electronically controlled silicone oil fan clutch based on the separation performance parameters. The third processing unit is used to control the electronically controlled silicone oil fan clutch to output an engagement signal to the electronically controlled silicone oil fan clutch when the engine is running at a set speed, and to start timing. Timing stops when the fan speed increases to a level greater than a second set fan speed threshold. The unit obtains a second timing duration and a second fan speed at which timing stops, determines the second timing duration as the engagement time of the electronically controlled silicone oil fan clutch, and determines the slip ratio of the electronically controlled silicone oil fan clutch based on the set speed, the fan speed ratio, and the second fan speed. The second set fan speed threshold is a set percentage, the product of the set speed and the fan speed ratio. The second detection unit is used to detect engagement failures in the electronically controlled silicone oil fan clutch based on the engagement time and the slip ratio.

6. The apparatus according to claim 5, characterized in that, The second processing unit is specifically used for: When the engine is running at a set speed, a separation signal is output to the electronically controlled silicone oil fan clutch and a timer is started. The timer stops when the fan speed drops below a first set fan speed threshold, and the first timer duration and the first fan speed at which the timer stops are obtained. The first timing duration is determined as the disengagement time of the electronically controlled silicone oil fan clutch; The speed of the first fan is determined as the separation speed.

7. The apparatus according to claim 6, characterized in that, The first detection unit is specifically used for: Determine whether the separation time meets the separation time threshold and whether the separation speed is stable within a set duration; If so, it is confirmed that the electronically controlled silicone oil fan clutch has no disengagement fault; If not, output the cause of the separation failure and the corresponding separation time and / or separation speed.

8. The apparatus according to claim 5, characterized in that, The second detection unit is specifically used for: Determine whether the engagement time meets the engagement time threshold and whether the slip rate meets the slip rate threshold; If so, it is confirmed that the electronically controlled silicone oil fan clutch has no engagement fault; If not, output the cause of the meshing failure and the meshing time and / or slip rate corresponding to the cause of the meshing failure.

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