CN112677901B - Fault alarm output method of electromagnetic clutch of hybrid electric vehicle - Google Patents
Fault alarm output method of electromagnetic clutch of hybrid electric vehicle Download PDFInfo
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- CN112677901B CN112677901B CN201910988062.0A CN201910988062A CN112677901B CN 112677901 B CN112677901 B CN 112677901B CN 201910988062 A CN201910988062 A CN 201910988062A CN 112677901 B CN112677901 B CN 112677901B
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Abstract
The invention discloses a fault alarm output method of a hybrid electric vehicle electromagnetic clutch, which comprises the steps of driving an electromagnetic clutch coil with a set first target current value for combining the electromagnetic clutch, and driving the electromagnetic clutch coil with a set second target current value for keeping the electromagnetic clutch in a combined state; and simultaneously, detecting the current value in the constant current driving loop of the electromagnetic clutch coil in real time, and if the constant current driving loop is determined to be in a fault state according to the current value detected in real time, cutting off the current of the electromagnetic clutch coil and outputting fault alarm information. According to the fault alarm output method of the electromagnetic clutch of the hybrid electric vehicle, a driver can determine that the electromagnetic clutch is in a fault state in real time, psychological preparation is provided for acceleration performance reduction caused by loss of motor assistance, and accidents and discomfort caused by inconsistent acceleration effect and expectation are avoided.
Description
Technical Field
The invention relates to a fault alarm output method, in particular to a fault alarm output method of an electromagnetic clutch of a hybrid electric vehicle.
Background
In the prior art, a driver cannot know the faults of an electromagnetic clutch coil in a hybrid electric vehicle in real time. So that in the event of a failure of the electromagnetic clutch, a rapid acceleration action is still taken.
However, since failure of the electromagnetic clutch causes no motor assist, the acceleration performance of the vehicle is instantaneously reduced, and thus accidents are extremely likely to occur.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a fault alarm output method of an electromagnetic clutch of a hybrid electric vehicle.
The invention relates to a fault alarm output method of a hybrid electric vehicle electromagnetic clutch, which drives an electromagnetic clutch coil with a set first target current value for combining the electromagnetic clutch and,
driving the electromagnetic clutch coil at a set second target current value for maintaining the electromagnetic clutch in the engaged state;
and simultaneously, detecting the current value in the constant current driving loop of the electromagnetic clutch coil in real time, and if the constant current driving loop is determined to be in a fault state according to the current value detected in real time, cutting off the current of the electromagnetic clutch coil and outputting fault alarm information.
In the fault alarm output method of the electromagnetic clutch of the hybrid electric vehicle, if the current value of the coil of the electromagnetic clutch is smaller than the preset minimum threshold value, the constant current driving loop is determined to be in an open fault state;
and if the current value of the electromagnetic clutch coil is larger than the preset highest threshold value, determining that the constant current driving loop is in a short circuit fault state.
In the fault alarm output method of the electromagnetic clutch of the hybrid electric vehicle, the constant current driving loop of the electromagnetic clutch coil comprises a current sensor, a current driver, a PWM control module, an A/D conversion module, a fault diagnosis module and a comprehensive calculation processing module;
the current sensor detects a driving current value currently output by the current driver, converts the detected driving current value through the A/D conversion module and then transmits the driving current value to the fault diagnosis module, and the fault diagnosis module judges whether the driving current value is in a preset threshold value interval or not;
if the driving current value is in a preset threshold value interval, comparing the driving current value with the first target current value or the second target current value by the comprehensive calculation processing module according to the current state of the electromagnetic clutch, and sending a corresponding control instruction to the PWM control module according to a comparison result;
the PWM control module adjusts a driving current value output by the current driver according to the received control instruction;
and if the driving current value is not within the preset threshold value interval, cutting off the coil current of the electromagnetic clutch and outputting fault alarm information.
The invention relates to a fault alarm output method of a hybrid electric vehicle electromagnetic clutch, which also comprises a fault indicator lamp;
the fault indicator lamp is arranged at the output end of the fault diagnosis module and is lightened after receiving fault alarm information so as to remind a driver.
According to the fault alarm output method of the electromagnetic clutch of the hybrid electric vehicle, a driver can determine that the electromagnetic clutch is in a fault state in real time, psychological preparation is provided for acceleration performance reduction caused by loss of motor assistance, and accidents and discomfort caused by inconsistent acceleration effect and expectation are avoided.
Drawings
Fig. 1 is a schematic diagram of a structure of an electromagnetic clutch coil constant current driving loop in a fault alarm output method of an electromagnetic clutch of a hybrid electric vehicle.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
In the fault alarm output method of the electromagnetic clutch of the hybrid electric vehicle, the electromagnetic clutch is driven in a constant-current mode. That is, the electromagnetic clutch coil is driven at a first target current value set to cause the electromagnetic clutch to be engaged, and the electromagnetic clutch coil is driven at a second target current value set to cause the electromagnetic clutch to remain engaged; and simultaneously, detecting the current value in the constant current driving loop of the electromagnetic clutch coil in real time, and if the constant current driving loop is determined to be in a fault state according to the current value detected in real time, cutting off the current of the electromagnetic clutch coil and outputting fault alarm information.
The state of the electromagnetic clutch can be classified into an engaged state and a disengaged state. The electromagnetic clutch is required to be driven with a first target current value in the transition process from the separation state to the combination state; and is driven at a second target current value after the electromagnetic clutch is reliably engaged. That is, in order to obtain the maximum electromagnetic thrust force of the electromagnetic clutch coil at the initial engagement stage of the electromagnetic clutch to ensure reliable engagement of the electromagnetic clutch, a first target current value is set, and the electromagnetic clutch coil is driven at the first target current value to engage the electromagnetic clutch.
Further, a second target current value is set, which is significantly smaller than the first target current value, and the electromagnetic clutch coil is driven at the set second target current value, so that the electromagnetic clutch is kept in a coupled state. This is because, when the electromagnetic clutch is engaged, the driving current can be appropriately reduced to maintain the engaged state of the electromagnetic clutch, and it is possible to reduce the energy loss and control the temperature rise of the electromagnetic clutch coil. However, as the temperature of the electromagnetic clutch coil increases, the resistance of the electromagnetic clutch coil increases, and the drive current decreases. At this time, the driving current can be kept constant by adjusting the driving current, so that the reliable combination of the electromagnetic clutch is ensured.
The first target current value referred to in the present invention means a current value required to ensure that the electromagnetic clutch coil generates a sufficient thrust, and is also a maximum current value that can be obtained in general, and the first target current value is 3.5 amperes or more assuming that the resistance of the electromagnetic clutch coil is 3.4 ohms. The second target current value mentioned in the present invention is the minimum current value that keeps the electromagnetic clutch reliably engaged, and in practical tests, it is typically 2.4 amperes.
In the invention, the electromagnetic clutch coil is driven with constant current according to the working state of the electromagnetic clutch by adopting two set target current values, the power consumption of the electromagnetic clutch coil is reduced, the temperature rise of the electromagnetic clutch coil is slowed down, and the highest temperature of the electromagnetic clutch coil is also reduced. Therefore, the service life of the electromagnetic clutch coil is prolonged and the failure rate of the electromagnetic clutch coil is reduced while the reliable combination of the electromagnetic clutch is ensured.
On the premise of the constant current driving, in order to enable a driver to know the working state of the electromagnetic clutch in real time, particularly to know the working state immediately when the electromagnetic clutch fails, the current value in the coil constant current driving circuit of the electromagnetic clutch is detected in real time, and if the constant current driving circuit is determined to be in a failure state according to the current value detected in real time, the coil current of the electromagnetic clutch is cut off, and failure warning information is output. For a driver, the electromagnetic clutch can be determined to be in a fault state in real time, psychological preparation is provided for acceleration performance reduction caused by losing motor assistance, and accidents and discomfort caused by inconsistent acceleration effect and expectation are avoided.
Specifically, the fault state may be divided into two types, one being an open fault state and one being a short fault state. That is, if the current value of the electromagnetic clutch coil is smaller than the preset minimum threshold value, determining that the constant current driving loop is in an open-circuit fault state; and if the current value of the electromagnetic clutch coil reaches a preset highest threshold value, determining that the constant current driving loop is in a short circuit fault state. The duty ratio of the PWM control signal at this time is lower than a predetermined set value. The smaller the load resistance is, the smaller the duty ratio of the PWM control signal driven by the constant current is, and when the duty ratio is smaller to a set value, the load can be judged to be in a short circuit state.
Fig. 1 is a schematic diagram of a structure of an electromagnetic clutch coil constant current driving circuit in a fault alarm output method of an electromagnetic clutch of a hybrid electric vehicle according to the present invention. The constant-current driving loop of the electromagnetic clutch coil comprises a current sensor, a current driver, a PWM control module, an A/D conversion module, a fault diagnosis module and a comprehensive calculation processing module.
The current sensor detects a driving current value currently output by the current driver, converts the detected driving current value through the A/D conversion module and then transmits the driving current value to the fault diagnosis module, and the fault diagnosis module judges whether the driving current value is in a preset threshold value interval or not.
If the driving current value is in the preset threshold value interval, the comprehensive calculation processing module compares the driving current value with the first target current value (if the driving current value is in the initial combination stage) or the second target current value (if the driving current value is in the combination stage) according to the current state of the electromagnetic clutch (namely, the current state is in the initial combination stage or the combination state), and sends a corresponding control instruction to the PWM control module according to the comparison result. The PWM control module adjusts the driving current value output by the current driver according to the received control instruction, so that the driving current value output by the current driver at the moment can be as close to the first target current value (if in an initial combination stage) or the second target current value (if in a combination state) as possible.
And if the driving current value is not within the preset threshold value interval, cutting off the coil current of the electromagnetic clutch and outputting fault alarm information. According to the above, if the current value of the electromagnetic clutch coil reaches the preset highest threshold value, the constant current driving circuit is determined to be in a short circuit fault state.
In order to meet the requirement of outputting fault alarm information, the invention also provides a fault indicator lamp which is arranged at the output end of the fault diagnosis module and is lightened after receiving the fault alarm information so as to remind a driver.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (3)
1. A fault alarm output method of electromagnetic clutch of hybrid electric vehicle is characterized by that the electromagnetic clutch coil is driven by the first target current value set for combining electromagnetic clutch and,
driving the electromagnetic clutch coil at a set second target current value for maintaining the electromagnetic clutch in the engaged state;
the constant-current driving loop of the electromagnetic clutch coil comprises a current sensor, a current driver, a PWM control module, an A/D conversion module, a fault diagnosis module and a comprehensive calculation processing module;
the current sensor detects a driving current value currently output by the current driver in real time, converts the detected driving current value through the A/D conversion module and then transmits the driving current value to the fault diagnosis module, and the fault diagnosis module judges whether the driving current value is in a preset threshold value interval or not;
if the driving current value is in a preset threshold value interval, comparing the driving current value with the first target current value or the second target current value by the comprehensive calculation processing module according to the current state of the electromagnetic clutch, and sending a corresponding control instruction to the PWM control module according to a comparison result;
the PWM control module adjusts the driving current value output by the current driver according to the received control instruction so as to enable the driving current value output by the current driver to be close to the first target current value or the second target current value;
and if the driving current value is not in the preset threshold value interval, determining that the constant current driving loop is in a fault state, namely cutting off the coil current of the electromagnetic clutch, and outputting fault alarm information.
2. The fault alert output method for an electromagnetic clutch of a hybrid vehicle according to claim 1, wherein if the current value of the electromagnetic clutch coil is less than a preset minimum threshold value, it is determined that the constant current driving loop is in an open fault state;
and if the current value of the electromagnetic clutch coil is larger than the preset highest threshold value, determining that the constant current driving loop is in a short circuit fault state.
3. The fault alert output method for an electromagnetic clutch of a hybrid vehicle as claimed in claim 1, further comprising a fault indicator lamp;
the fault indicator lamp is arranged at the output end of the fault diagnosis module and is lightened after receiving fault alarm information so as to remind a driver.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910988062.0A CN112677901B (en) | 2019-10-17 | 2019-10-17 | Fault alarm output method of electromagnetic clutch of hybrid electric vehicle |
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| CN201910988062.0A CN112677901B (en) | 2019-10-17 | 2019-10-17 | Fault alarm output method of electromagnetic clutch of hybrid electric vehicle |
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| CN110228461A (en) * | 2019-06-18 | 2019-09-13 | 吉林大学 | A kind of CVT parallel hybrid electric pattern switching segmentation control method for coordinating |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3871849B2 (en) * | 2000-04-03 | 2007-01-24 | 本田技研工業株式会社 | Failure determination device for electromagnetic clutch |
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- 2019-10-17 CN CN201910988062.0A patent/CN112677901B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009174608A (en) * | 2008-01-23 | 2009-08-06 | Yazaki Corp | Control device of electromagnetic clutch |
| CN101624051A (en) * | 2009-08-03 | 2010-01-13 | 奇瑞汽车股份有限公司 | Externally connected rechargeable hybrid power vehicle hardware system and control method thereof |
| CN105899748A (en) * | 2013-10-29 | 2016-08-24 | 爱信精机株式会社 | Controlling device and control method for vehicle opening and closing body and vehicle opening and closing body comprising same controlling device |
| CN108860012A (en) * | 2017-05-16 | 2018-11-23 | 福特全球技术公司 | The starting of vehicle power relay controls and diagnosis |
| CN107387599A (en) * | 2017-09-12 | 2017-11-24 | 安徽江淮汽车集团股份有限公司 | The half hitch chalaza self-learning method of wet dual-clutch automatic transmission |
| CN110040083A (en) * | 2018-01-16 | 2019-07-23 | 宝沃汽车（中国）有限公司 | Condition detection method, device, cloud server and the vehicle of clutch oil |
| CN108843704A (en) * | 2018-08-24 | 2018-11-20 | 东风襄阳旅行车有限公司 | Vehicular clutch control mechanism and means of defence based on voice coil motor driving |
| CN110228461A (en) * | 2019-06-18 | 2019-09-13 | 吉林大学 | A kind of CVT parallel hybrid electric pattern switching segmentation control method for coordinating |
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