CN112987678A - PWM control type water pump fault diagnosis method and system and automobile - Google Patents

PWM control type water pump fault diagnosis method and system and automobile Download PDF

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Publication number
CN112987678A
CN112987678A CN201911279481.3A CN201911279481A CN112987678A CN 112987678 A CN112987678 A CN 112987678A CN 201911279481 A CN201911279481 A CN 201911279481A CN 112987678 A CN112987678 A CN 112987678A
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China
Prior art keywords
water pump
signal
diagnosis
pwm control
control type
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CN201911279481.3A
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Chinese (zh)
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CN112987678B (en
Inventor
马香明
潜磊
王金航
赵继岭
郭子涵
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GAC Aion New Energy Automobile Co Ltd
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Guangzhou Automobile Group Co Ltd
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Priority to CN201911279481.3A priority Critical patent/CN112987678B/en
Publication of CN112987678A publication Critical patent/CN112987678A/en
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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00Testing or monitoring of control systems or parts thereof
    • G05B23/02Electric testing or monitoring
    • G05B23/0205Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0218Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
    • G05B23/0221Preprocessing measurements, e.g. data collection rate adjustment; Standardization of measurements; Time series or signal analysis, e.g. frequency analysis or wavelets; Trustworthiness of measurements; Indexes therefor; Measurements using easily measured parameters to estimate parameters difficult to measure; Virtual sensor creation; De-noising; Sensor fusion; Unconventional preprocessing inherently present in specific fault detection methods like PCA-based methods

Abstract

The invention provides a PWM control type water pump fault diagnosis method, a system and an automobile, wherein the method comprises the steps of providing a PWM control type water pump power supply voltage signal; detecting signals of a driving port of the PWM control type water pump, wherein the signals of the driving port comprise a short circuit from the driving port to the ground, a short circuit from the driving port to a power supply and an open circuit from the driving port; judging whether the PWM control type water pump can be enabled or not according to a cooling flow signal requested by an engine, a cooling flow signal requested by a generator, a cooling flow signal requested by a power battery, a cooling flow signal requested by a charger and a cooling flow signal of a DCDC converter; if the PWM control type water pump can be enabled, acquiring the low level time of the duty ratio of the fault diagnosis fed back by the PWM control type water pump; and determining the type of the diagnosis signal according to the corresponding relation among the fault diagnosis duty ratio low level time, the fault diagnosis duty ratio low level time and the diagnosis signal type fed back by the PWM control type water pump. The invention solves the problem that the PWM control type water pump is lack of fault diagnosis means.

Description

PWM control type water pump fault diagnosis method and system and automobile
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to a PWM control type water pump fault diagnosis method and system and an automobile.
Background
In the existing new energy automobile, a Pulse Width Modulation (PWM) control type water pump is more and more widely applied. The common water pump reports the fault to the vehicle controller directly, and the PWM control type water pump does not have the functions. Whether the water pump normally operates or not is related to cooling of an engine, a motor, a power battery, a charger and a DCDC in the new energy automobile, and further the dynamic performance or the charging function of the whole automobile is influenced, so that a fault diagnosis means is lacked for the PWM control type water pump.
Disclosure of Invention
The invention aims to provide a PWM control type water pump fault diagnosis method, a system and an automobile, which are used for solving the problem that a PWM control type water pump is lack of fault diagnosis means.
The invention provides a PWM control type water pump fault diagnosis method, which comprises the following steps:
detecting a Pulse Width Modulation (PWM) control type water pump power supply voltage signal;
detecting signals of a driving port of the PWM control type water pump, wherein the signals of the driving port comprise a driving port short circuit to the ground, a driving port short circuit to a power supply and a driving port open circuit;
judging whether the PWM control type water pump can be enabled or not according to a cooling flow signal requested by an engine, a cooling flow signal requested by a generator, a cooling flow signal requested by a power battery, a cooling flow signal requested by a charger and a cooling flow signal of a DCDC converter;
if the PWM control type water pump can be enabled, acquiring the low level time of the fault diagnosis duty ratio fed back by the PWM control type water pump;
and determining the type of the diagnosis signal according to the fault diagnosis duty ratio low level time fed back by the PWM control type water pump, the corresponding relation between the fault diagnosis duty ratio low level time and the type of the diagnosis signal.
Further, the method further comprises:
and latching a fault corresponding to the drive port signal or the diagnosis signal type according to the drive port signal and the diagnosis signal type, and storing a fault code of the fault.
Further, the method further comprises:
and when the drive port signal abnormality and the diagnosis signal type abnormality are not detected in a plurality of preset continuous periods, clearing the latched fault and the latched fault code.
Further, the method further comprises:
and judging whether the PWM control type water pump stops operating or not according to the driving port signal, the diagnosis signal type and a water pump operation state table corresponding to the driving port signal and the diagnosis signal type.
The invention provides a PWM control type water pump fault diagnosis system, which comprises:
the first detection unit is used for detecting a PWM control type water pump power supply voltage signal;
the second detection unit is used for detecting signals of a driving port of the PWM control type water pump, wherein the signals of the driving port comprise a driving port short circuit to the ground, a driving port short circuit to a power supply and a driving port open circuit;
the first judgment unit is used for judging whether the PWM control type water pump can be enabled or not according to a cooling flow signal requested by an engine, a cooling flow signal requested by a generator, a cooling flow signal requested by a power battery, a cooling flow signal requested by a charger and a cooling flow signal of a DCDC converter;
the acquisition unit is used for acquiring the fault diagnosis duty ratio low-level time fed back by the PWM control type water pump when the PWM control type water pump can be enabled;
and the diagnosis unit is used for determining the type of the diagnosis signal according to the fault diagnosis duty ratio low level time fed back by the PWM control type water pump, the corresponding relation between the fault diagnosis duty ratio low level time and the type of the diagnosis signal.
Further, the system further comprises:
and the latch unit is used for latching the fault corresponding to the drive port signal or the diagnosis signal type according to the drive port signal and the diagnosis signal type and storing the fault code of the fault.
Further, the system further comprises:
and the unlocking unit is used for clearing the latched fault and the latched fault code when the drive port signal abnormality and the diagnosis signal type abnormality are not detected in a plurality of preset continuous periods.
Further, the system further comprises:
and the second judging unit is used for judging whether the PWM control type water pump stops running or not according to the driving port signal, the diagnosis signal type and a water pump running state table corresponding to the driving port signal and the diagnosis signal type.
The invention provides an automobile which comprises the PWM control type water pump fault diagnosis system.
The implementation of the invention has the following beneficial effects:
according to the invention, the low level time of the fault diagnosis duty ratio fed back by the PWM control type water pump is detected, the type of the diagnosis signal is determined, the fault of the water pump is determined, and the whole vehicle controller processes the fault according to the type of the diagnosis signal, so that the engine, the motor, the power battery, the charger and the DCDC work in a proper temperature range, the influence on the power performance or the charging function of the whole vehicle is avoided, and the problem that the PWM control type water pump is lack of fault diagnosis means is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a PWM-controlled water pump fault diagnosis method according to an embodiment of the present invention.
Fig. 2 is a structural diagram of a PWM-controlled water pump fault diagnosis system according to an embodiment of the present invention.
Detailed Description
In this patent, the type of the diagnostic signal is determined by the low level time of the duty cycle of the fault diagnosis, and the following describes the specific embodiment with reference to the drawings and the embodiments.
As shown in fig. 1, an embodiment of the present invention provides a PWM-controlled water pump fault diagnosis method, including:
and step S11, detecting a PWM control type water pump power supply voltage signal.
It should be noted that the PWM-controlled water pump is connected to the vehicle controller by a hard wire, and the vehicle controller first detects a power supply voltage signal of the PWM-controlled water pump to determine whether the power supply is normal.
And step S12, detecting the PWM control type water pump driving port signal.
It should be noted that the drive port signal includes a drive port short to ground, a drive port short to power, and a drive port open.
And step S13, judging whether the PWM control type water pump can be enabled or not according to the cooling flow signal requested by the engine, the cooling flow signal requested by the generator, the cooling flow signal requested by the power battery, the cooling flow signal requested by the charger and the cooling flow signal of the DCDC converter.
It should be noted that the PWM-controlled water pump is enabled if any one of the cooling flow rate signal requested by the engine, the cooling flow rate signal requested by the generator, the cooling flow rate signal requested by the power battery, the cooling flow rate signal requested by the charger, and the cooling flow rate signal of the DCDC converter is present.
And S14, if the PWM control type water pump can be enabled, acquiring the low level time of the duty ratio of the fault diagnosis fed back by the PWM control type water pump.
The vehicle control unit sends a fault diagnosis duty ratio signal to the PWM control type water pump, and the PWM control type water pump feeds back the fault diagnosis duty ratio signal to calculate or count the low level time of the fault diagnosis duty ratio.
And S15, determining the type of the diagnosis signal according to the fault diagnosis duty ratio low level time fed back by the PWM control type water pump, and the corresponding relation between the fault diagnosis duty ratio low level time and the type of the diagnosis signal.
Referring specifically to table 1, the left column in the table is the diagnostic signal type and the right column is the low time.
Diagnostic signal type Low level time (ms + -5%)
Is normal 500
Dry rotary kiln 1000
Locked rotor 1500
Over-temperature 2000
Under/over voltage 3000
Internal error 3500
TABLE 1
Further, the method further comprises:
and latching a fault corresponding to the drive port signal or the diagnosis signal type according to the drive port signal and the diagnosis signal type, and storing a fault code of the fault.
It should be noted that, for example, the drive port signal is a drive port short-circuited to ground, or the diagnostic signal type is dry-running, and the fault is latched and the fault code is stored.
Further, the method further comprises:
and when the drive port signal abnormality and the diagnosis signal type abnormality are not detected in a plurality of preset continuous periods, clearing the latched fault and the latched fault code.
Further, the method further comprises:
and judging whether the PWM control type water pump stops operating or not according to the driving port signal, the diagnosis signal type and a water pump operation state table corresponding to the driving port signal and the diagnosis signal type.
Water pump failure Operating state of water pump
Short-circuiting the drive port to ground Stop running
Drive port short to power supply Run in
Drive port open circuit Run in
Dry rotary kiln Stop running
Locked rotor Stop running
Over-temperature Stop running
Under/over voltage Stop running
Internal error Stop running
TABLE 2
Referring to table 2, the water pump fault is detected by the drive port signal, and also detected by the fault diagnosis duty ratio low level time, and according to the water pump running state table corresponding to the drive port signal and the diagnosis signal type, it can be judged whether the PWM control type water pump stops running.
As shown in fig. 2, an embodiment of the present invention provides a PWM-controlled water pump fault diagnosis system, including:
the first detection unit 21 is used for detecting a PWM control type water pump power supply voltage signal;
the second detection unit 22 is used for detecting signals of a driving port of the PWM control type water pump, wherein the signals of the driving port comprise a driving port short circuit to the ground, a driving port short circuit to a power supply and a driving port open circuit;
a first judging unit 23, configured to judge whether the PWM-controlled water pump can be enabled according to a cooling flow signal requested by an engine, a cooling flow signal requested by a generator, a cooling flow signal requested by a power battery, a cooling flow signal requested by a charger, and a cooling flow signal of a DCDC converter;
the acquiring unit 24 is used for acquiring the fault diagnosis duty ratio low-level time fed back by the PWM control type water pump when the PWM control type water pump is enabled;
and the diagnosis unit 25 is used for determining the type of the diagnosis signal according to the fault diagnosis duty ratio low level time fed back by the PWM control type water pump, the corresponding relation between the fault diagnosis duty ratio low level time and the type of the diagnosis signal.
Further, the system further comprises:
and the latch unit is used for latching the fault corresponding to the drive port signal or the diagnosis signal type according to the drive port signal and the diagnosis signal type and storing the fault code of the fault.
Further, the system further comprises:
and the unlocking unit is used for clearing the latched fault and the latched fault code when the drive port signal abnormality and the diagnosis signal type abnormality are not detected in a plurality of preset continuous periods.
Further, the system further comprises:
and the second judging unit is used for judging whether the PWM control type water pump stops running or not according to the driving port signal, the diagnosis signal type and a water pump running state table corresponding to the driving port signal and the diagnosis signal type.
The embodiment of the invention provides an automobile which comprises the PWM control type water pump fault diagnosis system.
The implementation of the invention has the following beneficial effects:
according to the invention, the low level time of the fault diagnosis duty ratio fed back by the PWM control type water pump is detected, the type of the diagnosis signal is determined, the fault of the water pump is determined, and the whole vehicle controller processes the fault according to the type of the diagnosis signal, so that the engine, the motor, the power battery, the charger and the DCDC work in a proper temperature range, the influence on the power performance or the charging function of the whole vehicle is avoided, and the problem that the PWM control type water pump is lack of fault diagnosis means is solved.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (9)

1. A PWM control type water pump fault diagnosis method is characterized by comprising the following steps:
s11, detecting a Pulse Width Modulation (PWM) control type water pump power supply voltage signal;
s12, detecting signals of a driving port of the PWM control type water pump, wherein the signals of the driving port comprise a driving port short circuit to the ground, a driving port short circuit to a power supply and a driving port open circuit;
s13, judging whether the PWM control type water pump can be enabled or not according to a cooling flow signal requested by an engine, a cooling flow signal requested by a generator, a cooling flow signal requested by a power battery, a cooling flow signal requested by a charger and a cooling flow signal of a DCDC converter;
s14, if the PWM control type water pump can be enabled, acquiring the low level time of the duty ratio of the fault diagnosis fed back by the PWM control type water pump;
and S15, determining the type of the diagnosis signal according to the fault diagnosis duty ratio low level time fed back by the PWM control type water pump, and the corresponding relation between the fault diagnosis duty ratio low level time and the type of the diagnosis signal.
2. The method of claim 1, wherein the method further comprises:
and latching a fault corresponding to the drive port signal or the diagnosis signal type according to the drive port signal and the diagnosis signal type, and storing a fault code of the fault.
3. The method of claim 2, wherein the method further comprises:
and when the drive port signal abnormality and the diagnosis signal type abnormality are not detected in a plurality of preset continuous periods, clearing the latched fault and the latched fault code.
4. The method of claim 1, wherein the method further comprises:
and judging whether the PWM control type water pump stops operating or not according to the driving port signal, the diagnosis signal type and a water pump operation state table corresponding to the driving port signal and the diagnosis signal type.
5. A PWM-controlled water pump fault diagnosis system, comprising:
the first detection unit is used for detecting a PWM control type water pump power supply voltage signal;
the second detection unit is used for detecting signals of a driving port of the PWM control type water pump, wherein the signals of the driving port comprise a driving port short circuit to the ground, a driving port short circuit to a power supply and a driving port open circuit;
the first judgment unit is used for judging whether the PWM control type water pump can be enabled or not according to a cooling flow signal requested by an engine, a cooling flow signal requested by a generator, a cooling flow signal requested by a power battery, a cooling flow signal requested by a charger and a cooling flow signal of a DCDC converter;
the acquisition unit is used for acquiring the fault diagnosis duty ratio low-level time fed back by the PWM control type water pump when the PWM control type water pump can be enabled;
and the diagnosis unit is used for determining the type of the diagnosis signal according to the fault diagnosis duty ratio low level time fed back by the PWM control type water pump, the corresponding relation between the fault diagnosis duty ratio low level time and the type of the diagnosis signal.
6. The system of claim 5, wherein the system further comprises:
and the latch unit is used for latching the fault corresponding to the drive port signal or the diagnosis signal type according to the drive port signal and the diagnosis signal type and storing the fault code of the fault.
7. The system of claim 6, wherein the system further comprises:
and the unlocking unit is used for clearing the latched fault and the latched fault code when the drive port signal abnormality and the diagnosis signal type abnormality are not detected in a plurality of preset continuous periods.
8. The system of claim 5, wherein the system further comprises:
and the second judging unit is used for judging whether the PWM control type water pump stops running or not according to the driving port signal, the diagnosis signal type and a water pump running state table corresponding to the driving port signal and the diagnosis signal type.
9. An automobile characterized by comprising the PWM-controlled water pump failure diagnosis system according to claims 5 to 8.
CN201911279481.3A 2019-12-13 2019-12-13 PWM control type water pump fault diagnosis method and system and automobile Active CN112987678B (en)

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Effective date of registration: 20211227

Address after: 511434 No. 36, Longying Road, Shilou Town, Panyu District, Guangzhou City, Guangdong Province

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Address before: 23rd floor, Chengyue building, No. 448-458, Dongfeng Middle Road, Yuexiu District, Guangzhou City, Guangdong Province 510030

Applicant before: GUANGZHOU AUTOMOBILE GROUP Co.,Ltd.

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