CN113320398B - Whole vehicle flameout working condition driving motor protection method, module and system - Google Patents

Whole vehicle flameout working condition driving motor protection method, module and system Download PDF

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Publication number
CN113320398B
CN113320398B CN202110702402.6A CN202110702402A CN113320398B CN 113320398 B CN113320398 B CN 113320398B CN 202110702402 A CN202110702402 A CN 202110702402A CN 113320398 B CN113320398 B CN 113320398B
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motor
state
ignition signal
whole vehicle
protection
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CN113320398A (en
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王海彬
刘志明
梁晓明
王偊霄
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United Automotive Electronic Systems Co Ltd
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United Automotive Electronic Systems Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0084—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to control modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/42—Drive Train control parameters related to electric machines
    • B60L2240/421—Speed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

Abstract

The invention discloses a protection method for a driving motor under flameout condition of a whole vehicle, which comprises the following steps: detecting ignition signals of the whole vehicle in real time; if the preset excitation signal is detected, the state detection module is powered intermittently at a preset frequency through the vehicle body controller, and the state of the motor is acquired; and performing motor protection according to the motor state. The invention also discloses a whole vehicle flameout condition driving state detection module and a whole vehicle flameout condition driving motor protection system. The invention can ensure the detection of the motor state in the flameout state of the whole vehicle, can avoid the power shortage of the low-voltage power supply caused by excessive electric appliances, effectively screens the abnormal working condition of the driving motor and timely gives an alarm to the outside through the protection strategy in the flameout state of the whole vehicle, can effectively avoid the damage of the motor system caused by improper operation when the trailer is used, and improves the safety of the new energy automobile.

Description

Whole vehicle flameout working condition driving motor protection method, module and system
Technical Field
The invention relates to the field of automobiles, in particular to a protection method for a driving motor for a flameout condition of a whole automobile of a new energy automobile, a detection module for the driving state of the flameout condition of the whole automobile and a protection system for the driving motor for the flameout condition of the whole automobile.
Background
The new energy automobile industry is rapidly developed, and electric automobiles play an increasingly important role in daily life of people. The driving motor system is called as the heart of the electric automobile, and converts electric energy into mechanical energy to drive the automobile to run by means of accurate regulation and control of a motor controller, so that the driving motor system is the only power device of the pure electric automobile. Compared with other types of motors, the permanent magnet synchronous motor has the characteristics of small volume, high power density, high reliability, high response speed and the like, and the current use ratio in new energy automobiles in China exceeds 90 percent, so that the permanent magnet synchronous motor becomes the main stream of the current electric drive market.
The rapid development of electric vehicles also exposes more and more problems. Compared with a fuel oil vehicle, the transmission system of the electric vehicle is greatly simplified, and the failure rate is reduced; at the same time, however, some problems and malfunctions specific to electric vehicles also occur. Under normal conditions, when the automobile cannot continue running due to faults, a driver stops the automobile after the automobile is placed in a neutral gear, the fault automobile is towed off the scene by a trailer, and at the moment, the fault automobile is in a trailer working condition, and all control systems of the whole automobile do not work. Unlike fuel vehicles, electric vehicles generally employ a direct connection between a driving motor and a speed reducer and a transmission shaft, and a transmission system of the electric vehicle is not separated after a driver is in neutral gear. For an electric vehicle adopting a permanent magnet synchronous motor as a driving scheme, when the electric vehicle is in a trailer working condition, a motor rotor continuously cuts a magnetic induction line along with the rotation of wheels, induced electromotive force, namely so-called back electromotive force, is generated in a motor stator, and the faster the vehicle speed is, the higher the back electromotive force measured by three-phase terminals of the motor stator is. At this time, the whole vehicle is in flameout and power-off state, and the motor controller does not work, so that the back electromotive force of the motor directly acts on the power element of the motor controller, and harmful results possibly caused by the back electromotive force include:
1. as shown in fig. 1, when the controller is in the freewheel state, the motor controller power module switch IGBT is all turned off, and the induced electromotive force (sinusoidal ac voltage) generated in the motor stator will make the dc side capacitor and IGBT in the controller in a high voltage state, so that the controller is at risk of breakdown by high voltage. 2. As shown in fig. 2, when the controller is in ASC state, the upper three-bridge of the power module switch IGBT of the motor controller is in off state, the lower three-bridge is closed, the motor controller is continuously and passively discharged, and the heat generated in the process cannot be dissipated (the whole vehicle power-off cooling system does not work) to cause the thermal damage of the controller element.
Disclosure of Invention
In the summary section, a series of simplified form concepts are introduced that are all prior art simplifications in the section, which are described in further detail in the detailed description section. The summary of the invention is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
The invention aims to provide a driving motor protection method under the flameout condition of a whole vehicle.
The invention aims to provide a driving state detection module for flameout conditions of a whole vehicle.
The invention aims to provide a driving motor protection system under the flameout condition of the whole vehicle.
In order to solve the technical problems, the method for protecting the driving motor under the flameout condition of the whole vehicle provided by the invention comprises the following steps:
s1, detecting ignition signals of the whole vehicle in real time;
s2, if a preset excitation signal is detected, intermittently supplying power to a state detection module through a vehicle body controller at a preset frequency and collecting the state of a motor;
and S3, executing motor protection according to the motor state.
Optionally, the protection method of the driving motor under the flameout condition of the whole vehicle is further improved, and the preset excitation signal is a negative excitation signal generated by converting the ignition signal of the whole vehicle from a high level to a low level.
Optionally, the protection method of the driving motor for the flameout condition of the whole vehicle is further improved, and the motor state comprises: ignition signal voltage and motor speed, and the motor is operated at the ignition signal voltage and motor speed for a duration.
Optionally, the protection method of the driving motor for the flameout condition of the whole vehicle is further improved, and the motor protection comprises:
A. the ignition signal voltage V range is: v1 is more than or equal to V2, and no protection operation is executed;
B. the ignition signal voltage V range is: v is less than V1, the motor rotating speed is 0, and no protection operation is executed;
C. the ignition signal voltage V range is: v < V1, motor speed RP ranges are: RP1 is less than or equal to RP2, and the duration T ranges from: t1 is less than or equal to T2 minutes, and no protection operation is executed;
D. the voltage range of the ignition signal is V < V1, and the rotating speed range of the motor is as follows: RP1 is less than or equal to RP2, and the duration T ranges from: t1 is less than or equal to T, and an alarm is output;
E. the voltage range of the ignition signal is V < V1, and the rotating speed range of the motor is as follows: RP2 is less than or equal to RP, and outputting an alarm;
v1 and V2 are voltage values specified according to motor performance, T1 and T2 are time periods specified according to motor performance, and RP1 and RP2 are rotating speeds specified according to motor performance.
In order to solve the technical problems, the invention provides a detection module for a flameout condition driving state of a whole vehicle, comprising:
the output end of the logic unit is connected with the input end of the motor position sensor, and the two input ends of the logic unit are respectively connected with the ignition signal of the whole vehicle and the output end of the controllable switch;
the input end of the control unit receives the command of the vehicle body controller, and the output end of the control unit is connected with the control end of the controllable switch to control the on-off of the controllable switch;
and the other input end of the controllable switch is connected with the output voltage of the vehicle body controller.
Optionally, the detection module of the flameout condition driving state of the whole vehicle is further improved, and the control unit receives an instruction of the vehicle body controller to enable the controllable switch to intermittently switch on and off at preset frequency to supply power to the motor position sensor.
In order to solve the technical problems, the invention provides a vehicle flameout condition driving motor protection system of the vehicle flameout condition driving state detection module, comprising:
the motor signal acquisition module is used for acquiring motor rotation speed signals, decoding the motor rotation speed signals and then transmitting the motor rotation speed signals to the vehicle body controller;
the state detection module is used for receiving an instruction of the vehicle body controller by the receiving end to supply power to the motor position sensor;
and the vehicle body controller is used for detecting a preset excitation signal, outputting an instruction to supply power for the motor position sensor and collecting a motor state at the same time, and executing motor protection by the motor state.
Optionally, the protection system of the driving motor under the flameout condition of the whole vehicle is further improved, and the preset excitation signal is a negative excitation signal generated by converting the ignition signal of the whole vehicle from a high level to a low level.
Optionally, the protection system of the driving motor under the flameout condition of the whole vehicle is further improved, and the output instruction is a preset frequency intermittent on-off instruction of the controllable switch.
Optionally, the protection system of the driving motor for flameout condition of the whole vehicle is further improved, and the motor protection comprises:
A. the ignition signal voltage V range is: v1 is more than or equal to V2, and no protection operation is executed;
B. the ignition signal voltage V range is: v is less than V1, the motor rotating speed is 0, and no protection operation is executed;
C. the ignition signal voltage V range is: v < V1, motor speed RP ranges are: RP1 is less than or equal to RP2, and the duration T ranges from: t1 is less than or equal to T2 minutes, and no protection operation is executed;
D. the voltage range of the ignition signal is V < V1, and the rotating speed range of the motor is as follows: RP1 is less than or equal to RP2, and the duration T ranges from: t1 is less than or equal to T, and an alarm is output;
E. the voltage range of the ignition signal is V < V1, and the rotating speed range of the motor is as follows: RP2 is less than or equal to RP, and outputting an alarm;
v1 and V2 are voltage values specified according to motor performance, T1 and T2 are time periods specified according to motor performance, and RP1 and RP2 are rotating speeds specified according to motor performance.
The working principle of the invention is as follows:
when the whole vehicle normally works, the motor signal acquisition module (comprising a motor position sensor and a decoding chip) is powered by the whole vehicle ignition signal circuit KL15, at the moment, the ignition signal KL15 is detected by the vehicle body controller BCM, the whole vehicle is judged to be in a working state, and the control unit does not work.
When the whole vehicle is in a flameout state, an ignition signal KL15 is changed from high level to low level, a vehicle body controller BCM detects negative excitation generated by the KL15, an activation control unit sends intermittent pulses to a controllable switch, and meanwhile, the vehicle body controller BCM (the vehicle body controller is powered by a vehicle-mounted storage battery) supplies power to the controllable switch; the control unit conducts the controllable switch at a fixed frequency, so that intermittent power supply to the motor signal acquisition module in the flameout state of the whole vehicle is realized, and a motor state signal generated by the motor signal acquisition module is transmitted to the vehicle body controller BCM. Therefore, the detection of the motor state in the flameout state of the whole vehicle can be ensured, and the power shortage of the low-voltage power supply caused by excessive electric appliances can be avoided.
According to the invention, the abnormal working condition of the driving motor can be effectively screened through the protection strategy in the flameout state of the whole vehicle, and when the vehicle body controller BCM judges that the failure risk exists in the motor controller, an alarm can be timely sent to the outside (for example, through the whole vehicle buzzer), so that the damage of a motor system caused by improper operation during the trailer can be effectively avoided, and the safety of a new energy automobile is improved. It should be noted that, the state detection module is integrated with the hardware of the electric drive axle, and can completely implement its function by using the hardware in the prior art, without needing to design a special module.
Drawings
The accompanying drawings are intended to illustrate the general features of methods, structures and/or materials used in accordance with certain exemplary embodiments of the invention, and supplement the description in this specification. The drawings of the present invention, however, are schematic illustrations that are not to scale and, thus, may not be able to accurately reflect the precise structural or performance characteristics of any given embodiment, the present invention should not be construed as limiting or restricting the scope of the numerical values or attributes encompassed by the exemplary embodiments according to the present invention. The invention is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a schematic diagram of a vehicle body controller high pressure risk.
FIG. 2 is a schematic diagram of a body controller thermal runaway risk.
Fig. 3 is a schematic diagram of a driving state detection module for flameout conditions of the whole vehicle.
Fig. 4 is a schematic diagram of a motor signal acquisition module.
Fig. 5 is a schematic diagram of a protection system for a driving motor under flameout condition of a whole vehicle.
Detailed Description
Other advantages and technical effects of the present invention will become more fully apparent to those skilled in the art from the following disclosure, which is a detailed description of the present invention given by way of specific examples. The invention may be practiced or carried out in different embodiments, and details in this description may be applied from different points of view, without departing from the general inventive concept. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. The following exemplary embodiments of the present invention may be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. It should be appreciated that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the technical solution of these exemplary embodiments to those skilled in the art.
It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present. Like reference numerals refer to like elements throughout the several views. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Other words used to describe relationships between elements or layers (e.g., "between … …" and "directly between … …", "adjacent … …" and "directly adjacent … …", "on … …" and "directly on … …", etc.) should be interpreted in the same manner.
A first embodiment;
the invention provides a protection method for a driving motor under flameout condition of a whole vehicle, which comprises the following steps:
s1, detecting ignition signals of the whole vehicle in real time;
s2, if a preset excitation signal is detected, intermittently supplying power to a state detection module through a vehicle body controller at a preset frequency and collecting the state of a motor;
and S3, executing motor protection according to the motor state.
In the first embodiment, whether the whole vehicle works normally is determined by detecting the ignition signal of the whole vehicle in real time. When the whole vehicle is in a flameout state, namely after an excitation signal is detected, the vehicle body controller supplies power to the state detection module and acquires the state of the motor intermittently at a preset frequency, so that intermittent power supply to the motor and motor state acquisition under the flameout state of the whole vehicle are realized. And executing motor protection according to the collected motor state. Therefore, the detection of the motor state in the flameout state of the whole vehicle can be ensured, and the power shortage of the low-voltage power supply caused by excessive electric appliances can be avoided. And moreover, the state of the driving motor under the unconventional working condition can be effectively screened through a protection strategy under the flameout state of the whole vehicle, and an alarm can be timely sent to the outside, so that the damage of a motor system caused by improper operation during the trailer can be effectively avoided, and the safety of the new energy automobile is improved.
A second embodiment;
the invention provides a protection method for a driving motor under flameout condition of a whole vehicle, which comprises the following steps:
s1, detecting ignition signals of the whole vehicle in real time;
s2, if a negative excitation signal generated by converting a whole vehicle ignition signal from a high level to a low level is detected, intermittently supplying power to a state detection module through a vehicle body controller at a preset frequency and collecting the state of a motor; the motor state includes: the ignition signal voltage and the motor rotating speed, and the duration of the motor working at the ignition signal voltage and the motor rotating speed;
s3, executing motor protection according to the motor state, including:
A. the ignition signal voltage V range is: v1 is more than or equal to V2, and no protection operation is executed;
B. the ignition signal voltage V range is: v is less than V1, the motor rotating speed is 0, and no protection operation is executed;
C. the ignition signal voltage V range is: v < V1, motor speed RP ranges are: RP1 is less than or equal to RP2, and the duration T ranges from: t1 is less than or equal to T2 minutes, and no protection operation is executed;
D. the voltage range of the ignition signal is V < V1, and the rotating speed range of the motor is as follows: RP1 is less than or equal to RP2, and the duration T ranges from: t1 is less than or equal to T, and an alarm is output;
E. the voltage range of the ignition signal is V < V1, and the rotating speed range of the motor is as follows: RP2 is less than or equal to RP, and outputting an alarm;
v1 and V2 are voltage values appointed according to motor performance, T1 and T2 are duration appointed according to motor performance, and RP1 and RP2 are rotating speeds appointed according to motor performance;
exemplary:
v1 is 0 < V1.ltoreq.5.9V, V1 is preferably 5.9V;
v2 is 5.9V < V2.ltoreq.16V, V2 is preferably 16V;
RP1 ranges from 0rpm to 1rpm, and RP1 is preferably 1rpm;
RP2 ranges from 4000rpm to 5000rpm, RP2 preferably being 5000rpm;
t1 is in the range of 0 minutes to 1 minutes, T1 is preferably 0 minutes;
t2 is in the range of 10 minutes.ltoreq.T1.ltoreq.15 minutes, T2 preferably being 15 minutes.
A third embodiment;
as shown in fig. 3, the present invention provides a detection module for driving status of flameout condition of a whole vehicle, including:
the output end of the logic unit is connected with the input end of the motor position sensor, and the two input ends of the logic unit are respectively connected with the ignition signal of the whole vehicle and the output end of the controllable switch;
the input end of the control unit receives the command of the vehicle body controller, and the output end of the control unit is connected with the control end of the controllable switch to control the on-off of the controllable switch;
the other input end of the controllable switch is connected with the output voltage of the vehicle body controller;
the control unit receives an instruction of the vehicle body controller to enable the controllable switch to be intermittently switched on and off at preset frequency to supply power to the motor position sensor.
The logic unit selects an OR gate circuit, the control unit selects a pulse generator, the controllable switch selects a triode, the collector is connected with the vehicle body controller, the base is connected with the output end of the pulse generator, and the emitter is connected with one input end of the OR gate circuit.
A fourth embodiment;
referring to fig. 3 to 5, the present invention provides a protection system for a driving motor for flameout conditions of a vehicle, including:
the motor signal acquisition module is used for acquiring motor rotation speed signals, decoding the motor rotation speed signals and then transmitting the motor rotation speed signals to the vehicle body controller;
the state detection module is used for receiving an instruction of the vehicle body controller by the receiving end to supply power to the motor position sensor;
and the vehicle body controller is used for detecting a preset excitation signal, outputting a preset frequency intermittent on-off instruction to supply power to the motor position sensor and collecting the motor state at the same time, wherein the motor state performs motor protection, and the preset excitation signal is a negative excitation signal generated by converting a whole vehicle ignition signal from a high level to a low level.
A fifth embodiment;
3-5, the invention provides a protection system for a driving motor for a flameout condition of a whole vehicle, which comprises the following components:
the motor signal acquisition module is used for acquiring motor rotation speed signals, decoding the motor rotation speed signals and then transmitting the motor rotation speed signals to the vehicle body controller;
the state detection module is used for receiving an instruction of the vehicle body controller by the receiving end to supply power to the motor position sensor;
the vehicle body controller is used for detecting a preset excitation signal, outputting an intermittent on-off instruction with preset frequency to supply power to the motor position sensor and collecting the motor state at the same time, wherein the motor state performs motor protection, and the preset excitation signal is a negative excitation signal generated by converting a whole vehicle ignition signal from a high level to a low level;
the motor protection includes:
A. the ignition signal voltage V range is: v1 is more than or equal to V2, and no protection operation is executed;
B. the ignition signal voltage V range is: v is less than V1, the motor rotating speed is 0, and no protection operation is executed;
C. the ignition signal voltage V range is: v < V1, motor speed RP ranges are: RP1 is less than or equal to RP2, and the duration T ranges from: t1 is less than or equal to T2 minutes, and no protection operation is executed;
D. the voltage range of the ignition signal is V < V1, and the rotating speed range of the motor is as follows: RP1 is less than or equal to RP2, and the duration T ranges from: t1 is less than or equal to T, and an alarm is output;
E. the voltage range of the ignition signal is V < V1, and the rotating speed range of the motor is as follows: RP2 is less than or equal to RP, and outputting an alarm;
v1 and V2 are voltage values appointed according to motor performance, T1 and T2 are duration appointed according to motor performance, and RP1 and RP2 are rotating speeds appointed according to motor performance;
the motor signal acquisition module comprises a position sensor integrated in the motor and a decoding chip for decoding the signal of the position sensor, and the alarm can be selectively output through a vehicle-mounted buzzer;
v1 is 0 < V1.ltoreq.5.9V, V1 is preferably 5.9V;
v2 is 5.9V < V2.ltoreq.16V, V2 is preferably 16V;
RP1 ranges from 0rpm to 1rpm, and RP1 is preferably 1rpm;
RP2 ranges from 4000rpm to 5000rpm, RP2 preferably being 5000rpm;
t1 is in the range of 0 minutes to 1 minutes, T1 is preferably 0 minutes;
t2 is in the range of 10 minutes.ltoreq.T1.ltoreq.15 minutes, T2 preferably being 15 minutes.
Also, the above-described exemplary embodiments are only exemplary, and the present invention can realize protection of the motor as long as the vehicle is not in an ignition state (including active flameout or passive flameout). For example, the parking function is accidentally disabled, and the whole vehicle is in sliding after being powered off, and the technical scheme of the invention can give an alarm in time to inform a driver.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The present invention has been described in detail by way of specific embodiments and examples, but these should not be construed as limiting the invention. Many variations and modifications may be made by one skilled in the art without departing from the principles of the invention, which is also considered to be within the scope of the invention.

Claims (5)

1. The protection method for the driving motor under the flameout condition of the whole vehicle is characterized by comprising the following steps of:
s1, detecting ignition signals of the whole vehicle in real time;
s2, if a preset excitation signal is detected, intermittently supplying power to a state detection module through a vehicle body controller at a preset frequency and collecting the state of a motor;
s3, motor protection is executed according to the motor state;
the motor state includes: the ignition signal voltage and the motor rotating speed, and the duration of the motor working at the ignition signal voltage and the motor rotating speed;
the motor protection includes:
A. the ignition signal voltage V range is: v1 is more than or equal to V2, and no protection operation is executed;
B. the ignition signal voltage V range is: v is less than V1, the motor rotating speed is 0, and no protection operation is executed;
C. the ignition signal voltage V range is: v < V1, motor speed RP ranges are: RP1 is less than or equal to RP2, and the duration T ranges from: t1 is less than or equal to T2 minutes, and no protection operation is executed;
D. the voltage range of the ignition signal is V < V1, and the rotating speed range of the motor is as follows: RP1 is less than or equal to RP2, and the duration T ranges from: t1 is less than or equal to T, and an alarm is output;
E. the voltage range of the ignition signal is V < V1, and the rotating speed range of the motor is as follows: RP2 is less than or equal to RP, and outputting an alarm;
v1 and V2 are voltage values specified according to motor performance, T1 and T2 are time periods specified according to motor performance, and RP1 and RP2 are rotating speeds specified according to motor performance.
2. The protection method for the driving motor under the flameout condition of the whole vehicle according to claim 1, wherein the protection method comprises the following steps: the preset excitation signal is a negative excitation signal generated by converting a vehicle ignition signal from a high level to a low level.
3. The utility model provides a whole car flameout condition driving motor protection system which characterized in that includes:
the flameout working condition driving state detection module of the whole vehicle comprises:
the output end of the logic unit is connected with the input end of the motor position sensor, and the two input ends of the logic unit are respectively connected with the ignition signal of the whole vehicle and the output end of the controllable switch;
the control unit receives the command of the vehicle body controller from the input end, and the output end of the control unit is connected with the control end of the controllable switch to control the on-off of the controllable switch, and receives the command of the vehicle body controller to enable the controllable switch to intermittently on-off at a preset frequency to supply power for the motor position sensor;
the other input end of the controllable switch is connected with the output voltage of the vehicle body controller;
the motor signal acquisition module is used for acquiring motor rotation speed signals, decoding the motor rotation speed signals and then transmitting the motor rotation speed signals to the vehicle body controller;
the state detection module is used for receiving an instruction of the vehicle body controller by the receiving end to supply power to the motor position sensor;
the vehicle body controller is used for detecting a preset excitation signal, outputting an instruction to supply power for the motor position sensor and collecting a motor state at the same time, and the motor state is used for executing motor protection;
the motor protection includes:
A. the ignition signal voltage V range is: v1 is more than or equal to V2, and no protection operation is executed;
B. the ignition signal voltage V range is: v is less than V1, the motor rotating speed is 0, and no protection operation is executed;
C. the ignition signal voltage V range is: v < V1, motor speed RP ranges are: RP1 is less than or equal to RP2, and the duration T ranges from: t1 is less than or equal to T2 minutes, and no protection operation is executed;
D. the voltage range of the ignition signal is V < V1, and the rotating speed range of the motor is as follows: RP1 is less than or equal to RP2, and the duration T ranges from: t1 is less than or equal to T, and an alarm is output;
E. the voltage range of the ignition signal is V < V1, and the rotating speed range of the motor is as follows: RP2 is less than or equal to RP, and outputting an alarm;
v1 and V2 are voltage values specified according to motor performance, T1 and T2 are time periods specified according to motor performance, and RP1 and RP2 are rotating speeds specified according to motor performance.
4. The vehicle flameout condition drive motor protection system of claim 3, wherein: the preset excitation signal is a negative excitation signal generated by converting a vehicle ignition signal from a high level to a low level.
5. The vehicle flameout condition drive motor protection system of claim 3, wherein: the output instruction is an intermittent on-off instruction with preset frequency of the controllable switch.
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