CN215813223U

CN215813223U - Operation parameter detection device and vehicle

Info

Publication number: CN215813223U
Application number: CN202122070936.XU
Authority: CN
Inventors: 胡忠魁
Original assignee: Guangzhou Xiaopeng Motors Technology Co Ltd
Current assignee: Guangzhou Xiaopeng Motors Technology Co Ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2022-02-11
Anticipated expiration: 2031-08-30

Abstract

The embodiment of the application discloses operating parameter detection device and vehicle, through setting up and becoming sensor, become decoding chip soon, software decoding circuit and treater soon, the treater is used for decoding the chip and providing first excitation signal to becoming decoding chip soon at becoming, and when not receiving and becoming decoding chip soon and decoding the first operating parameter of chip based on first excitation signal feedback, control become decoding chip stop work soon and control software decoding circuit to become the sensor and provide the second excitation signal soon, with the basis become the sensor soon based on the second excitation signal feedback and obtain the second operating parameter of motor. Therefore, the running parameter detection device can accurately acquire the running parameters of the motor, and the running state of the motor can be reliably monitored.

Description

Operation parameter detection device and vehicle

Technical Field

The present application relates to the field of battery technology, and more particularly, to an operating parameter detection apparatus and a vehicle.

Background

At present, the rotary transformer fault is a very high-grade fault in the whole vehicle fault, which is related to life safety, and some problems of rotary transformer are often encountered in the real debugging process, so that the rotary transformer fault judgment is particularly important. The detection of the position and the rotating speed of the motor rotor on the traditional vehicle only adopts one scheme, and most of the schemes adopt the decoding scheme of an integrated chip.

The inventor has found that the conventional decoding chip reads the fault state from the relevant register through the SPI, and once the decoding chip is integrated in the motor controller, it may be difficult to reliably monitor the operating state of the motor.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, embodiments of the present application provide an operating parameter detecting device and a vehicle to improve the above problems.

In a first aspect, an embodiment of the present application provides an operation parameter detection apparatus, including: the device comprises a rotary transformer sensor, a rotary transformer decoding chip, a software decoding circuit and a processor. The rotary transformer sensor is arranged on a motor and used for generating a rotary transformer signal when rotating along with the motor under the action of an excitation signal, and the excitation signal is a first excitation signal or a second excitation signal; the rotary transformer decoding chip is connected with the rotary transformer sensor and used for providing the first excitation signal for the rotary transformer sensor and obtaining the operation parameters of the motor according to the rotary transformer signal; the software decoding circuit is connected with the rotary transformer sensor and used for providing the second excitation signal for the rotary transformer sensor; the processor is connected with the rotary transformer decoding chip and the software decoding circuit respectively, and is used for controlling the rotary transformer decoding chip to stop working and controlling the software decoding circuit to provide a second excitation signal for the rotary transformer sensor when the rotary transformer decoding chip provides a first excitation signal for the rotary transformer decoding chip and does not receive a first operation parameter fed back by the rotary transformer decoding chip based on the first excitation signal, so as to obtain a second operation parameter of the motor according to a rotary transformer signal fed back by the rotary transformer sensor based on the second excitation signal.

In one possible implementation, the rotating signals comprise rotating sine signals and rotating cosine signals, and the software decoding circuit comprises an excitation signal generating circuit, a rotating sine receiving circuit and a rotating cosine receiving circuit; the excitation signal generating circuit is connected with the processor and used for responding to an excitation generation control signal sent by the processor to generate a second excitation signal; the input end of the rotary-variable sine receiving circuit is connected with the first output end of the rotary-variable sensor, and the output end of the rotary-variable sine receiving circuit is connected with the processor, and is used for converting the rotary-variable sine signal into a single sine signal and outputting the single sine signal to the processor; the input end of the rotary-change cosine receiving circuit is connected with the second output end of the rotary-change sensor, the output end of the rotary-change cosine receiving circuit is connected with the processor, and the rotary-change cosine receiving circuit is used for converting the rotary-change cosine signal into a single cosine signal and outputting the single cosine signal to the processor; the processor is further configured to obtain a second operating parameter of the motor according to the single sine signal and the single cosine signal.

In an implementation mode, the device comprises a signal detector, wherein the signal detector is respectively connected with the rotary transformer sensor and the processor and is used for detecting whether the excitation signal received by the rotary transformer sensor is abnormal or not and outputting a detection result; the processor is further used for confirming whether the rotary encoder decoder fails according to the detection result.

In one possible embodiment, the signal detector includes a first overvoltage comparison circuit and a second overvoltage comparison circuit, the first overvoltage comparison circuit includes a first comparator and a first pull-up resistor, a non-inverting input terminal of the first comparator is connected with a first power supply, an inverting input terminal of the first comparator is connected with a first input terminal of the rotary transformer sensor, an output terminal of the first comparator is connected with the processor, a first end of the first pull-up resistor is connected with a second power supply, and a second end of the first pull-up resistor is connected between an output terminal of the first comparator and the processor; the second overvoltage comparison circuit comprises a second comparator and a second pull-up resistor, wherein the non-inverting input end of the second comparator is connected with the first power supply, the inverting input end of the second comparator is connected with the second input end of the rotary transformer sensor, the output end of the second comparator is connected with the processor, the first end of the second pull-up resistor is connected with the second power supply, and the second end of the second pull-up resistor is connected between the output end of the second comparator and the processor; the processor is used for determining whether the excitation signal input to the rotary transformer sensor is abnormal or not according to the signals output by the first comparator and the second comparator.

In an implementation manner, the operation parameter detection device further includes an amplifying circuit, an input end of the amplifying circuit is connected to the resolver decoding chip and the software decoding circuit, and an output end of the amplifying circuit is connected to the resolver sensor, and the amplifying circuit is configured to amplify the excitation signal input to the resolver sensor.

In an implementation manner, the amplifying circuit includes a differential circuit and a push-pull amplifying circuit, an input end of the differential circuit is connected to the rotation decoding chip and the software decoding circuit respectively, an output end of the differential circuit is connected to an input end of the push-pull amplifying circuit, and an output end of the push-pull amplifying circuit is connected to the rotation sensor.

In one embodiment, the operation parameter detection device further comprises an isolation circuit connected between the software decoding circuit and the rotation sensor.

In one embodiment, the isolation circuit includes a voltage follower, and the voltage follower has a non-inverting input connected to the rotation sensor, an output connected to the software decoding circuit, and an inverting input connected to the output.

In one embodiment, the isolation circuit includes a transformer, and an input end of the transformer is connected to the rotation sensor and an output end of the transformer is connected to the software decoding circuit.

In a second aspect, the present application provides a vehicle, where the vehicle includes an electric machine and the above-mentioned operation parameter detection device, and the operation parameter detection device is connected with the electric machine.

According to the operating parameter detection device and the vehicle, the rotary transformer sensor, the rotary transformer decoding chip, the software decoding circuit and the processor are arranged, the processor is used for providing a first excitation signal for the rotary transformer decoding chip when the rotary transformer decoding chip does not receive the first operating parameter fed back by the rotary transformer decoding chip based on the first excitation signal, controlling the rotary transformer decoding chip to stop working and controlling the software decoding circuit to provide a second excitation signal for the rotary transformer sensor, and obtaining the second operating parameter of the motor according to the rotary transformer signal fed back by the rotary transformer sensor based on the second excitation signal. Therefore, under the condition that the decoding chip is in fault, the software decoding circuit works to acquire the operating parameters of the motor, so that the operating parameter detection device can be effectively ensured to accurately acquire the operating parameters of the motor, and the operating state of the motor can be reliably monitored.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a connection block diagram of an operation parameter detection apparatus according to an embodiment of the present application;

FIG. 2 is a connection block diagram of a software decoding circuit provided in an embodiment of the present application;

fig. 3 shows a schematic circuit diagram of a rotary sinusoidal receiving circuit according to an embodiment of the present application;

FIG. 4 is a schematic circuit diagram of a rotary cosine receiving circuit according to an embodiment of the present application;

fig. 5 shows another connection block diagram of an operation parameter detection apparatus provided in the embodiment of the present application;

FIG. 6 is a schematic circuit diagram of a first over-voltage comparison circuit according to an embodiment of the present disclosure;

FIG. 7 is a schematic circuit diagram of a second over-voltage comparison circuit according to an embodiment of the present disclosure;

fig. 8 is a schematic circuit diagram of an amplifying circuit according to an embodiment of the present disclosure;

fig. 9 shows another circuit schematic diagram of an amplifying circuit provided in an embodiment of the present application.

Icon: an operation parameter detection device-100; a rotation variation sensor-110; a rotation change decoding chip-120; software decoding circuitry-130; excitation signal generating circuit-132; a rotary-varying sine receiving circuit-134; a rotary change cosine receiving circuit-136; a processor-140; a signal detector-150; a first over-voltage comparison circuit-152; a second over-voltage comparison circuit-154; -an amplifying circuit-160; -an isolation circuit-170; a voltage follower-172; a transformer-174.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

At present, with the increasing importance of the country on energy conservation and emission reduction, new energy automobiles become the key industry of the country, and have been developed rapidly in recent years, but with the increasing functions of automobiles, the safety problem of the automobiles is concerned more and more, so that the requirements on functional safety of the automobiles are provided. The permanent magnet alternating current motor with remarkable energy saving is more and more widely applied to the electric automobile, and due to the high reliability, high rotating speed and high precision, a position sensor of the permanent magnet alternating current motor is gradually replaced by a rotary transformer sensor from an original photoelectric encoder.

During the running of the vehicle, the detection of the rotating speed and the position of the motor is realized by an analog-digital conversion chip which is specially designed for a rotation change sensor in a motor controller, such as AD2S series of ADI and AU68 series of Domocha. The chip integrates the decoding function and can directly obtain the digital output of the rotation angle and the angular speed. However, the decoding chip is integrated in the motor controller, the rotary position is narrow, the difficulty in measuring the waveform by using the oscilloscope is very high, the debugging is very inconvenient, the problem is not easy to be solved, and the waste of manpower and material resources is caused. In addition, when the chip breaks down, the running state of the motor cannot be continuously monitored, so that when the motor is abnormal, the motor cannot be quickly found, and further accidents can be caused.

Based on this, the embodiment of the application provides an operation parameter detection device and a vehicle, by arranging a rotary transformer sensor, a rotary transformer decoding chip, a software decoding circuit and a processor, the processor is used for controlling the rotary transformer decoding chip to stop working and controlling the software decoding circuit to provide a second excitation signal to the rotary transformer sensor when the rotary transformer decoding chip provides a first excitation signal to the rotary transformer decoding chip and does not receive a first operation parameter fed back by the rotary transformer decoding chip based on the first excitation signal, so as to obtain a second operation parameter of the motor according to a rotary transformer signal fed back by the rotary transformer sensor based on the second excitation signal.

Specifically, the method is used for detecting whether a first operating parameter sent by a rotary transformer decoding chip is received or not when the rotary transformer decoding chip provides the first excitation signal to the rotary transformer decoding chip, confirming that the rotary transformer decoding chip has a fault when the processor does not receive the first operating parameter, controlling the rotary transformer decoding chip to stop working, controlling a software decoding circuit to provide a second excitation signal to a rotary transformer sensor, acquiring a rotary transformer signal generated by the rotary transformer sensor based on the second excitation signal, and obtaining a second operating parameter of the motor according to the rotary transformer signal. Therefore, under the condition that the decoding chip is in fault, the software decoding circuit works to acquire the operating parameters of the motor, so that the operating parameter detection device can be effectively ensured to accurately acquire the operating parameters of the motor, and the operating state of the motor can be reliably monitored.

Referring to fig. 1, the present application provides an operation parameter detecting device 100, where the operation parameter detecting device 100 is used for detecting an operation parameter of a motor, and the operation parameter detecting device 100 includes: a resolver sensor 110, a resolver decoding chip 120, a software decoding circuit 130, and a processor 140.

The rotation sensor 110 is mounted on a motor and is used for generating a rotation signal when the rotation sensor rotates along with the motor under the action of an excitation signal, wherein the excitation signal is a first excitation signal or a second excitation signal; the resolver decoding chip 120 is connected to the resolver sensor 110, and is configured to provide the first excitation signal to the resolver sensor 110, and obtain an operation parameter of the motor according to the resolver signal; the software decoding circuit 130 is connected to the rotation sensor 110, and is configured to provide the second excitation signal to the rotation sensor 110; the processor 140 is connected to the resolver decoding chip 120 and the software decoding circuit 130, respectively, and the processor 140 is configured to detect whether a first operating parameter sent by the resolver decoding chip 120 is received when the resolver decoding chip 120 provides a first excitation signal to the resolver decoding chip 120, confirm that the resolver decoding chip 120 has a fault when the processor 140 does not receive the first operating parameter, control the resolver decoding chip 120 to stop working, control the software decoding circuit 130 to provide a second excitation signal to the resolver sensor 110, acquire a resolver signal generated by the resolver sensor 110 based on the second excitation signal, and acquire a second operating parameter of the motor according to the resolver signal.

The rotation sensor 110 may be an electromagnetic sensor, and structurally, the rotation sensor 110 has a primary winding (excitation winding) and two secondary windings (sine winding and cosine winding) with 90 ° phases. The rotation sensor 110 can be used to measure the angular displacement and angular velocity of the rotating shaft of a rotating object, i.e. the angular displacement and angular velocity of the rotating shaft of the motor, which is known to be the rotation speed and position of the motor. The rotation sensor 110 may be installed on a rotor of the motor, and in a case that a primary winding (excitation winding) of the rotation sensor 110 receives an excitation signal, when the rotor of the motor operates, two secondary windings (sine winding, cosine winding) of the rotation sensor 110 having a phase of 90 ° will generate rotation signals including a rotation sine signal and a rotation cosine signal, respectively, according to the principle of electromagnetic induction. The excitation signal is a differential excitation signal, and correspondingly, the rotation-variation sinusoidal signal and the rotation-variation cosine signal are also differential signals, that is, the rotation-variation signal is a differential rotation-variation signal.

The operating parameters of the motor may include angular displacement of the electrodes, rotational speed, and angular velocity information, among other parameters.

The resolver decoding chip 120 may decode the resolver signal generated by the resolver sensor 110, thereby obtaining angular displacement and angular velocity information of the rotating shaft of the motor. Specifically, the resolver decoding chip 120 inputs an excitation signal to the primary winding of the resolver sensor 110, and receives two feedback signals from two secondary windings of the resolver sensor 110, so as to analyze and determine the angular displacement and the angular velocity information of the rotating shaft of the motor. For example, the resolver decoding chip 120 may have a programmable sine wave oscillator built therein to provide a sine wave excitation signal to the resolver sensor 110. Then, two feedback signals proportional to the sine value and the cosine value of the rotation axis angle output by the rotation sensor 110 are converted into digital signals corresponding to the angular displacement and the angular velocity of the rotation axis, and the digital signals are analyzed according to the algorithm carried by the rotation decoding chip 120, so as to obtain the angular displacement and the angular velocity information of the rotation axis of the motor.

The software decoding circuit 130 may be a circuit capable of providing an excitation signal to the spin sensor 110 under the control of the processor 140 and feeding back the spin signal generated by the spin sensor 110 to the processor 140.

In one possible implementation, the software decoding circuit 130 may include an excitation generation module, a signal feedback circuit. The excitation generating module is configured to output an excitation signal to the rotation sensor 110, and the signal feedback module is configured to feed back a rotation signal generated by the rotation sensor 110 in response to the excitation signal to the processor 140.

Referring to fig. 2, in another possible implementation, the rotation signal includes a rotation sine signal and a rotation cosine signal, and the software decoding circuit 130 includes an excitation signal generating circuit 132, a rotation sine receiving circuit 134, and a rotation cosine receiving circuit 136; the excitation signal generating circuit 132 is connected to the processor 140, and is configured to generate a second excitation signal in response to an excitation generation control signal sent by the processor 140; the input end of the rotational sinusoidal receiving circuit 134 is connected to the first output end of the rotational sensor 110, and the output end of the rotational sinusoidal receiving circuit is connected to the processor 140, so as to convert the rotational sinusoidal signal into a single sinusoidal signal and output the single sinusoidal signal to the processor 140; the input end of the rotational cosine receiving circuit 136 is connected with the second output end of the rotational change sensor 110, and the output end of the rotational cosine receiving circuit is connected with the processor 140, so as to convert the rotational cosine signal into a single cosine signal and output the single cosine signal to the processor 140; the processor 140 is further configured to obtain a second operating parameter of the motor according to the single sine signal and the single cosine signal.

And a rotating sine receiving circuit 134 connected with the sine winding of the rotating sensor 110. The spin-to-sine receiving circuit 134 receives a differential sine signal output from the sine winding of the spin-to-change sensor 110 according to the differential excitation signal and outputs a single-ended sine signal. The resolver sinusoidal receiving circuit 134 is configured to process the differential sinusoidal signals of the sinusoidal windings of the resolver sensor 110 for conversion to single-ended sinusoidal signals.

The rotary change cosine receiving circuit 136 is connected to the cosine winding of the rotary change sensor 110, and the rotary change cosine receiving circuit 136 receives a differential cosine signal output by the cosine winding of the rotary change sensor 110 according to the differential excitation signal and outputs a single-ended cosine signal. The rotary change cosine receiving circuit 136 is used for processing the differential cosine signal of the cosine winding of the rotary change sensor 110 to convert into a single-ended cosine signal.

Specifically, referring to fig. 3, the sinusoidal rotating and transforming receiving circuit 134 includes a sinusoidal signal filtering circuit and a first operational amplifier, wherein the sinusoidal signal filtering circuit is configured to filter the sinusoidal rotating and transforming signals (SIN _ P and SIN _ N) and input the filtered signals to the first operational amplifier to output a single-ended sinusoidal signal (SIN _ ROC). The preset bias voltage V3 is input to the non-inverting input terminal of the first operational amplifier in the rotary-transformer sine receiving circuit 134 to ensure the normal operation of the first operational amplifier, so as to ensure that the waveform of the single-ended sine signal is correct and within a preset proper range, and ensure that the single-ended sine signal can be effectively collected by the processor 140.

The differential sinusoidal signal comprises a forward sinusoidal signal (SIN _ N) and an inverse sinusoidal signal (SIN _ P). The forward sinusoidal signal and the reverse sinusoidal signal are respectively input to the inverting input terminal and the non-inverting input terminal of the operational amplifier in the rotating sinusoidal receiving circuit 134, and the output terminal of the operational amplifier in the rotating sinusoidal receiving circuit 134 outputs a single-ended sinusoidal signal (SIN _ ROC). The preset bias voltage V2 is input to the non-inverting input terminal of the operational amplifier in the rotary-transformer sine receiving circuit 134 to ensure that the waveform of the single-ended sine signal is correct and within a preset proper range, and the single-ended sine signal can be effectively collected by the processor 140.

Since the resolver sensor 110 is installed at the rotor of the motor, a differential sinusoidal signal of the sinusoidal winding of the resolver sensor 110 is liable to introduce an interference signal inside the motor. By utilizing the filtering action of the sinusoidal signal filtering circuit, interference signals are effectively filtered, and the correctness of differential sinusoidal signals is ensured. The sine signal filter circuit may include an RC filter (resistor-capacitor circuit), a common mode capacitor, a differential mode capacitor, and a common mode inductor. And the sinusoidal signal filter circuit respectively inputs the filtered forward sinusoidal signal and the filtered reverse sinusoidal signal into a first amplifier, and the single-ended sinusoidal signal is obtained through the first amplifier. Further, in one embodiment, the sinusoidal receiving circuit 134 further includes a first pull-up resistor and a second pull-down resistor respectively connected to the sinusoidal signal filter circuit, the first pull-up resistor is connected to a circuit portion of the filter circuit through which the forward sinusoidal signal flows, the first pull-down resistor is connected to a circuit portion of the filter circuit through which the reverse sinusoidal signal flows, the first pull-up resistor is connected to a predetermined detection signal voltage (the predetermined detection signal voltage may be 5V), and the first pull-down resistor is grounded. When the differential sinusoidal signals have disconnection, mutual short circuit or power ground disconnection, the current fault state can be determined by performing fault judgment according to the single-ended sinusoidal signals collected by the processor 140.

Similarly, referring to fig. 4, the rotary cosine receiving circuit 136 includes a cosine signal filter circuit for filtering the rotary cosine signals (COS _ N and COS _ P) and inputting the filtered signals to the second operational amplifier to output a single-ended cosine signal (COS _ RDC), and a second operational amplifier. The preset bias voltage V3 is input to the non-inverting input terminal of the operational amplifier in the sinusoidal receiving circuit 134 to ensure the normal operation of the sinusoidal receiving circuit 134, so as to ensure that the waveform of the single-ended cosine signal is correct and within a preset proper range, and ensure that the single-ended cosine signal can be effectively collected by the processor 140.

Since the resolver sensor 110 is installed at the rotor of the motor, the differential cosine signal of the cosine winding of the resolver sensor 110 is easily introduced into an interference signal inside the motor. By utilizing the filtering function of the rotary-variable cosine receiving circuit 136 which also comprises the second pull-up resistors respectively connected with the cosine signal filtering circuit, interference signals are effectively filtered out, and the correctness of differential cosine signals is ensured. The cosine signal filter circuit may include an RC filter (resistor-capacitor circuit), a common mode capacitor, a differential mode capacitor, and a common mode inductor. And the cosine signal filter circuit inputs the filtered sine signal and the filtered inverse cosine signal into the second operational amplifier respectively to obtain a single-ended cosine signal. Furthermore, in one embodiment, the second operational amplifier and the second pull-down circuit, the second pull-up resistor is connected to a circuit portion of the filter circuit through which the forward cosine signal flows, the second pull-down resistor is connected to a circuit portion of the filter circuit through which the reverse cosine signal flows, the second pull-up resistor is connected to a predetermined detection signal voltage (the predetermined detection signal voltage may be 5V), and the second pull-down resistor is grounded. When the differential cosine signals have a broken line, a mutual short circuit or a ground circuit of the power supply, the fault judgment can be carried out according to the single-ended cosine signals collected by the processor 140 to determine the current fault state.

Processor 140 may include one or more cores for processing data. The processor 140 connects various portions throughout the vehicle using various interfaces and lines. Alternatively, the processor 140 may be implemented in hardware using at least one of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), and Programmable Logic Array (PLA). The processor 140 may integrate one or more of a Central Processing Unit (CPU) 140, a Graphics Processing Unit (GPU) 140, a modem, and the like.

In an implementation manner, the processor 140 has an analog-to-digital conversion function, and the processor 140 may be connected to the output end of the rotational sine receiving circuit 134 and the output end of the rotational cosine receiving circuit 136 respectively to receive and analyze the single-ended sine signal and the single-ended cosine signal, so as to obtain the operation information of the motor connected to the rotational sensor 110, i.e., obtain the information of the angular displacement and the angular velocity of the rotating shaft of the motor.

By adopting the operation parameter detection device 100 of the present application, when the resolver decoding chip 120 provides a first excitation signal to the resolver decoding chip 120, the processor 140 detects whether the processor receives the first operation parameter sent by the resolver decoding chip 120, and when the processor 140 does not receive the first operation parameter, the processor 140 confirms that the resolver decoding chip 120 has a fault, controls the resolver decoding chip 120 to stop working and controls the software decoding circuit 130 to provide a second excitation signal to the resolver sensor 110, and obtains the resolver signal generated by the resolver sensor 110 based on the second excitation signal, and obtains the second operation parameter of the motor according to the resolver signal. Therefore, under the condition that the decoding chip is in fault, the software decoding circuit 130 works to acquire the operating parameters of the motor, so that the operating parameter detection device 100 can be effectively ensured to accurately acquire the operating parameters of the motor, and the operating state of the motor can be reliably monitored.

In order to further enable the processor 140 to accurately confirm whether the resolver decoding chip 120 is faulty, in this embodiment, the resolver sensor 110 is further configured to feed back, to the processor 140 through the software decoding circuit 130, a resolver signal generated based on the first excitation signal, and the processor 140 is further configured to generate a third operating parameter according to the resolver signal, and confirm that the resolver decoding chip 120 is faulty when the first operating parameter and the third operating parameter are received and the first operating participation does not match the third operating parameter.

Specifically, the mismatching may be that a difference between the first operating parameter and the third operating parameter is greater than a preset difference threshold, or that a ratio of the first operating parameter to the third operating parameter is not within a preset ratio threshold. The threshold value may be set according to actual requirements, and is not particularly limited herein.

Referring to fig. 5, in order to further enable the processor 140 to accurately confirm whether the resolver decoding chip 120 has a fault, in this embodiment, the operation parameter detecting device 100 includes a signal detector 150, where the signal detector 150 is respectively connected to the resolver sensor 110 and the processor 140, and is configured to detect whether an excitation signal received by the resolver sensor 110 is abnormal, and output a detection result; the processor 140 is further configured to determine whether the convolutional decoder is failed according to the detection result.

It should be understood that the detection of both the first excitation signal and the second excitation signal can be achieved by connecting the signal detector 150 to the rotation sensor 110 to detect whether the excitation signal received by the rotation sensor 110 is correct.

The signal detector 150 may specifically detect whether a voltage of an excitation signal input to the rotation sensor 110 is abnormal, and when the excitation signal is a differential excitation signal, the processor 140 may further detect whether a frequency of the excitation signal is abnormal.

Referring to fig. 6 and 7 in combination, in an implementation, the signal detector 150 includes a first over-voltage comparison circuit 152 and a second over-voltage comparison circuit 154, the first over-voltage comparison circuit 152 includes a first comparator and a first pull-up resistor, a non-inverting input terminal of the first comparator is connected to a first power supply, an inverting input terminal of the first comparator is connected to a first input terminal of the rotation sensor 110, an output terminal of the first comparator is connected to the processor 140, a first terminal of the first pull-up resistor is connected to a second power supply, and a second terminal of the first pull-up resistor is connected between the output terminal of the first comparator and the processor 140; the second overvoltage comparing circuit 154 includes a second comparator and a second pull-up resistor, wherein a non-inverting input terminal of the second comparator is connected to the first power supply, an inverting input terminal of the second comparator is connected to the second input terminal of the rotation sensor 110, an output terminal of the second comparator is connected to the processor 140, a first terminal of the second pull-up resistor is connected to the second power supply, and a second terminal of the second pull-up resistor is connected between the output terminal of the second comparator and the processor 140; the processor 140 is configured to determine whether the excitation signal input to the rotation sensor 110 is abnormal according to the signals output by the first comparator and the second comparator.

Specifically, when the excitation signal is a differential excitation signal, the differential signal includes two signals with the same amplitude and opposite phases, so that when it is determined whether the voltage of the excitation signal is abnormal, the relationship between the amplitudes of the two signals and the preset amplitude may be detected, respectively, to determine whether the voltage of the excitation signal is normal according to the relationship between the detected amplitudes of the two signals and the preset amplitude (for example, when it is detected that the amplitude of the existing signal is greater than the preset amplitude, it is determined that the excitation signal is abnormal).

When confirming whether the frequency of the excitation signal is correct, the processor 140 may collect the amplitude and the phase of the signals output by the first comparator and the second comparator (where the signal output by the first comparator is EXCP _1, and the signal output by the second comparator is EXCN _1), so as to confirm whether the differential excitation signal output to the rotation sensor 110 is abnormal according to the collected amplitude and phase. Specifically, it may be determined whether the frequencies and amplitudes of the two signals included in the differential signal are the same, and when the frequencies and amplitudes are not the same, it may be determined that the differential excitation signal is abnormal.

It should be understood that the processor 140 may confirm that the chip is normal when the first operating parameter sent by the resolver decoding chip 120 is received and the excitation signal generated by the resolver decoding chip 120 is normal. The processor 140 may further confirm that the motor is abnormal when the first operating parameter sent by the resolver decoding chip 120 is received and the first operating parameter is not matched with the second operating parameter, but the excitation signal generated by the resolver decoding chip 120 is normal.

In an implementation manner, the operation parameter detection apparatus 100 further includes an amplifying circuit 160, an input end of the amplifying circuit 160 is connected to the rotation decoding chip 120 and the software decoding circuit 130, and an output end of the amplifying circuit 160 is connected to the rotation sensor 110, and is configured to amplify the excitation signal input to the rotation sensor 110.

In an implementation manner, the amplifying circuit 160 includes a differential circuit and a push-pull amplifying circuit, an input end of the differential circuit is connected to the rotation decoding chip 120 and the software decoding circuit 130, an output end of the differential circuit is connected to an input end of the push-pull amplifying circuit, and an output end of the push-pull amplifying circuit is connected to the rotation sensor 110. The differential circuit comprises an inverter, wherein the inverter is used for ensuring that waveforms before and after the output of the inverter are symmetrical under the action of a preset bias voltage V1, and the precision of an output value of an output end of the inverter is high. The original excitation signal is a sinusoidal signal, the bias voltage V1 is equal to (peak value of sinusoidal signal wave + valley value of sinusoidal signal wave)/2, and the signals before and after the output of the inverter are the differential excitation signal. The push-pull amplifier includes an excitation winding that receives and amplifies the original differential signal into a differential excitation signal and outputs the differential excitation signal to the rotation sensor 110.

The push-pull amplifying circuit is used for enhancing the amplitude of the differential excitation signal, wherein the push-pull amplifying circuit may include one or more of an operational amplifier, a resistor, a capacitor and other electrical components as long as the push-pull amplifying circuit can amplify the amplitude of the differential excitation signal. The detailed circuit structure and functional principle of the push-pull amplifier circuit are not described in detail herein.

Further, in order to improve the buffering and isolating effects of the operating parameter detecting device 100, in this embodiment, the operating parameter detecting device 100 further includes an isolating circuit 170, and the isolating circuit 170 is connected between the software decoding circuit 130 and the rotation sensor 110.

The isolation circuit 170 may be any component or device having an isolation function and including a voltage follower 172, a transformer 174, and an even number of inverters connected in series.

Referring to fig. 8, as an implementation manner, the isolation circuit 170 includes a voltage follower 172, and a non-inverting input terminal of the voltage follower 172 is connected to the rotation sensor 110, an output terminal thereof is connected to the software decoding circuit 130, and an inverting input terminal thereof is connected to the output terminal thereof.

In this way, by arranging the follower, the circuit introduces deep voltage series negative feedback, the input impedance is greatly improved to reach more than 1000M omega, and the output resistance is very low, so the voltage follower 172 can play the roles of impedance conversion and isolation buffering, so that the input and output signals have the same amplitude and are isolated from each other.

Referring to fig. 9, as another possible implementation, the isolation circuit 170 includes a transformer 174, and an input end of the transformer 174 is connected to the rotation sensor 110 and an output end of the transformer is connected to the software decoding circuit 130.

In this manner, the transformer 174 may be a transformer 174 with a primary-secondary turn ratio of 1:1, and the transformer 174 may be used to achieve electrical isolation between differential signal input and output, and at the same time, one component may achieve the isolation function without requiring a complex circuit.

Based on the above-mentioned operating parameter detecting device 100, another vehicle that can execute the above-mentioned operating parameter detecting device 100 is provided in the embodiments of the present application, and the vehicle includes the above-mentioned operating parameter detecting device 100.

The vehicle may be a vehicle or any vehicle having a motor, and is not specifically limited herein, and may be set according to actual requirements.

In one possible embodiment, the vehicle further comprises a memory and a network module.

The Memory may include a Random Access Memory (RAM) or a Read-Only Memory (Read-Only Memory). The memory may be used to store an instruction, a program, code, a set of codes, or a set of instructions. The memory may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing various method embodiments described below, and the like. The storage data area may also store data created by the vehicle in use, and the like.

The network module is used for receiving and sending electromagnetic waves, and realizing the interconversion of the electromagnetic waves and the electric signals, so as to communicate with a communication network or other equipment, for example, audio playing equipment. The network module may include various existing circuit elements for performing these functions, such as an antenna, a radio frequency transceiver, a digital signal processor, an encryption/decryption chip, a Subscriber Identity Module (SIM) card, memory, and so forth. The network module can communicate with various networks such as the internet, a wireless network, or other devices via a wireless network. The wireless network may comprise a cellular telephone network, a wireless local area network, or a metropolitan area network. For example, the network module may exchange information with the base station.

In summary, according to the operation parameter detection apparatus 100 and the vehicle provided by the present application, by providing the resolver sensor 110, the resolver decoding chip 120, the software decoding circuit 130 and the processor 140, the processor 140 is configured to detect whether the resolver decoding chip 120 receives the first operation parameter sent by the resolver decoding chip 120 when providing the first excitation signal to the resolver decoding chip 120, confirm that the resolver decoding chip 120 is faulty when the processor 140 does not receive the first operation parameter, control the resolver decoding chip 120 to stop working, control the software decoding circuit 130 to provide the second excitation signal to the resolver sensor 110, obtain the resolver signal generated by the resolver sensor 110 based on the second excitation signal, and obtain the second operation parameter of the motor according to the resolver signal. Therefore, under the condition that the decoding chip is in fault, the software decoding circuit 130 works to acquire the operating parameters of the motor, so that the operating parameter detection device 100 can be effectively ensured to accurately acquire the operating parameters of the motor, and the operating state of the motor can be reliably monitored.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical feature diagrams may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. An operating parameter detecting device, comprising:

the rotating and changing sensor is arranged on the motor and used for generating a rotating and changing signal when the rotating and changing sensor rotates along with the motor under the action of an excitation signal, and the excitation signal is a first excitation signal or a second excitation signal;

the rotary transformer decoding chip is connected with the rotary transformer sensor and used for providing the first excitation signal for the rotary transformer sensor and obtaining the operation parameters of the motor according to the rotary transformer signal;

the software decoding circuit is connected with the rotary transformer sensor and used for providing the second excitation signal for the rotary transformer sensor;

the processor is connected with the rotary transformer decoding chip and the software decoding circuit respectively, and is used for controlling the rotary transformer decoding chip to stop working and controlling the software decoding circuit to provide a second excitation signal for the rotary transformer sensor when the rotary transformer decoding chip provides a first excitation signal for the rotary transformer decoding chip and does not receive a first operation parameter fed back by the rotary transformer decoding chip based on the first excitation signal, so as to obtain a second operation parameter of the motor according to a rotary transformer signal fed back by the rotary transformer sensor based on the second excitation signal.

2. The apparatus of claim 1, wherein the rotation-varying signal comprises a rotation-varying sine signal and a rotation-varying cosine signal, and the software decoding circuit comprises an excitation signal generating circuit, a rotation-varying sine receiving circuit and a rotation-varying cosine receiving circuit;

the excitation signal generating circuit is connected with the processor and used for responding to an excitation generation control signal sent by the processor to generate a second excitation signal;

the input end of the rotary-variable sine receiving circuit is connected with the first output end of the rotary-variable sensor, and the output end of the rotary-variable sine receiving circuit is connected with the processor, and is used for converting the rotary-variable sine signal into a single sine signal and outputting the single sine signal to the processor;

the input end of the rotary-change cosine receiving circuit is connected with the second output end of the rotary-change sensor, the output end of the rotary-change cosine receiving circuit is connected with the processor, and the rotary-change cosine receiving circuit is used for converting the rotary-change cosine signal into a single cosine signal and outputting the single cosine signal to the processor;

the processor is further configured to obtain a second operating parameter of the motor according to the single sine signal and the single cosine signal.

3. The device according to claim 1, characterized in that the device comprises a signal detector, the signal detector is respectively connected with the rotary transformer sensor and the processor, and is used for detecting whether the excitation signal received by the rotary transformer sensor is abnormal or not and outputting a detection result;

the processor is further used for confirming whether the rotary encoder decoder fails according to the detection result.

4. The apparatus of claim 3, wherein the signal detector comprises a first overvoltage comparison circuit and a second overvoltage comparison circuit, the first overvoltage comparison circuit comprises a first comparator and a first pull-up resistor, a non-inverting input terminal of the first comparator is connected with a first power supply, an inverting input terminal of the first comparator is connected with a first input terminal of the rotation sensor, an output terminal of the first comparator is connected with the processor, a first end of the first pull-up resistor is connected with a second power supply, and a second end of the first pull-up resistor is connected between an output terminal of the first comparator and the processor;

the second overvoltage comparison circuit comprises a second comparator and a second pull-up resistor, wherein the non-inverting input end of the second comparator is connected with the first power supply, the inverting input end of the second comparator is connected with the second input end of the rotary transformer sensor, the output end of the second comparator is connected with the processor, the first end of the second pull-up resistor is connected with the second power supply, and the second end of the second pull-up resistor is connected between the output end of the second comparator and the processor;

the processor is used for determining whether the excitation signal input to the rotary transformer sensor is abnormal or not according to the signals output by the first comparator and the second comparator.

5. The device of claim 1, wherein the operation parameter detection device further comprises an amplifying circuit, an input end of the amplifying circuit is connected to the resolver decoding chip and the software decoding circuit respectively, and an output end of the amplifying circuit is connected to the resolver sensor, and the amplifying circuit is configured to amplify the excitation signal input to the resolver sensor.

6. The device of claim 5, wherein the amplifying circuit comprises a differential circuit and a push-pull amplifying circuit, an input end of the differential circuit is connected with the rotary transformer decoding chip and the software decoding circuit respectively, an output end of the differential circuit is connected with an input end of the push-pull amplifying circuit, and an output end of the push-pull amplifying circuit is connected with the rotary transformer sensor.

7. The apparatus of claim 1, wherein the operating parameter sensing device further comprises an isolation circuit connected between the software decoding circuit and the rotation sensor.

8. The apparatus of claim 7, wherein the isolation circuit comprises a voltage follower having a non-inverting input connected to the rotation sensor, an output connected to the software decoding circuit, and an inverting input connected to the output.

9. The apparatus of claim 7, wherein the isolation circuit comprises a transformer having an input connected to the resolver sensor and an output connected to the software decoding circuit.

10. A vehicle characterized by comprising an electric machine and the operating parameter detecting device of any one of claims 1 to 9, the operating parameter detecting device being connected to the electric machine.