Verification method for speed rationality of hybrid electric motor and its function development method
A technology of hybrid power and calibration method, which is applied to devices using electric/magnetic methods, motor generator testing, and measurement of electricity, etc., can solve the problems of endangering personal safety, speed redundancy, and high cost, and achieve good reliability. , the algorithm is simple, the effect of low cost
Active Publication Date: 2020-03-20
HEFEI JUYI POWER SYST CO LTD
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Problems solved by technology
[0003] The existing solution based on resolver to measure speed requires hardware and software support, which is costly and is not suitable for using two sets of resolver on hybrid motors to meet the requirements of functional safety for speed redundancy
Method used
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Embodiment Construction
[0034] The permanent magnet synchronous motor on the hybrid power needs three-phase symmetrical current to drive, and the frequency of the three-phase current determines the speed of the motor. Based on this principle, the invention calculates the rotational speed of the motor by detecting the frequency of the three-phase stator current of the permanent magnet synchronous motor in real time.
[0035] The process of detecting the speed according to the current frequency is as follows: figure 1 shown. The three-phase current of the motor is collected in real time by the current sensor and transmitted to the processor. Since the collected current signal contains noise, which affects the detection accuracy, it is necessary to filter the current signal. The processor judges whether it crosses the zero point by the sign of the current, and when the current crosses the zero point, calculates the time interval between the current zero crossing point and the last zero crossing point, ...
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The invention discloses a verification method of the speed rationality of a hybrid power motor and a function development method thereof. The verification method of the speed rationality of the hybrid power motor includes: during normal operation of the hybrid power motor, the rotating speed of the motor is acquired and calculated through a rotary transformer; the rotating speed of the motor is calculated through a current frequency method; and the obtained two rotating speeds are compared, when the deviation of the two rotating speeds is greater than a set threshold, it is indicated that the motor operates in an abnormal state, the motor or the rotary transformer has a fault, and the fault is reported. According to the method, on one hand, a new algorithm for detecting the speed of the motor is proposed, the speed detected by the algorithm and the speed measured by the rotary transformer are verified, the accuracy of the speed can be guaranteed, and whether hardware has anomaly can be detected; on the other hand, the development and test stages are mainly performed at a HIL stand, the HIL stand can simulate motor control through the algorithm, and the virtual motor control platform can avoid accidents related to personal safety.
Description
technical field [0001] The invention belongs to the technical field of hybrid power, and in particular relates to a checking method for the rationality of the speed of a hybrid power motor and a function development method thereof. Background technique [0002] In order to meet the requirements of functional safety for hybrid electric motors, redundant measurement of the speed of the motor is required to ensure the accuracy and rationality of the detected speed. At the same time, the verification of the motor speed involves safety issues. At present, the speed detection of the motor on the new energy vehicle basically adopts the scheme of the resolver, and generally there is no redundant detection speed scheme. [0003] The existing solution based on resolver to measure speed requires hardware and software support, which is costly and is not suitable for using two sets of resolver on hybrid electric motors to meet the requirement of functional safety for speed redundancy. ...
Claims
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IPC IPC(8): G01P3/44G01P3/48G01R31/34
CPCG01P3/44G01P3/48G01R31/343
Inventor 班建安张茨王强龙姜莹
Owner HEFEI JUYI POWER SYST CO LTD