Range extender bench test anti-reverse protection and rotating speed measurement device and use method thereof

Abstract

The invention discloses a range extender bench test anti-reverse protection and rotating speed measurement device and a use method thereof, and belongs to the technical field of range extenders. When the range extender operates in the forward direction, a forward rotation speed signal of the range extender is output to a first frequency measurement channel of a test bed from Forword-out of the measurement module through internal logic judgment of a direction judgment integrated block U2 in the measurement module, and the rotation speed measurement and acquisition functions of the range extender are achieved. When the range extender reversely operates, a reverse rotation speed signal of the range extender is output to a frequency measurement channel II of the test bed from Reverse-out of the measurement module through internal logic judgment of a direction judgment integrated block U2 in the measurement module; and when it is detected that the range extender begins to rotate reversely and the rotating speed is still low, sudden stop protection of a test bed is started immediately, ignition power, a control power source of a GCU and fuel supply of an engine are cut off, the range extender is forced to stop running, and the reverse rotation protection function of the range extender is achieved. According to the invention, anti-reverse protection of the bench test of the range extender and rotation speed measurement and acquisition functions of the range extender in the bench test are realized.

Description

technical field [0001] The invention belongs to the technical field of range extenders, in particular to a range extender bench test anti-reverse protection and rotational speed measuring device and a method of use. Background technique [0002] A range extender refers to an electric vehicle component that can provide additional electric energy so that an electric vehicle can increase the mileage. In the traditional sense, a range extender refers to a combination of an engine and a generator. Before leaving the factory, the range extender products generally have to undergo some simulated test runs on the test bench, and can only be put into use after passing. This kind of test is called bench test. [0003] The motor used in the range extender has the ability to work in forward and reverse directions, while the engine generally cannot be reversed. Due to factors such as errors in the calibration parameters of the zero position of the inverter, there is a risk of the motor r...

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Problems solved by technology

[0003] The motor used in the range extender has the ability to work in forward and reverse directions, while the engine generally cannot be reversed. Due to factors such as errors in the calibration parameters of the zero position of the inverter, there is a risk of the motor running out of control and reversing. During the reversing process, the engine oil pump cannot form a normal oil pressure to supply oil to each rotation amplitude, which can easily cause damage to the engine. When the range extender is running on the whole vehicle, the matching and calibration of the motor and the engine have been completed, and the operation process tends to be mature and stable. Besides the start-up process of the range extender, the motor is in constant speed mode under other working conditions, and will not Reversal occurs, so it is more necessary to prevent the accidental reversal of the range extender in the early bench test; in addition, because the engine of the range extender and the motor are coupled through a mechanical connection, only power is output to the outside, and generally there is no mechanical power output interface. The original method of measuring the speed by connecting the dynamometer and the speed sensor on the dynamometer is no longer applicable, but the measurement and collection of the speed signal of the range extender is necessary in the test, so it needs to be realized in other ways Range extender speed measurement

[0004] In the existing speed measurement methods, the method of using a single magnetoelectric or photoelectric non-contact speed sensor has the characteristics of easy installation, but it cannot distinguish the direction of rotation; if a rotary encoder or resolver is used, software cooperation is required, although It has the function of direction discrimination, but it requires high precision of installation and coordination, and has a great influence on the moment of inertia of the wheel train

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