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CSME 2021/02
Volume 42 No.1
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73-80
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Research on Test for Phase Response Characteristics of VVT
Yin-guo Huanga, Xiao-long Luoa, Mei-rong Zhaoa, Yi-cheng Wanga and Ye-long Zhenga
aState Key Laboratory of Precision Measurement Technology and Instruments, School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Weijin Road 92, Nankai, Tianjin 300072, China.
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Abstract:
Variable Valve Timing (VVT) in automotive engines regulates the phases of engine intake and exhaust at the right time, playing a vital role in improving power, fuel consumption, and emissions reduction. The optimization of the phase response characteristics in the VVT is an efficient way to optimize engine performances. For the purpose of the design and optimization of the VVT, the actual phase response characteristics must be obtained by the test of the VVT phase response characteristics. A VVT test system was designed and presented in this paper. To get the actual VVT phase response characteristics, a three-motor architecture was adopted in this test system, which simulating the actual and real working environment of the engine. In the test system, the driving motor (a three-phase induction motor) simulates the crank shaft of the engine, while the load motor (the permanent magnet synchronous machine, PMSM) is used as the cam shaft of the engine. And the Brushless Direct Current (BLDC) motor drives the VVT. If applying the conventional Proportional-Integral-Differential (PID) controller, the overshooting would be high and the regulating time was too long. With the nonlinear element added to the conventional PID, the defect was broken. It was highly proved through simulations and experiments that the VVT had a faster phase response and small overshooting using the proposed standardized nonlinear PID (SNPID).
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Keywords: VVT, Dynamic Test, Phase Response Characteristics, Engine Environment Simulation
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©
2021
CSME , ISSN 0257-9731
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