VCR Actuation System

Hitachi Automotive Systems

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VCR actuator

VCR (​Variable Compression Ratio)
Slim brushless motor
Harmonic Drive reduction gear
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VCR control module

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CAN communication

As use of VCR makes it possible to achieve both the fuel economy of a naturally aspirated engine and the output of a turbocharged engine, the technique is extremely useful when turbocharging is used to downsize engines for higher efficiency.

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