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To meet the requirements for lower fuel consumption and emissions as well as higher performances, a “Variable Valve Timing - intelligent by Electric motor (VVT-iE)” system has been newly developed. The system has been firstly adopted to the intake valve train of the Toyota's new 4.6 and 5.0 litter V8 SI engine series. The VVT-iE is composed of a cam phasing mechanism connected to the intake camshaft and brushless motor integrated with its intelligent driver. The motor-actuated system is completely free from operating limitation caused from hydraulic conditions. This enjoys an advantage for reducing cold HC. The system also presents further reduction in fuel consumption.

Active brake controls such as vehicle stability control, VSC, panic brake assist, PBA, etc. have recently been applied to many vehicles. We have developed a new hydraulic brake actuator for active brake control systems. This new hydraulic brake actuator is composed of hydraulic brake booster unit, power supply unit and control valve unit. This paper describes the design of the new hydraulic brake booster unit.