Variable Cam Timing Control System

The variable cam timing (VCT) control system controls the opening/closing timing of the intake valve and exhaust valve in accordance with driving conditions; improving engine output and reducing fuel consumption and emissions. DENSO provides a highly reliable vane VCT control system with a simple structure at low cost.

How the system works:

• The cam position sensor and crank position sensor cooperatively detect the crank shaft rotation during one engine-combustion cycle.
• Based on signals from the cam and crank position sensors, the engine ECU calculates the valve timing.
• The ECU calculates an electrical current amount to manage the oil flow control valve (OCV) to adjust the valve timing.
• In accordance with the electrical current amount, the OCV distributes oil, discharged from the engine oil pump, to two oil chambers of each VCT controller, controlling the oil amounts of the oil chambers.
• Each VCT controller controls the opening/closing timing of the valve in accordance with the oil amounts of the oil chambers.

DENSO has two types of VCT control systems: an intake side VCT controller, and both exhaust side and intake side VCT controllers (as shown in the figure).

Contact Us |  Sitemap |  Privacy Policy |  Terms of Use |  Copyright ® 2005 DENSO CORPORATION. All rights reserved.