Control system for engine with mechanical supercharger
AssigneeMazda Motor Corporation
InventorsMitsuo Hitomi, Tadyoshi Kaide
Life of this patent
Estimating the term…
Abstract
A control system for an engine with a mechanical supercharger supercharges intake air. The control system has a valve timing variable mechanism for varying an opening and closing timing of an intake valve, a fuel injector delivering fuel in an intake stroke of each of the cylinders of the engine in a high load and low speed region of the engine, and a controller for controlling the valve timing variable mechanism. In a high load region of the engine, an overlapping period of an intake valve and an exhaust valve is longer in a high speed region than in a low speed region. A closing time of the intake valve is earlier than a predetermined optimum closing time and a closing time of the intake valve in a high speed region is later than in the low speed region.
Claims6
A control system for an engine comprising a mechanical supercharger driven by the engine and supercharging intake air:
- valve timing variable means for varying an opening and closing timing of an intake valve;
- a fuel injector delivering fuel during an intake stroke of each of cylinders of the engine in at least a high load and low speed region;
- and
- controlling means for controlling said valve timing variable means so that an overlapping period of the intake valve and an exhaust valve is shorter in a high load and low speed region of the engine than in a high load and high speed region of the engine and a closing time of the intake valve in the high load and low speed region of the engine is earlier than that in the high load and high speed region of the engine.
Dependencies are inferred from the claim text.