Variable valve actuating apparatus and process for internal combustion engine
AssigneeHitachi, Ltd.
InventorsMakoto Nakamura, Seinosuke Hara
Life of this patent
Estimating the term…
Abstract
A variable valve actuating apparatus for an internal combustion engine includes a first valve actuating mechanism to vary a first valve operating condition, and a second valve actuating mechanism to vary a second valve operating condition. A controller controls the first valve actuating mechanism to satisfy a predetermined engine starting condition before a start of a cranking operation or during the cranking operation, with respect to an engine operating condition including the second valve operating condition controlled by the second valve actuating mechanism.
Claims21
A variable valve actuating apparatus for an internal combustion engine, comprising:
- a first valve actuating mechanism configured to vary a first valve operating condition of the engine;
- a second valve actuating mechanism configured to vary a second valve operating condition of the engine;
- and
- a controller configured to control the first valve actuating mechanism to satisfy a predetermined engine starting condition of the engine before an end of a cranking operation of the engine, with respect to an engine operating condition of the engine including the second valve operating condition controlled by the second valve actuating mechanism;
- wherein the first valve actuating mechanism includes an actuating device to control the first valve operating condition of an engine valve of the engine during a stop of the engine or during a cranking operation;
- the second valve actuating mechanism is arranged to vary the second valve operating condition of the engine valve separately from the first valve actuating mechanism;
- and the controller is configured to control an actuating condition of the first valve actuating mechanism to a desired target condition to satisfy the predetermined engine starting condition of the engine before a start of the cranking operation or during the cranking operation of the engine, with respect to the engine operating condition including the second valve operating condition controlled by the second valve actuating mechanism before the start of the cranking operation.
A variable valve actuating apparatus for an internal combustion engine, comprising:
- a first valve actuating mechanism to vary a first valve operating condition of the engine;
- a second valve actuating mechanism to vary a second valve operating condition of the engine;
- and
- a controller configured:
- to detect an actuating position of the second valve actuating mechanism before a start of a cranking operation of the engine,
- to determine a desired target position of the first valve actuating mechanism to achieve a desirable startability in accordance with the actuating position of the second valve actuating mechanism so as to improve the startability of the engine,
- to control the first valve actuating mechanism to the desired target position determined in accordance with the actuating position of the second valve actuating mechanism, and
- to crank the engine after an operation to control the first valve actuating mechanism to the desired target position.
A control process of controlling a variable valve actuating apparatus including a first valve actuating mechanism to vary a first valve operating condition of an internal combustion engine, and a second valve actuating mechanism to vary a second valve operating condition of the engine, the control process comprising:
- detecting an actuating position of the second valve actuating mechanism before a start of a cranking operation of the engine;
- determining a desired target position of the first valve actuating mechanism to achieve a desirable startability in accordance with the actuating position of the second valve actuating mechanism so as to improve the startability of the engine;
- controlling the first valve actuating mechanism to the desired target position determined in accordance with the actuating position of the second valve actuating mechanism;
- and
- allowing a cranking operation of the engine after an operation to control the first valve actuating mechanism to the desired target position.
Dependencies are inferred from the claim text.