Valve characteristic controller and valve characteristic control system
AssigneeDenso Corporation
InventorsYasuhiro Shikata, Minoru Wada
Life of this patent
Estimating the term…
Abstract
When a valve timing is held, even if a Duty value of an operational signal of a variable valve timing controller is slightly changed, a holding unresponsive range will be arisen. In the unresponsive range, a variation speed of the valve timing is very small. As temperature is decreased, the unresponsive range is extended and an individual difference becomes notable. While the valve timing is held, a computer learns a deviation amount of a response characteristic of the valve timing based on a variation speed of the valve timing when the Duty value is slightly changed from the holding unresponsive range to outside thereof.
Claims25
A valve characteristic controller for an internal combustion engine which is applied to a valve characteristic varying apparatus including a hydraulic valve characteristic varying mechanism and an operation-fluid control means for adjusting a condition of an operation fluid supplied to the hydraulic valve characteristic varying mechanism in order to control a valve characteristic of an engine valve the valve characteristic controller comprising:
- a means for obtaining a detection value detected by a detection means which detects the valve characteristic of the engine valve;
- and
- a learning means for learning a deviation amount of a response characteristic of the valve characteristic varying apparatus based on a temporal variation of the valve characteristic by using of the detection value detected by the detection means as an input, in a situation that a distance between an operational signal of the operation-fluid control means and a holding point where the valve characteristic is held is less than or equal to a specified value.
A valve characteristic controller for an internal combustion engine which is applied to a valve characteristic varying apparatus including a hydraulic valve characteristic varying mechanism and an operation-fluid control means for adjusting a condition of an operation fluid supplied to the hydraulic valve characteristic varying mechanism in order to control a valve characteristic of an engine valve, the valve characteristic controller comprising:
- a means for obtaining a detection value detected by a detection means which detects the valve characteristic of the engine valve;
- and
- a learning means for learning a deviation amount of a response characteristic of the valve characteristic varying apparatus based on a temporal variation of the valve characteristic by using of the detection value detected by the detection means as an input, wherein
- the learning means perform a learning by compulsorily varying an operational signal of the operation-fluid control means without respect to a valve characteristic which is required from a driving condition of the internal combustion engine.
A valve characteristic controller comprising:
- a valve variable mechanism which varies a valve timing of at least one of intake valve and an exhaust valve of an internal combustion engine;
- an operation-fluid control means for controlling an operation fluid supplied to the valve variable mechanism;
- a control means for outputting a control signal for controlling the operation-fluid control means;
- a detection means for detecting a valve timing of the internal combustion engine;
- and
- a learning means for learning the control signal outputted from the control means when the valve timing is rapidly changed from a stable condition based on a temporal variation of the valve timing detected by the detection means.
Dependencies are inferred from the claim text.