Engine control device and control method
AssigneeNissan Motor Co., Ltd.
InventorsTakeshi Etou, Hatsuo Nagaishi
Life of this patent
Estimating the term…
Abstract
A determination is made as to whether or not knocking is actually occurring inside a combustion chamber (5), and on the basis of the knocking detection result, a knocking-correlated parameter (octane number, alcohol concentration, compression ratio of the engine), which is a parameter having a correlation with knocking, is estimated. A knocking occurrence timing in the combustion chamber (5) is then predicted on the basis of the estimated knocking-correlated parameter. A knocking limit ignition timing, which is the ignition timing furthest toward the advanced side at which knocking does not occur, is calculated on the basis of the predicted knocking occurrence timing, and an ignition device (11) is controlled to perform spark ignition at the knocking limit ignition timing.
Claims15
A control device for an engine having an ignition device, comprising:
- a sensor which detects a knocking in a combustion chamber of the engine;
- and
- a controller which:
- estimates a knocking-correlated parameter, which is a parameter having a correlation with the knocking, on a basis of a knocking detection result;
- predicts a knocking occurrence timing of the combustion chamber on a basis of the estimated knocking-correlated parameter;
- calculates a knocking limit ignition timing, which is an ignition timing furthest toward an advanced side at which the knocking does not occur on a basis of the predicted knocking occurrence timing;
- and
- controls the ignition device to perform a spark ignition at the calculated knocking limit ignition timing;
- estimates a pressure increase amount in the combustion chamber produced by the knocking on the basis of the predicted knocking occurrence timing and an engine operating condition;
- calculates a basic ignition timing corresponding to the engine operating condition;
- and
- sets a value obtained by correcting the basic ignition timing to a retarded side as the knocking limit ignition timing on a basis of the pressure increase amount in the combustion chamber.
A control method for an engine having an ignition device, comprising:
- detecting a knocking in a combustion chamber of the engine;
- estimating a knocking-correlated parameter, which is a parameter having a correlation with the knocking, on a basis of a knocking detection result;
- predicting a knocking occurrence timing of the combustion chamber on a basis of the estimated knocking-correlated parameter;
- calculating a knocking limit ignition timing, which is an ignition timing furthest toward an advanced side at which the knocking does not occur on a basis of the predicted knocking occurrence timing;
- controlling the ignition device to perform a spark ignition at the calculated knocking limit ignition timing;
- estimating a pressure increase amount in the combustion chamber produced by the knocking on the basis of the predicted knocking occurrence timing and an engine operating condition;
- calculating a basic ignition timing corresponding to the engine operating condition;
- and
- setting a value obtained by correcting the basic ignition timing to a retarded side as the knocking limit ignition timing on a basis of the pressure increase amount in the combustion chamber.
A control device for an engine having an ignition device, comprising:
- means for detecting a knocking in a combustion chamber of the engine;
- means for estimating a knocking-correlated parameter, which is a parameter having a correlation with the knocking, on a basis of a knocking detection result;
- means for predicting a knocking occurrence timing of the combustion chamber on a basis of the estimated knocking-correlated parameter;
- means for calculating a knocking limit ignition timing, which is an ignition timing furthest toward an advanced side at which the knocking does not occur on a basis of the predicted knocking occurrence timing;
- means for controlling the ignition device to perform a spark ignition at the calculated knocking limit ignition timing;
- means for estimating a pressure increase amount in the combustion chamber produced by the knocking on the basis of the predicted knocking occurrence timing and an engine operating condition;
- means for calculating a basic ignition timing corresponding to the engine operating condition;
- and
- means for setting a value obtained by correcting the basic ignition timing to a retarded side as the knocking limit ignition timing on a basis of the pressure increase amount in the combustion chamber.
Dependencies are inferred from the claim text.