Ignition timing controlling device and method
First Claim
1. An apparatus for controlling an ignition timing of an engine, comprising:
- an ignition timing calculator for adding a fluctuating component to a set ignition timing to calculate a final ignition timing for igniting the engine;
a mean effective pressure calculator for calculating an indicated mean effective pressure for an in-cylinder pressure detected when the engine has been ignited according to the final ignition timing;
an MBT calculator for estimating an ignition timing characteristic curve that represents a correlation between the indicated mean effective pressure and the fluctuating component and for determining an optimum ignition timing from the characteristic curve; and
a controller for controlling the set ignition timing to converge to the optimum ignition timing.
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Accused Products
Abstract
A method of controlling ignition timing of an engine. In the control method, final ignition timing for performing ignition is calculated by adding a variation component to a set ignition timing. According to the final ignition timing, an indicated average effective pressure of an in-cylinder pressure detected when ignition is performed is calculated. An ignition timing characteristic curve indicating the correlation between the indicated average effective pressure and the variation component is estimated and optimal ignition timing is calculated from the characteristic curve. Feedback control for converging the set ignition timing to the optimal ignition timing is then performed. Consequently, the ignition timing is controlled to an optimal ignition timing corresponding to a current operational state of the engine.
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Citations
14 Claims
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1. An apparatus for controlling an ignition timing of an engine, comprising:
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an ignition timing calculator for adding a fluctuating component to a set ignition timing to calculate a final ignition timing for igniting the engine; a mean effective pressure calculator for calculating an indicated mean effective pressure for an in-cylinder pressure detected when the engine has been ignited according to the final ignition timing; an MBT calculator for estimating an ignition timing characteristic curve that represents a correlation between the indicated mean effective pressure and the fluctuating component and for determining an optimum ignition timing from the characteristic curve; and a controller for controlling the set ignition timing to converge to the optimum ignition timing. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for controlling an ignition timing of an engine, comprising the steps of:
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(a) adding a fluctuating component to a set ignition timing to calculate a final ignition timing for igniting the engine; (b) calculating an indicated mean effective pressure for an in-cylinder pressure detected when the engine has been ignited according to the final ignition timing; (c) estimating an ignition timing characteristic curve that represents a correlation between the indicated mean effective pressure and the fluctuating component; (d) determining an optimum ignition timing from the characteristic curve; and (e) controlling the set ignition timing to converge to the optimum ignition timing. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification