Learning control system for controlling an automotive engine
First Claim
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1. A system for updating coefficients of data for controlling an automotive engine by the data, comprising:
- first means for determining that engine operation is in steady state with respect to first and second variables of engine operation and for producing an output signal when the steady state is determined;
second means for producing new coefficients to be used for updating in the steady state of the engine operation;
means comprising a table storing a plurality of said coefficients, the table comprising;
a two-dimensional table storing said coefficients and having addresses dependent on the first variable; and
a three-dimensional table storing said coefficients and having addresses dependent on the first variable and the second variable, the addresses of the three-dimensional table corresponding to a light load operating range of the engine; and
third means responsive to the output signal of the first means for updating the coefficients by changing the coefficients stored in respective of the tables at an address corresponding to that at least one of said first and second variables of the first means prevailing in the steady state.
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Abstract
Steady state of engine operating conditions is determined by two variables of engine operation. A table is provided comprising a two-dimensional table having addresses dependent on one of the two variables and a three-dimensional table having addresses dependent on the two variables is provided. Data stored in the two-dimensional and three-dimensional tables are updated with new data obtained at the determined steady state at a corresponding address.
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Citations
8 Claims
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1. A system for updating coefficients of data for controlling an automotive engine by the data, comprising:
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first means for determining that engine operation is in steady state with respect to first and second variables of engine operation and for producing an output signal when the steady state is determined; second means for producing new coefficients to be used for updating in the steady state of the engine operation; means comprising a table storing a plurality of said coefficients, the table comprising; a two-dimensional table storing said coefficients and having addresses dependent on the first variable; and a three-dimensional table storing said coefficients and having addresses dependent on the first variable and the second variable, the addresses of the three-dimensional table corresponding to a light load operating range of the engine; and third means responsive to the output signal of the first means for updating the coefficients by changing the coefficients stored in respective of the tables at an address corresponding to that at least one of said first and second variables of the first means prevailing in the steady state. - View Dependent Claims (2, 3)
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4. A system for updating coefficients of data in an apparatus for controlling air-fuel ratio in an automotive engine by the data, the system comprising:
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a two-dimensional table storing a plurality of the coefficients and having addresses dependent on a first variable of engine operation; a three-dimensional table storing a plurality of the coefficients and having addresses dependent on the first variable and a second variable of engine opertion, all of the addresses of the three-dimensional table corresponding to a light load operating range of the engine, all of the addresses of the two-dimensional table corresponding to an operating range of the engine which is outside said light load operating range; the apparatus comprising means for detecting an operating condition of the engine and for producing a feedback signal dependent on the latter operating condition; the apparatus comprising means for controlling the air-fuel ratio dependent on said feedback signal and on currently prevailing of the data in the tables; the system further comprising; first means for determining that engine operation is in steady state by determining that said first and second variables of engine operation stay in one of divisions of a matrix for a predetermined period, the matrix being formed by ranges of the first and second variables of engine operation, said second means for producing an output signal when the steady state is so determined; second means for producing new coefficients to be used for updating the coefficients stored in the tables, in the steady state of the engine operation; third means for detecting said output signal of the first means for updating the coefficients stored in either the two-dimensional table and the three-dimensional table by replacing the coefficients with the new coefficients at an address of the respective tables corresponding to that of prevailing of the variables of the first means occurring in the steady state, until the feedback signal reaches a desired value. - View Dependent Claims (5, 6, 7, 8)
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Specification