Plant control system
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorYuji Yasui
Life of this patent
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Abstract
A downstream exhaust system controller generates a target value for the output of an upstream O2 sensor disposed between first and second catalytic converters for converging the output of a downstream O2 sensor disposed downstream of the second catalytic converter to a target value while taking into account the dead time of a downstream exhaust system. An upstream exhaust system controller generates a target air-fuel ratio for an internal combustion engine for converging the output of the upstream O2 sensor to a target value while taking into account the dead time of an upstream exhaust system. A fuel processing controller controls the air-fuel ratio of the internal combustion engine at the target air-fuel ratio according to a feedback control process.
Claims42
A plant control system for controlling a plant for generating an output from an input successively through a first partial plant and a second partial plant, comprising:
- an actuator for generating an input to said plant;
- first detecting means for detecting an output from said plant;
- second detecting means for detecting an output from said first partial plant, which is generated by said first partial plant depending on the input to said plant;
- third detecting means for detecting the input to said plant;
- first control processing means for sequentially generating data representing a target value for an output of said second detecting means which is required to converge an output of said first detecting means to a predetermined target value, according to a feedback control process;
- second control processing means for sequentially generating data representing a target input to said plant which is required to converge the output of said second detecting means to the target value for the output of said second detecting means which is represented by the data generated by said first control processing means, according to a feedback control process;
- actuator control means for manipulating an output of said actuator into the target input to said plant which is represented by the data generated by said second control processing means;
- first estimating means for sequentially generating data representing an estimated value for the output of said first detecting means after a dead time of said second partial plant, using the outputs of said first and second detecting means;
- and
- second estimating means for sequentially generating data representing an estimated value for the output of said second detecting means after a total dead time which is the sum of a dead time of said first partial plant and a dead time of a system which comprises said actuator control means and said actuator, using the outputs of said second and third detecting means;
- said first control processing means comprising means for generating data representing the target value for the output of said second detecting means, using the data generated by said first estimating means, and said second control processing means comprising means for generating data representing the target input to said plant, using the data generated by said second estimating means.
A plant control system for controlling a plant for generating an output from an input successively through a first partial plant and a second partial plant, comprising:
- an actuator for generating an input to said plant;
- first detecting means for detecting an output from said plant;
- second detecting means for detecting an output from said first partial plant, which is generated by said first partial plant depending on the input to said plant;
- third detecting means for detecting the input to said plant;
- first control processing means for sequentially generating data representing a target value for an output of said second detecting means which is required to converge an output of said first detecting means to a predetermined target value, according to a feedback control process;
- second control processing means for sequentially generating data representing a target input to said plant which is required to converge the output of said second detecting means to the target value for the output of said second detecting means which is represented by the data generated by said first control processing means, according to a feedback control process;
- actuator control means for manipulating an output of said actuator into the target input to said plant which is represented by the data generated by said second control processing means;
- first estimating means for sequentially generating data representing an estimated value for the output of said first detecting means after a first total dead time which is the sum of the dead time of said second partial plant and the dead time of a system comprising said second control processing means, said actuator control means, said actuator, and said first partial plant, using the outputs of said first and second detecting means;
- and
- second estimating means for sequentially generating data representing an estimated value for the output of said second detecting means after a second total dead time which is the sum of the dead time of said first partial plant and the dead time of a system comprising said actuator control means and said actuator, using the outputs of said second and third detecting means;
- said first control processing means comprising means for generating data representing the target value for the output of said second detecting means, using the data generated by said first estimating means, and said second control processing means comprising means for generating data representing the target input to said plant, using the data generated by said second estimating means.
Dependencies are inferred from the claim text.