Control device and method for air system of diesel engine
AssigneeWeichai Power Co., Ltd.
InventorsGuangdi Hu, Shaojun Sun, Dehui Tong, Shenggang Guo, Yingli Gong
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Abstract
A control device and method for the air system of a diesel engine is disclosed. The feature of the diesel engine is characterized by transfer function. During the control process, a decoupling transfer function is computed according to the transfer function and the steady working parameters of the diesel engine. By the decoupling transfer function acting on the processed state parameters of the air system, driving signals for controlling the exhaust gas recirculation system and the turbocharge system can be individually generated from one another, in order to realize decoupling of them.
Claims20
An apparatus for controlling an air system of a diesel engine in a steady state, wherein the air system comprises an exhaust gas recirculation system and a turbocharge system, the apparatus comprising:
- an operation condition acquiring module configured to acquire actual operation condition parameters indicating an actual operation condition of the diesel engine;
- a decoupling computation module coupled to the operation condition acquiring module, configured to compute a decoupling transfer function based on the parameters from the operation condition acquiring module and on a transfer function characterizing a relation between outputs (i) an opening of an exhaust gas recirculation valve of the exhaust gas recirculation system and (ii) an opening of a supercharge valve of the turbocharge system, and inputs (a) an exhaust gas recirculation flow ratio and (b) an intake air pressure of the diesel engine;
- an air system parameter processing module coupled to the operation condition acquiring module, configured to process parameters indicating a state of the air system, the state of the air system including the exhaust gas recirculation flow ratio and the intake air pressure of the diesel engine;
- and
- a signaling generating module coupled to the decoupling computation module and the air system parameter processing module and to the exhaust gas recirculation system and to the turbocharge system, configured to generate and provide a first driving signal to drive the exhaust gas recirculation system and a second driving signal to drive the turbocharge system based on the decoupling transfer function from the decoupling computation module and on the processing performed by the air system parameter processing module.
A method for controlling an air system of a diesel engine in a steady state, wherein the air system comprises an exhaust gas recirculation system and a turbocharge system, the method comprising:
- acquiring actual operation condition parameters indicating an actual operation condition of the diesel engine;
- computing a decoupling transfer function based on the parameters and on a transfer function characterizing a relation between outputs (i) an opening of an exhaust gas recirculation valve of the exhaust gas recirculation system and (ii) an opening of a supercharge valve of the turbocharge system and inputs (a) an exhaust gas recirculation flow ratio and (b) an intake air pressure of the diesel engine;
- processing parameters indicating a state of the air system, the state of the air system including the exhaust gas recirculation flow ratio and the intake air pressure of the diesel engine;
- and
- generating and providing a first driving signal to drive the exhaust gas recirculation system and a second driving signal to drive the turbocharge system based on the decoupling transfer function and on processing parameters.
A computer program product, comprising at least one computer-readable memory medium having a computer-readable program code portion stored thereon, when executed by a processor, the computer-readable code portion is used to perform steps of a method for controlling an air system of a diesel engine in a steady state, wherein the air system comprises an exhaust gas recirculation system and a turbocharge system, the method comprising:
- acquiring actual operation condition parameters indicating an actual operation condition of the diesel engine;
- computing a decoupling transfer function based on the parameters and on a transfer function characterizing a relation between outputs (i) an opening of an exhaust gas recirculation valve of the exhaust gas recirculation system and (ii) an opening of a supercharge valve of the turbocharge system and inputs (a) an exhaust gas recirculation flow ratio and (b) an intake air pressure of the diesel engine;
- processing parameters indicating a state of the air system, the state of the air system including the exhaust gas recirculation flow ratio and the intake air pressure of the diesel engine;
- and
- generating and providing a first driving signal to drive the exhaust gas recirculation system and a second driving signal to drive the turbocharge system based on the decoupling transfer function and on processing parameters.
Dependencies are inferred from the claim text.