Engine management
First Claim
1. An engine management system for an internal combustion engine having at least one cylinder pressure sensor and at least one engine actuator, the system comprising a data processor arranged to receive and process cylinder pressure data from the cylinder pressure sensor and an actuator controller arranged to control the actuator to optimize engine performance based on the processed data, in which the cylinder pressure data is obtained during a performance optimized engine cycle or cycles and the processor processes the data to construct a cylinder pressure variation function for the engine cycle or cycles and derive control data therefrom for the actuator controller, in which the processor derives an offset pressure value from the cylinder pressure data.
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Accused Products
Abstract
An engine management system for an internal combustion engine, which has at least one cylinder pressure sensor and at least one engine actuator, includes a data processor arranged to receive and process cylinder pressure data from the cylinder pressure sensor and the actuator controller arranged to control the actuator to optimize engine performance based on the processed data, in which the cylinder pressure data is obtained during a performance optimized engine cycle or cycles. The processor processes the data to construct a cylinder pressure variation function for the engine cycle or cycles and derive control data therefrom for the actuator controller.
96 Citations
53 Claims
- 1. An engine management system for an internal combustion engine having at least one cylinder pressure sensor and at least one engine actuator, the system comprising a data processor arranged to receive and process cylinder pressure data from the cylinder pressure sensor and an actuator controller arranged to control the actuator to optimize engine performance based on the processed data, in which the cylinder pressure data is obtained during a performance optimized engine cycle or cycles and the processor processes the data to construct a cylinder pressure variation function for the engine cycle or cycles and derive control data therefrom for the actuator controller, in which the processor derives an offset pressure value from the cylinder pressure data.
- 43. An engine management system for an internal combustion engine having a plurality of cylinders each having at least one cylinder pressure sensor and at least one engine actuator, the system comprising a data processor arranged to process cylinder pressure data from each pressure sensor in which the processor constructs a cylinder pressure variation function for each cylinder from the cylinder pressure data, derives a measure of the performance of each cylinder from the respected pressure variation function and balances the cylinder performances, by means of identifying the weakest cylinder and retarding the timing on the other cylinders to match the work done by the weakest cylinder.
- 46. A method of managing an internal combustion engine based on cylinder pressure data from a cylinder pressure sensor comprising the steps of obtaining the cylinder pressure data across one or more performance optimized engine cycles, processing the cylinder pressure data to construct a pressure variation function for the engine cycle or cycles and controlling an engine actuator to optimize engine performance based on the constructed pressure variation function, and further comprising deriving an offset pressure value from cylinder pressure data.
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48. An engine management system for an internal combustion engine having at least one cylinder pressure sensor, the system comprising a sensor controller arranged to retrieve a plurality of cylinder pressure readings per cylinder cycle and a processor arranged to process the readings to construct a cylinder pressure variation function in which sufficient readings are retrieved per cycle to allow noise filtering in the pressure variation function and further comprising a processor for processing the constructed cylinder pressure variation function to identify at least one of engine faults, inlet manifold leaks, inlet or exhaust valve leaks, piston ring failure or leakage, and head gasket leakage.
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49. An engine management system for an internal combustion engine having at least one cylinder pressure sensor and at least one engine actuator, the system comprising a data processor arranged to receive and process cylinder pressure data from the cylinder pressure sensor and an actuator controller arranged to control the actuator to optimize engine performance based on the processed data, in which the cylinder pressure data is obtained during a performance optimized engine cycle or cycles and the processor processes the data to construct a cylinder pressure variation function for the engine cycle or cycles and derive control data therefrom for the actuator controller, in which the processor processes the pressure sensor data to obtain an indicated mean effective pressure (IMEP).
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50. An engine management system for an internal combustion engine having at least one cylinder pressure sensor and at least one engine actuator, the system comprising a data processor arranged to receive and process cylinder pressure data from the cylinder pressure sensor and an actuator controller arranged to control the actuator to optimize engine performance based on the processed data, in which the cylinder pressure data is obtained during a performance optimized engine cycle or cycles and the processor processes the data to construct a cylinder pressure variation function for the engine cycle or cycles and derive control data therefrom for the actuator controller, in which the processor obtains a gross indicated mean effective pressure (IMEP) and detects misfire if the gross IMEP falls below a threshold value.
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51. An engine management system for an internal combustion engine having at least one cylinder pressure sensor and at least one engine actuator, the system comprising a data processor arranged to receive and process cylinder pressure data from the cylinder pressure sensor and an actuator controller arranged to control the actuator to optimize engine performance based on the processed data, in which the cylinder pressure data is obtained during a performance optimized engine cycle or cycles and the processor processes the data to construct a cylinder pressure variation function for the engine cycle of cycles and derive control data therefrom for the actuator controller, in which the processor further derives a function of the variance of an indicated mean effective pressure (IMEP) between engine cycles and compares the function against a threshold value to determine whether a steady state condition exists.
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52. An engine management system for an internal combustion engine having at least one cylinder pressure sensor and at least one engine actuator, the system comprising a data processor arranged to receive and process cylinder pressure data from the cylinder pressure sensor and an actuator controller arranged to control the actuator to optimize engine performance based on the processed data, in which the cylinder pressure data is obtained during a performance optimized engine cycle or cycles and the processor processes the data to construct a cylinder pressure variation function for the engine cycle of cycles and derive control data therefrom for the actuator controller, in which in a start-up mode, the processor derives a function of the variability of an indicated mean effective pressure (IMEP) between engine cycles and compares the function against a threshold value, and the actuator controller controls the actuator based on the comparison.
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53. An engine management system for an internal combustion engine having at least one cylinder pressure sensor and at least one engine actuator, the system comprising a data processor arranged to receive and process cylinder pressure data from the cylinder pressure sensor and an actuator controller arranged to control the actuator to optimize engine performance based on the processed data, in which the cylinder pressure data is obtained during a performance optimized engine cycle or cycles and the processor processes the data to construct a cylinder pressure variation function for the engine cycle of cycles and derive control data therefrom for the actuator controller, in which the processor further processes pressure sensor data to detect cylinder knock.
Specification