Method and system for filtering a disturbed cylinder pressure signal from a cylinder in an internal combustion engine
First Claim
1. A method for filtering a disturbed cylinder pressure signal from a cylinder in an internal combustion engine, wherein during one operating cycle of the engine, the disturbed cylinder pressure signal is affected by multiple disturbance variables occurring during specific time periods in the operating cycle, the multiple disturbance variables including multiple different types of disturbance variables, the method comprising the steps of:
- maintaining assignments of different filter types to the different types of disturbance variables, each assignment comprising an assignment of one of the different filter types to one of the different types of disturbance variables, such that at least two different filter types are assigned to at least two different types of disturbance variables,for each disturbance variable in the pressure signal occurring during the operating cycle;
determining the type of the disturbance variable and applying the type of filter that is assigned to that type of disturbance variable in order to filter the disturbance variable from the pressure signal, such that different filter types are used to filter different disturbance variables during the operating cycle, andcontrolling the timing of applying the filters to the multiple disturbance variables in the cylinder pressure signal as a function of a crankshaft angle and predetermined time windows corresponding to the disturbance variables.
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Accused Products
Abstract
For at least one disturbance variable of the cylinder pressure signal, which disturbance variable occurs only during specific limited time spans as the pressure profile of an operating cycle, a filter tuned to the type of disturbance variable is fixed and is assigned to the corresponding disturbance variable time window or windows (8, 9, 10) in the operating cycle. The cylinder pressure signal (2) is then filtered as a function of the crankshaft angle, in that, according to the crankshaft position, a time-tuned and type-tuned filter is applied to a current disturbance variable.
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Citations
19 Claims
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1. A method for filtering a disturbed cylinder pressure signal from a cylinder in an internal combustion engine, wherein during one operating cycle of the engine, the disturbed cylinder pressure signal is affected by multiple disturbance variables occurring during specific time periods in the operating cycle, the multiple disturbance variables including multiple different types of disturbance variables, the method comprising the steps of:
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maintaining assignments of different filter types to the different types of disturbance variables, each assignment comprising an assignment of one of the different filter types to one of the different types of disturbance variables, such that at least two different filter types are assigned to at least two different types of disturbance variables, for each disturbance variable in the pressure signal occurring during the operating cycle; determining the type of the disturbance variable and applying the type of filter that is assigned to that type of disturbance variable in order to filter the disturbance variable from the pressure signal, such that different filter types are used to filter different disturbance variables during the operating cycle, and controlling the timing of applying the filters to the multiple disturbance variables in the cylinder pressure signal as a function of a crankshaft angle and predetermined time windows corresponding to the disturbance variables. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for filtering a disturbed cylinder pressure signal from a cylinder in an internal combustion engine, wherein during one operating cycle of the engine, the disturbed cylinder pressure signal is affected by multiple disturbance variables occurring during specific time periods in the operating cycle, the multiple disturbance variables including multiple different types of disturbance variables, the system comprising:
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non-volatile memory storing assignments of different filter types to the different types of disturbance variables, each assignment comprising an assignment of one of the different filter types to one of the different types of disturbance variables, such that at least two different filter types are assigned to at least two different types of disturbance variables, an electronic evaluation unit embodied in non-transitory computer-readable media, which electronic evaluation unit is operable, for each disturbance variable of the cylinder pressure signal, which disturbance variable occurs during specific limited time spans of the pressure profile of an operating cycle, to determine the type of the disturbance variable and applying the type of filter that is assigned to that type of disturbance variable in order to filter the disturbance variable from the pressure signal, such that different filter types are used to filter different disturbance variables during wherein the non-volatile memory further stores disturbance variable time windows associated with the multiple disturbance variables in the operating cycle , and wherein the electronic evaluation unit is further operable to control the timing of applying the filters to the disturbance variables based on a current crankshaft position and the stored disturbance variable windows associated with the multiple disturbance variables. - View Dependent Claims (13, 14, 15)
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16. A system for filtering a disturbed cylinder pressure signal from a cylinder in an internal combustion engine, wherein during one operating cycle of the engine, the disturbed cylinder pressure signal is affected by multiple disturbance variables occurring during specific time periods in the operating cycle, the multiple disturbance variables including multiple different types of disturbance variables, comprising:
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means for storing assignments of different filter types to the different types of disturbance variables, each assignment comprising an assignment of one of the different filter types to one of the different types of disturbance variables, such that at least two different filter types are assigned to at least two different types of disturbance variables, for each disturbance variable in the pressure signal occurring during the operating cycle; means for determining the type of the disturbance variable and applying the type of filter that is assigned to that type of disturbance variable in order to filter the disturbance variable from the pressure signal, such that different filter types are used to filter different disturbance variables during the operating cycle. means for controlling the timing of applying the filters to the multiple disturbance variables in the cylinder pressure signal as a function of a crankshaft angle and predetermined time windows corresponding to the disturbance variables. - View Dependent Claims (17, 18, 19)
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Specification