Process and arrangement for monitoring a belt or chain drive of an internal combustion engine
First Claim
1. A process for monitoring a belt or chain drive of an internal combustion engine that passes over at least two wheels, one of which drives a cam which is associated with a fuel metering device for the engine and another of which is associated with a crankshaft for the engine, comprising:
- providing a sensor for each wheel to produce signals from which a phase relation of the wheels relative to each other can be determined;
generating a signal indicating an elongation of the belt or chain drive if the phase relation of the wheels deviates from a nominal value;
determining in a control computer associated with the internal combustion engine and from an engine performance characteristic diagram, data values for the fuel metering device based on factors including signals from the sensors which have a performance characteristic-dependent nominal relationship to intake and exhaust valves of the internal combustion engine in such a manner that, at a performance characteristic-dependent operating point of the internal combustion engine, the fuel metering device is actuated in accordance with the data values to deliver a nominal fuel quantity;
determining a correction signal for the data values as a function of the sensor signals; and
generating a corrected data value so that a hypothetical fuel quantity which would result from an elongation of the belt or chain drive and which deviates from the nominal fuel quantity is corrected to the value of the nominal fuel quantity.
1 Assignment
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Accused Products
Abstract
In order to monitor and compensate for undesirable elongation of a belt or chain drive of an internal combustion engine, a control computer determines the start and time duration of fuel injection and corrects the time duration as a function of the phase relation between the engine crankshaft and a shaft having a cam for controlling fuel injection so that a desired nominal fuel quantity is injected even if belt or chain elongation causes the phase relation between the shafts to be changed.
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Citations
6 Claims
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1. A process for monitoring a belt or chain drive of an internal combustion engine that passes over at least two wheels, one of which drives a cam which is associated with a fuel metering device for the engine and another of which is associated with a crankshaft for the engine, comprising:
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providing a sensor for each wheel to produce signals from which a phase relation of the wheels relative to each other can be determined; generating a signal indicating an elongation of the belt or chain drive if the phase relation of the wheels deviates from a nominal value; determining in a control computer associated with the internal combustion engine and from an engine performance characteristic diagram, data values for the fuel metering device based on factors including signals from the sensors which have a performance characteristic-dependent nominal relationship to intake and exhaust valves of the internal combustion engine in such a manner that, at a performance characteristic-dependent operating point of the internal combustion engine, the fuel metering device is actuated in accordance with the data values to deliver a nominal fuel quantity; determining a correction signal for the data values as a function of the sensor signals; and generating a corrected data value so that a hypothetical fuel quantity which would result from an elongation of the belt or chain drive and which deviates from the nominal fuel quantity is corrected to the value of the nominal fuel quantity. - View Dependent Claims (2, 3, 4)
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5. An arrangement for monitoring a belt or chain drive of an internal combustion engine comprising a chain or belt drive;
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a fuel metering device for controlling injection of fuel in the engine in accordance with data values; a plurality of wheels engaged by the chain or belt drive, one of which drives a cam associated with the fuel metering device for the engine; a sensor for each wheel arranged to produce signals from which a phase relation of the wheels relative to each other can be determined and from which elongation of the belt or chain drive from a nominal value can be detected; a control computer for the engine containing a performance characteristic diagram for determining data values for the fuel metering device and for determining a corrected data value based on the signals representing the phase relation between the wheels as detected by the sensors so that, at a performance characteristic-dependent operating point of the engine, the fuel metering device is operated in accordance with the data values corrected for any elongation of the belt or chain device; and wherein one wheel is associated with a crankshaft of the internal combustion engine and another wheel is associated with a shaft having cams which periodically actuates intake and exhaust valves and the fuel metering device. - View Dependent Claims (6)
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Specification