Method and device for operating an internal combustion engine
First Claim
1. A method for operating an internal combustion engine which is operated in at least one operating state with a lean air/fuel mixture, the method comprising the steps of:
- determining the fuel mass as a first quantity, which is to be injected, in dependence upon a desired value;
determining an injection time as a second quantity, which is to be outputted, and outputting the injection time;
determining an actual torque of the engine from at least one of said quantities and comparing to a permissible torque;
initiating a fault reaction when the actual torque is greater than the permissible torque;
making a check as to whether a quantity, which represents the oxygen concentration of the exhaust gas, exceeds a predetermined limit value; and
, initiating a fault reaction when a measured value of said oxygen concentration does not exceed the limit value.
1 Assignment
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Accused Products
Abstract
A method and an arrangement for operating internal combustion engines is suggested which is operated in at least one operating state with a lean air/fuel mixture. The fuel mass, which is to be injected, or the injection time, which is to be outputted, is determined in dependence upon a desired value. For monitoring the operability, the actual torque of the engine is determined on the basis of the fuel mass, which is to be injected, or the injection time, which is to be outputted, or the outputted injection time and compared to a maximum permissible torque and a fault reaction is initiated when the actual torque exceeds the maximum permissible torque. Parallel to the above, a quantity, which represents the oxygen concentration in the exhaust gas, is compared to at least one pregiven limit value and a fault reaction is initiated when this quantity exceeds the limit value.
34 Citations
14 Claims
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1. A method for operating an internal combustion engine which is operated in at least one operating state with a lean air/fuel mixture, the method comprising the steps of:
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determining the fuel mass as a first quantity, which is to be injected, in dependence upon a desired value;
determining an injection time as a second quantity, which is to be outputted, and outputting the injection time;
determining an actual torque of the engine from at least one of said quantities and comparing to a permissible torque;
initiating a fault reaction when the actual torque is greater than the permissible torque;
making a check as to whether a quantity, which represents the oxygen concentration of the exhaust gas, exceeds a predetermined limit value; and
,initiating a fault reaction when a measured value of said oxygen concentration does not exceed the limit value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 14)
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8. A method for operating an internal combustion engine which is operated in at least one operating state with a lean air/fuel mixture, the method comprising the steps of:
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determining the fuel mass as a first quantity, which is to be injected, in dependence upon a desired value;
determining an injection time as a second quantity, which is to be outputted, and outputting the injection time;
determining an actual torque of the engine from at least one of said quantities and comparing to a permissible torque;
initiating a fault reaction when the actual torque is greater than the permissible torque;
comparing a quantity, which represents the oxygen concentration in the exhaust gas, to an operating-point dependent permitted range; and
,initiating a fault reaction when leaving the permitted range. - View Dependent Claims (9, 10, 11)
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12. An arrangement for operating an internal combustion engine which is operated in at least one operating state with a lean air/fuel mixture;
- the arrangement comprising;
a control apparatus which includes at least one microcomputer which functions to determine the fuel quantity, which is to be injected, in dependence upon a desired value and to determine an injection time to be outputted;
means for outputting this injection time;
the microcomputer functioning to determine the actual torque of the engine on the basis of at least one of these values and to compare this torque to a maximum permissible torque and to initiate a fault reaction when the actual torque exceeds the maximum permissible torque; and
,the microcomputer receiving a quantity, which represents the oxygen concentration of the exhaust gas and comparing this quantity to at least one pregiven limit value and initiating a fault reaction when this limit value is exceeded.
- the arrangement comprising;
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13. An arrangement for operating an internal combustion engine which is operated in at least one operating state with a lean air/fuel mixture;
- the arrangement comprising;
a control apparatus which includes at least one microcomputer which functions to determine the fuel quantity, which is to be injected, in dependence upon a desired value and to determine an injection time to be outputted;
means for outputting this injection time;
the microcomputer functioning to determine the actual torque of the engine on the basis of at least one of these values and to compare this torque to a maximum permissible torque and to initiate a fault reaction when the actual torque exceeds the maximum permissible torque; and
,the microcomputer receiving a quantity, which represents the oxygen concentration of the exhaust gas and comparing this quantity to an operating-point dependent permitted range and initiating a fault reaction when leaving the permitted range.
- the arrangement comprising;
Specification