Method for error diagnosis of an ambient-pressure sensor and an intake-manifold pressure sensor
First Claim
1. A method for error diagnosis of an ambient-pressure sensor and an intake-manifold pressure sensor of an internal combustion engine, comprising:
- measuring a signal of the ambient-pressure sensor and a signal of the intake-manifold pressure sensor while the internal combustion engine is stopped;
comparing an ambient pressure represented by the signal of the ambient-pressure sensor to a first intake-manifold pressure represented by the signal of the intake-manifold pressure sensor to determine a pressure difference; and
if the pressure difference is greater than a predetermined maximum value, measuring at least one additional sensor signal while the internal combustion engine is running, wherein the at least one additional sensor signal is used for identifying a defective sensor.
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Abstract
In a method for error diagnosis of an ambient-pressure sensor and an intake-manifold pressure sensor of an internal combustion engine, a defective intake-manifold pressure sensor or a defective ambient-pressure sensor is unambiguously detected by measuring the signals of the ambient-pressure sensor and the intake-manifold pressure sensor with the internal combustion engine stopped, and comparing the ambient pressure represented by the sensor signal of the ambient-pressure sensor to the intake-manifold pressure represented by the sensor signal of the intake-manifold pressure sensor to determine a pressure difference. If the determined pressure difference is greater than a predetermined maximum value, at least one additional sensor signal is measured with the internal combustion engine running, which additional sensor signal is used for identifying the defective sensor.
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Citations
7 Claims
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1. A method for error diagnosis of an ambient-pressure sensor and an intake-manifold pressure sensor of an internal combustion engine, comprising:
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measuring a signal of the ambient-pressure sensor and a signal of the intake-manifold pressure sensor while the internal combustion engine is stopped;
comparing an ambient pressure represented by the signal of the ambient-pressure sensor to a first intake-manifold pressure represented by the signal of the intake-manifold pressure sensor to determine a pressure difference; and
if the pressure difference is greater than a predetermined maximum value, measuring at least one additional sensor signal while the internal combustion engine is running, wherein the at least one additional sensor signal is used for identifying a defective sensor. - View Dependent Claims (2, 3, 4, 5)
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6. A method for error diagnosis of an ambient-pressure sensor and an intake-manifold pressure sensor of an internal combustion engine, comprising:
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determining an ambient pressure, while the internal combustion engine is stopped, from a signal of the ambient-pressure sensor;
determining a first intake-manifold pressure value, while the internal combustion engine is stopped, from a signal of the intake-manifold pressure sensor;
setting an error entry if a pressure difference between the ambient pressure and the intake-manifold pressure is greater than a first predetermined maximum pressure difference;
determining a second, modeled intake-manifold pressure value from a measured air volume, during operation of the internal combustion engine;
determining a third intake-manifold pressure value, while the internal combustion engine is running, from the signal of the intake-manifold pressure sensor;
setting an error entry for the intake-manifold pressure sensor if a pressure difference between the second, modeled intake-manifold pressure value and the third intake-manifold pressure value is greater than a second predetermined maximum pressure difference; and
setting an error entry for the ambient-pressure sensor if the pressure difference between the second, modeled intake-manifold pressure value and the third intake-manifold pressure value is one of;
a) less than the second predetermined maximum pressure difference; and
b) equal to the second predetermined maximum pressure difference.
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7. A control unit for error diagnosis of an ambient-pressure sensor and an intake-manifold pressure sensor of an internal combustion engine, comprising:
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a means for comparing a signal of the ambient-pressure sensor and a signal of the intake-manifold pressure sensor measured while the internal combustion engine is stopped, to determine a first difference quantity; and
a means for determining a modeled intake-manifold pressure value during operation of the internal combustion engine, if the first difference quantity is greater than a first predetermined maximum value;
a means for determining a second difference quantity between the modeled intake-manifold pressure value and an intake-manifold pressure value measured during operation the internal combustion engine; and
a means for identifying a defective sensor, based on a comparison of the second difference quantity and a second predetermined maximum value.
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Specification