Procedure to acquire a sooty particle concentration in the exhaust gas of an internal combustion engine
First Claim
1. A method of ascertaining a sooty particle concentration with a collecting particle sensor in an exhaust gas system of an internal combustion engine and a depletion of an emission purification system of the internal combustion engine due to a loading of sooty particles, the method comprising:
- accepting a sensor signal as an electrical current through the collecting particle sensor and developing a current gradient from the sensor signal by a signal smoothing and a formation of gradients;
determining the sooty particle concentration by a sensor signal emitted by the collecting particle sensor and the current gradient;
determining the depletion of the emission purification system from the sooty particle concentration; and
correcting the sensor signal through predetermined corrections of at least one of;
a sensor temperature, an exhaust gas temperature, a flow velocity of the exhaust gas, and a voltage applied at the collecting particle sensor.
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Abstract
The invention concerns a procedure to ascertain a concentration of sooty particles in an exhaust gas system of an internal combustion engine or a depletion of an emission control system of the internal combustion engine due to the loading of sooty particles, whereby the sooty particle concentration in the exhaust gas system is determined by means of a collecting particle sensor, which emits a sensor signal and whereby the depletion of the emission control system due to the loading of sooty particles is determined from the sooty particle concentration.
The task is thereby solved, in that the sensor signal is corrected by means of predetermined corrections with regard to a sensor temperature and/or an exhaust gas temperature and/or a flow velocity of the exhaust gas and/or a voltage applied at the particle sensor. Transverse sensibilities of the particle sensor can thereby be taken into account during the evaluation; and the determination of the accumulated loading of sooty particles and the determination of the sooty particle concentration in the exhaust gas system are improved. In the process, the sensor temperature enters into the correction to the extent that a temperature dependence of the electrical resistance of the loading of sooty particles is determined in a preparation phase and can be taken into account during the evaluation of the sensor signal.
10 Citations
8 Claims
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1. A method of ascertaining a sooty particle concentration with a collecting particle sensor in an exhaust gas system of an internal combustion engine and a depletion of an emission purification system of the internal combustion engine due to a loading of sooty particles, the method comprising:
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accepting a sensor signal as an electrical current through the collecting particle sensor and developing a current gradient from the sensor signal by a signal smoothing and a formation of gradients; determining the sooty particle concentration by a sensor signal emitted by the collecting particle sensor and the current gradient; determining the depletion of the emission purification system from the sooty particle concentration; and correcting the sensor signal through predetermined corrections of at least one of;
a sensor temperature, an exhaust gas temperature, a flow velocity of the exhaust gas, and a voltage applied at the collecting particle sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification