Method and Device for the Operation of a Binary Lambda Sensor Arranged in an Exhaust Gas Tract of an Internal Combustion Engine

摘要

A binary lambda sensor has a first electrode arranged on the exhaust gas side, a second electrode arranged contiguous to a reference air volume, and a power source arranged between the first and second electrode. A potential difference between the first and second electrodes forms a measurement signal of the sensor. In a measurement operation of the sensor, the power source is operated in a measurement operating state and provides the measurement signal. To adjust a specified oxygen concentration in the reference air volume, the power source is operated in a regeneration operating state. If a specified condition is fulfilled and the engine is operating in a coasting mode, the power source is operated in the measurement operating state, and a power source adjustment signal is determined for the regeneration operating state based on the measurement signal, for the adjustment of the specified oxygen concentration in the reference air volume.

主权项

1. A method for operating a binary lambda probe arranged in an exhaust gas section of an internal combustion engine and having a first electrode arranged on the exhaust gas side, a second electrode arranged to adjoin a reference air volume, and a current source arranged electrically between the first and the second electrode, wherein a potential difference between the first and the second electrode forms a measurement signal of the binary lambda probe, the method comprising:
operating the current source in a measurement operation state during a measurement operation of the binary lambda probe, and providing the measurement signal, operating the current source in a regeneration operation state to set a prespecified oxygen concentration in the reference air volume, and when a prespecified condition is met and the internal combustion engine is in an overrun operation state in which a supply of fuel is suppressed:
operating the current source in the measurement operation state, anddetermining an actuating signal for the current source for the regeneration operation state of said current source based on the measurement signal of the binary lambda probe in order to set the prespecified oxygen concentration in the reference air volume.