NOx sensor ambient temperature compensation
AssigneeFord Global Technologies, LLC
InventorYi Ding
Life of this patent
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Abstract
Various systems and methods are described for controlling an engine in a vehicle during engine operation, the engine having an exhaust and a NOx sensor coupled in the engine exhaust, in response to an ambient temperature of the NOx sensor. One example method comprises, during warm-up of the NOx sensor and during cold engine starting, adjusting an engine operating condition in response to a NOx-indicative reading of the NOx sensor, the NOx-indicative reading being compensated for ambient temperature effects on the NOx sensor.
Claims20
A method of controlling an engine NOx sensor coupled in an engine exhaust, comprising:
- during warm-up of the NOx sensor and during cold engine starting:
- adjusting an engine operating condition in response to a NOx-indicative reading of the NOx sensor, the NOx-indicative reading being compensated based on an ambient temperature identified by the NOx sensor before exhaust from a first combustion event of the engine from rest reaches the NOx sensor.
A system, comprising:
- an engine exhaust;
- a NOx sensor coupled in the engine exhaust, the NOx sensor having a heater;
- and
- a control system including a computer readable storage medium, the medium including instructions thereon, the control system receiving communication from the NOx sensor, the medium comprising:
- instructions for, during warm-up of the NOx sensor and before exhaust from a first combustion event of the engine from rest reaches the NOx sensor, and before the heater is activated, identifying a first ambient temperature based on the NOx sensor communication;
- instructions for, during engine starting and before the NOx sensor reaches a warmed-up operating temperature and after the first ambient temperature is identified, identifying an exhaust NOx amount based on the NOx sensor;
- instructions for compensating the exhaust NOx amount for the first ambient temperature;
- and
- instructions for adjusting an engine operating condition in response to the compensated exhaust NOx amount.
A method of controlling an engine of a vehicle during engine operation, the engine having an exhaust, and a NOx sensor having a heater coupled in the exhaust, the method comprising:
- during warm-up of the NOx sensor, during cold engine starting, before the heater is activated and before exhaust from a first combustion event of the engine from rest reaches the NOx sensor:
- adjusting an engine operating condition in response to a NOx-indicative reading of the NOx sensor, the NOx-indicative reading being compensated based on an ambient temperature of the NOx sensor, the ambient temperature identified by the NOx sensor;
- and
- after warm-up of the NOx sensor:
- adjusting an engine operating condition in response to a NOx-indicative reading of the NOx sensor, the NOx-indicative reading being compensated based on a deviation of NOx sensor temperature from a set-point temperature.
Dependencies are inferred from the claim text.