Controlling NOx emission control during start of a vehicle
AssigneeVolvo Truck Corporation
InventorsDan Stenqvist, Martin Wilhelmsson
Life of this patent
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Abstract
A method for NOx emission control during start of a vehicle comprising an exhaust aftertreatment system, an engine, and a NOx sensor is provided. The method includes determining a temperature of the NOx sensor; if the determined temperature of the NOx sensor is below a predetermined threshold, initiating heating of the NOx sensor, and performing a preventive action for delaying engine start until a determined temperature of the NOx sensor exceeds or is equal to the predetermined threshold.
Claims12
A method for NOx emission control during start of a vehicle comprising an exhaust aftertreatment system, an engine, and a NOx sensor, the method being characterized by the steps of:
- determining a temperature of the NOx sensor;
- if the determined temperature of the NOx sensor is below a predetermined threshold, initiating heating of the NOx sensor;
- performing a preventive action for preventing engine start until the determined temperature of the NOx sensor exceeds or is equal to the predetermined threshold;
- and
- initiating cold start on board diagnostics and/or on-board monitoring once the engine is started, to monitor cold start NOx emissions over time;
- and
- tracking cold start performances of the vehicle over time.
An exhaust aftertreatment system of a vehicle characterized by:
- an exhaust pipe section for transferring exhaust gas towards an exhaust gas outlet;
- a NOx sensor arranged in the exhaust pipe for measuring a level of nitrogen oxides in the exhaust gas;
- a heater arranged to heat the NOx sensor, and
- a sensor for determining a temperature of the NOx sensor;
- and
- the system further comprising a control unit configured to:
- cause a preventive action for preventing engine start until a determined temperature of the NOx sensor exceeds or is equal to the predetermined threshold;
- initiate cold start on board diagnostics and/or on-board monitoring once the engine is started, to monitor cold start NOx emissions over time, and
- track cold start performances of the vehicle over time.
Dependencies are inferred from the claim text.