Sensor zero drift diagnosis method and device and vehicle

• Main Authors: MENG QINGLU, ZHANG JIGONG
• Format: Patent
• Language: Chinese; English
• Published: 27.10.2023
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LIGHTING; MEASURING; MECHANICAL ENGINEERING; PHYSICS; TESTING; WEAPONS

The invention provides a sensor zero drift diagnosis method and device and a vehicle, and relates to the technical field of automobiles, and the method comprises the steps: responding to the triggering of a zero drift diagnosis process, and determining the bed temperature of a nitrogen oxide trap connected with a to-be-detected sensor; if the bed temperature of the nitrogen oxide trap is smaller than the preset bed temperature, the difference value between the first nitrogen oxide concentration and the second nitrogen oxide concentration is determined, the first nitrogen oxide concentration is the nitrogen oxide concentration detected by the sensor, and the second nitrogen oxide concentration is the model value of original emission nitrogen oxide of an engine of the vehicle; the preset bed temperature is lower than the critical temperature of thermal decomposition of nitrate; monitoring a timing duration, wherein the timing duration is a duration when the difference value is kept in a first preset range; and