| 摘要 |
A degradation rate decision method of a lambda sensor, may include an injection step injecting a reducing agent so as to regenerate a nitrogen oxide purification catalyst, a lambda value detection step detecting a lambda value of the lambda sensor from a fuel/air ratio of exhaust gas after injecting the reducing agent, a reaching time decision step determining a time period that the lambda value takes to reach a predetermined criterion value after injecting the reducing agent, and a degradation rate decision step determining that the lambda sensor is degraded when the time period is equal to or longer than a predetermined time period.
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