Internal combustion engine control apparatus

摘要

An internal combustion engine control apparatus includes a first period in which the target heater applied effective voltage is set to a first target voltage with which the temperature of an exhaust gas sensor becomes a target temperature at a time when the internal combustion engine is being operated; a second control period in which after the automatic stop mode of the engine has started, the target heater applied effective voltage is set to a second target voltage lower than the first target voltage; and a third period in which after the second period, the target heater applied effective voltage is controlled to a third target voltage higher than the second target voltage and with which the temperature of an exhaust gas sensor becomes a target temperature at a time when the engine is in the automatic stop mode.

主权项

1. An internal combustion engine control apparatus of a vehicle, said internal combustion engine control apparatus comprising:
an automatic stop/automatic start device, for an internal combustion engine, that automatically stops the internal combustion engine when a stopping condition for the internal combustion engine is established and automatically starts the internal combustion engine when a starting condition for the internal combustion engine is established; an exhaust gas sensor that is provided in an exhaust path of the internal combustion engine and detects at least one of the air-fuel ratio in an exhaust gas and the rich/lean tendency of the exhaust gas with respect to the theoretical air-fuel ratio; a heater that heats the exhaust gas sensor; and a heater control device that controls an applied effective voltage for the heater in such a way that the applied effective voltage becomes equal to a target heater applied effective voltage, wherein the heater control device includes a first control period in which the target heater applied effective voltage is set to a first target applied effective voltage with which a sensor element temperature of the exhaust gas sensor becomes equal to a sensor element target temperature at a time when the internal combustion engine is being operated; a second control period in which after the automatic stop mode of the internal combustion engine has started, the target heater applied effective voltage is set to a second target applied effective voltage that is lower than the first target applied effective voltage; a second control period end determiner that determines, during the second control period, the end of the second control period; and a third control period in which after determination of the end of the second control period, the target heater applied effective voltage is controlled to be a third target applied effective voltage that is higher than the second target applied effective voltage and with which the sensor element temperature of the exhaust gas sensor becomes equal to a sensor element target temperature at a time when the internal combustion engine is in the automatic stop mode after being operated, and just prior to being restarted, wherein the heater control device includes an automatic stop mode elapsed time measurer that measures an elapsed time from the start of the automatic stop mode of the internal combustion engine; and the second control period end determiner determines that the second control period has ended, when the elapsed time from the start of the automatic stop mode, measured by the automatic stop mode elapsed time measurer, expands as wide as a second control period end duration.