Internal combustion engine controlling apparatus

Abstract

In a predetermined low-temperature startup state (in a rich atmosphere), in principle, over-advanced ignition control for advancing ignition timing beyond MBT and intake-synchronized injection controlfor causing the entire amount of to-be-injected fuel to undergo intake-synchronized injection are executed. Thus, the peak of intra-cylinder temperature increases, and the amount of port-adhering fuel decreases, whereby the emission amount of unburnt HC can be reduced. However, when the PM emission amount exceeds a PM permissible amount, instead of the intake-synchronized injection control, thereis performed processing for causing a portion of the to-be-injected fuel to undergo intake-unsynchronized injection and causing the remaining fuel to undergo intake-synchronized injection. Thus, theamount of intra-cylinder-adhering fuel decreases, and the partial oxidation reaction of the intra-cylinder-adhering fuel, which is a cause of generation of PM, is suppressed. As a result, the PM emission amount decreases, whereby the PM emission amount can be suppressed to the PM permissible amount.

Description

technical field [0001] The present invention relates to a control device for a spark ignition type internal combustion engine that performs HC reduction control to reduce the emission of unburned HC in a predetermined low-temperature starting state, and particularly relates to PM (particulate matter, particulate matter) accompanying the execution of HC reduction control Suppression of increased emissions. Background technique [0002] Conventionally, for a spark ignition type internal combustion engine, there has been a control (hereinafter referred to as "MBT") to advance the ignition timing to MBT (Minimum spark advance for Best Torque, ignition timing for obtaining maximum torque) at the time of low-temperature startup (cold engine startup). "over-advance ignition control") technology (for example, refer to Japanese Patent Application Laid-Open No. 2000-240547). Compared with the case where the ignition timing is set to MBT (hereinafter referred to as "MBT control"), the...

AI Technical Summary

Problems solved by technology

[0013] As mentioned above, if the over-timing ignition control (and intake synchronous injection control) (hereinafter also referred to as "HC reduction control") is executed, there will be problems such as an increase in the amount of PM emissions.

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