Motor vehicle and control method of motor vehicle

Abstract

In a hybrid vehicle of the invention, in the event of specification that an exhaust treatment catalyst is in a preset adequate state at step S112, combustion control of an engine starts after a decrease of an intake pipe pressure P to a preset reference negative pressure Pref and reduction of an intake air flow into a cylinder of the engine by engine motoring. In the event of specification that the exhaust treatment catalyst is not in the preset adequate state but in an inadequate state at step S112, on the other hand, the combustion control of the engine immediately starts, prior to the decrease of the intake pipe pressure P to the preset reference negative pressure Pref. The hybrid vehicle of the invention allows an early start of the combustion control in a lower catalyst temperature condition that lowers the catalytic conversion power of the exhaust treatment catalyst and in a higher catalyst temperature condition that causes accelerated deterioration of the exhaust treatment catalyst in exposure to the air. The early start of the combustion control effectively reduces the potential shocks on a start of the engine, while preventing the potential troubles, for example, the worsened emission and the accelerated deterioration of the exhaust treatment catalyst, arising in the course of engine motoring due to the inadequate state of the exhaust treatment catalyst.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a motor vehicle and a control method of the motor vehicle. [0003] 2. Description of the Prior Art [0004] One proposed technique for a motor vehicle equipped with an internal combustion engine performs combustion control of the internal combustion engine including fuel injection control and ignition control to restart the operation of the internal combustion engine, after an intake pipe pressure in an air intake conduit of the internal combustion engine decreases to a sufficient negative pressure by motoring the internal combustion engine (see, for example, Japanese Patent Laid-Open Gazette No. 2001-304007). This prior art motor vehicle delays the combustion control until a sufficient decrease in amount of the air in the air intake conduit and a cylinder of the internal combustion engine. The delayed combustion control reduces the potential shocks on a start of the internal combustion...

AI Technical Summary

Benefits of technology

[0006] The object of the invention is thus to eliminate the drawbacks of the prior art technique and to provide a motor vehicle that reduces potential shocks on a start of an internal combustion engine and prevents potential troubles arising under some conditions of an exhaust treatment catalyst, as well as to a corresponding control method of such a motor vehicle.

Problems solved by technology

This may not sufficiently reduce the potential shocks on a start of the internal combustion engine but effectively prevents the potential troubles caused by a delayed start timing of the combustion control in the course of engine motoring in the inadequate state of the exhaust treatment catalyst.

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