Motor vehicle and control method of motor vehicle

A motor vehicle, comprising:

• a motoring device that is capable of motoring an internal combustion engine;
• an exhaust treatment catalyst that treats exhaust of the internal combustion engine to convert harmful components of the exhaust into harmless components;
• a catalyst state detection unit that detects a state of the exhaust treatment catalyst;
• an intake pipe pressure specification module that specifies whether an intake pipe pressure of the internal combustion engine decreases to a preset reference negative pressure;
• and
• an internal combustion engine start control module that starts combustion control of the internal combustion engine, in response to requirement for a restart of the internal combustion engine,
• when the state of the exhaust treatment catalyst detected by the catalyst state detection unit is a preset adequate state, said internal combustion engine start control module starting the combustion control of the internal combustion engine after specification of a decrease in intake pipe pressure of the internal combustion engine to the preset reference negative pressure by said intake pipe pressure specification module in the course of motoring the internal combustion engine by the motoring device,
• when the state of the exhaust treatment catalyst detected by the catalyst state detection unit is not the preset adequate state but is an inadequate state, said internal combustion engine start control module immediately starting the combustion control of the internal combustion engine, prior to specification of a decrease in intake pipe pressure of the internal combustion engine to the preset reference negative pressure by said intake pipe pressure specification module in the course of motoring the internal combustion engine by the motoring device.

A control method of a motor vehicle, comprising the steps of:

• (a) detecting a state of an exhaust treatment catalyst that treats exhaust of the internal combustion engine to convert harmful components of the exhaust into harmless components;
• and
• (b) when the state of the exhaust treatment catalyst detected by the step (a) is a preset adequate state, starting the combustion control of the internal combustion engine after specification of a decrease in intake air flow into the cylinder of the internal combustion engine to the preset low range, in the course of motoring the internal combustion engine,
• and when the state of the exhaust treatment catalyst detected by the step (a) is not the preset adequate state but is an inadequate state, starting the combustion control of the internal combustion engine, prior to specification of a decrease in intake air flow into the cylinder of the internal combustion engine to the preset low range in the course of motoring the internal combustion engine.

A control method of a motor vehicle, comprising the steps of:

• (a) detecting a state of an exhaust treatment catalyst that treats exhaust of the internal combustion engine to convert harmful components of the exhaust into harmless components;
• and
• (b) when the state of the exhaust treatment catalyst detected by the step (a) is a preset adequate state, starting the combustion control of the internal combustion engine after specification of a decrease in intake pipe pressure of the internal combustion engine to the preset reference negative pressure in the course of motoring the internal combustion engine,
• and when the state of the exhaust treatment catalyst detected by the step (a) is not the preset adequate state but is an inadequate state, starting the combustion control of the internal combustion engine, prior to specification of a decrease in intake pipe pressure of the internal combustion engine to the preset reference negative pressure in the course of motoring the internal combustion engine.