Control device for internal combustion engine and internal combustion engine

A control device for an internal combustion engine,

• wherein the internal combustion engine comprises:
• a cylinder,
• an intake passage connected to the cylinder,
• a throttle valve configured to adjust an amount of air flowing into the cylinder through the intake passage,
• an Exhaust Gas Recirculation (EGR) passage configured to cause exhaust gas to recirculate to the intake passage,
• an EGR valve configured to adjust an EGR rate, that is a ratio of the exhaust gas contained in the air flowing into the cylinder, by adjusting an opening degree of the EGR passage,
• a first Positive Crankcase Ventilation (PCV) passage communicating an inside of a crankcase of the internal combustion engine with the intake passage at a downstream side of the throttle valve, and
• a PCV valve configured to adjust an opening degree of the first PCV passage,
• wherein the control device is configured to operate the throttle valve in a closing direction in response to a deceleration request, and
• wherein the control device comprises a processing circuitry including an opening degree restriction control circuitry configured to restrict an opening degree of the PCV valve in a time period from reception of the deceleration request, when
• the PCV valve is closed immediately before the reception of the deceleration request, and
• the throttle valve is operated in the closing direction in response to the deceleration request.

An internal combustion engine, comprising:

• a cylinder,
• an intake passage connected to the cylinder,
• a throttle valve configured to adjust an amount of air flowing into the cylinder through the intake passage,
• an Exhaust Gas Recirculation (EGR) passage configured to cause exhaust gas to recirculate to the intake passage,
• an EGR valve configured to adjust an EGR rate, that is a ratio of the exhaust gas contained in the air flowing into the cylinder, by adjusting an opening degree of the EGR passage,
• a first Positive Crankcase Ventilation (PCV) passage communicating an inside of a crankcase of the internal combustion engine with the intake passage at a downstream side of the throttle valve,
• a PCV valve configured to adjust an opening degree of the first PCV passage, and
• a control device,
• wherein the control device is configured to operate the throttle valve in a closing direction in response to a deceleration request, and
• wherein the control device comprises a processing circuitry including an opening degree control circuitry configured to adjust an opening degree of the PCV valve in a time period from reception of the deceleration request, based on an immediately preceding EGR rate that is an EGR rate immediately before the reception of the deceleration request, when the throttle valve is operated in the closing direction in response to the deceleration request.