Apparatus for controlling internal combustion engine with supercharging device

An apparatus for controlling an internal combustion engine with a supercharging device operable to produce a desired boost pressure, comprising:

• a throttle control device which controls a throttle valve;
• a pressure sensor located in an induction system to detect an actual boost pressure;
• a control unit being configured to be electronically connected to the throttle control device for arbitrarily controlling a throttle opening of the throttle valve depending on an operated amount of an accelerator;
• said control unit comprising
• (a) an arithmetic-calculation section which calculates a target air quantity based on at least the operated amount of the accelerator,
• (b) an arithmetic-calculation section which calculates the desired boost pressure based on engine speed and engine load,
• (c) an arithmetic-calculation section which calculates a boost-pressure correction factor responsively to a difference between the desired boost pressure and the actual boost pressure, and
• (d) a determination section which determines whether the engine is in an operating region of a lean air/fuel ratio or in an operating region of a stoichiometric air/fuel ratio, and
• (e) an arithmetic-and-logic section which is responsive to a result determined by the determination section, for compensating for the target air quantity by the boost-pressure correction factor to generate a compensated target air quantity and determining the compensated target air quantity as a virtual target air quantity when the engine is in the operating region of the lean air/fuel ratio, and for determining the target air quantity itself as the virtual target air quantity when the engine is in the operating region of the stoichiometric air/fuel ratio;
• and
• a throttle actuator device which drives the throttle valve, so that the virtual target air quantity is drawn into the engine.

In a computed-controlled internal combustion engine with a supercharging device operable to produce a desired boost pressure, an electronic engine control system for compensating for a response delay in boost-pressure change, comprising:

• a throttle control means for controlling a throttle valve;
• a pressure sensing means located in an induction system for detecting an actual boost pressure;
• a control unit being configured to be connected to the throttle control means for arbitrarily controlling a throttle opening of the throttle valve depending on an operated amount of an accelerator;
• said control unit comprising
• (a) an arithmetic-calculation means for calculating a target air quantity used in an engine operating region of a lean air/fuel ratio, based on at least the operated amount of the accelerator,
• (b) an arithmetic-calculation means for calculating the desired boost pressure based on engine speed and engine load,
• (c) an arithmetic-calculation means for calculating a boost-pressure correction factor responsively to a difference between the desired boost pressure and the actual boost pressure, in the engine operating region of the lean air/fuel ratio, and
• (d) an arithmetic-calculation means for compensating for the target air quantity used in the engine operating region of the lean air/fuel ratio by the boost-pressure correction factor to generate a compensated target air quantity, and for determining the compensated target air quantity as a virtual target air quantity;
• and
• a throttle actuating means for driving the throttle valve, so that the virtual target air quantity is drawn into the engine.

In a computed-controlled internal combustion engine with a supercharging device operable to produce a desired boost pressure, an electronic engine control system for compensating for a response delay in boost-pressure change, comprising:

• a throttle control means for controlling a throttle valve;
• a pressure sensing means located in an induction system for detecting an actual boost pressure;
• a control unit being configured to be connected to the throttle controlling means for arbitrarily controlling a throttle opening of the throttle valve depending on an operated amount of an accelerator;
• said control unit comprising
• (a) an arithmetic-calculation means for calculating a target air quantity based on at least the operated amount of the accelerator,
• (b) an arithmetic-calculation means for calculating the desired boost pressure based on engine speed and engine load,
• (c) an arithmetic-calculation means for calculating a boost-pressure correction factor responsively to a difference between the desired boost pressure and the actual boost pressure, and
• (d) a determination means for determining whether the engine is in an operating region of a lean air/fuel ratio or in an operating region of a stoichiometric air/fuel ratio, and
• (e) an arithmetic-and-logic means being responsive to a result determined by the determination section, for compensating for the target air quantity by the boost-pressure correction factor to generate a compensated target air quantity and determining the compensated target air quantity as a virtual target air quantity when the engine is in the operating region of the lean air/fuel ratio, and for determining the target air quantity itself as the virtual target air quantity when the engine is in the operating region of the stoichiometric air/fuel ratio;
• and
• a throttle actuating means for driving the throttle valve, so that the virtual target air quantity is drawn into the engine.

A method for compensating for a response delay in boost-pressure change in a computed-controlled internal combustion engine having a supercharging device operable to produce a desired boost pressure and a throttle valve whose throttle opening is arbitrarily controlled depending on an operated amount of an accelerator, the method comprising:

• detecting an actual boost pressure;
• calculating a target air quantity used in an engine operating region of a lean air/fuel ratio, based on at least the operated amount of the accelerator;
• calculating the desired boost pressure based on engine speed and engine load;
• calculating a boost-pressure correction factor as a ratio of the desired boost pressure to the actual boost pressure, in the engine operating region of the lean air/fuel ratio;
• compensating for the target air quantity used in the engine operating region of the lean air/fuel ratio by the boost-pressure correction factor to generate a compensated target air quantity;
• determining the compensated target air quantity as a virtual target air quantity;
• and
• driving the throttle valve, so that the virtual target air quantity is drawn into the engine.

A method for compensating for a response delay in boost-pressure change in a computed-controlled internal combustion engine having a supercharging device operable to produce a desired boost pressure and a throttle valve whose throttle opening is arbitrarily controlled depending on an operated amount of an accelerator, the method comprising:

• detecting an actual boost pressure;
• calculating a target air quantity based on at least the operated amount of the accelerator;
• calculating the desired boost pressure based on engine speed and engine load;
• calculating a boost-pressure correction factor as a ratio of the desired boost pressure to the actual boost pressure;
• determining whether the engine is in an operating region of a lean air/fuel ratio or in an operating region of a stoichiometric air/fuel ratio;
• compensating for the target air quantity by the boost-pressure correction factor to generate a compensated target air quantity;
• determining the compensated target air quantity as a virtual target air quantity when the engine is in the operating region of the lean air/fuel ratio, and determining the target air quantity itself as the virtual target air quantity when the engine is in the operating region of the stoichiometric air/fuel ratio;
• and
• driving the throttle valve, so that the virtual target air quantity is drawn Into the engine.

An apparatus for controlling an internal combustion engine with a supercharging device operable to produce a desired boost pressure, comprising:

• a throttle control device which controls an electronically-controlled throttle valve;
• a pressure sensor located in an induction system to detect an actual boost pressure;
• a control unit being configured to be electronically connected to the throttle control device for arbitrarily controlling a throttle opening of the electronically-controlled throttle valve depending on an operated amount of an accelerator;
• said control unit comprising
• (a) an arithmetic-calculation section which calculates a target air quantity used in an engine operating region of a lean air/fuel ratio, based on at least the operated amount of the accelerator,
• (b) an arithmetic-calculation section which calculates the desired boost pressure based on engine speed and engine load,
• (c) an arithmetic-calculation section which calculates a boost-pressure correction factor responsively to a difference between the desired boost pressure and the actual boost pressure, in the engine operating region of the lean air/fuel ratio, and
• (d) an arithmetic-calculation section which compensates for the target air quantity used in the engine operating region of the lean air/fuel ratio by the boost-pressure correction factor to generate a compensated target air quantity, and determines the compensated target air quantity as a virtual target air quantity;
• and
• a throttle actuator device which drives the electronically-controlled throttle, so that the virtual target air quantity is drawn into the engine.