Control apparatus and control method for internal combustion engine

Patent metadata

Field	Value
Publication number	US-2016252020-A1
Application number	US-201615054967-A
Country	US
Kind code	A1
Filing date	Feb 26, 2016
Priority date	Feb 27, 2015
Publication date	Sep 1, 2016
Grant date	—

Abstract

A control apparatus for an engine, the control apparatus includes an ECU. The ECU is configured to: calculate a normalized intake pressure; calculate a pumping loss torque based on the normalized intake pressure; calculate a first value or a value of a linear function as the normalized intake pressure, the first value is obtained by dividing the intake pressure by the atmospheric pressure; calculate the output value based on the normalized intake pressure and a relational data that associate a normalized output value with the normalized intake pressure; the output value is one of a second value obtained by dividing the pumping loss torque by the atmospheric pressure, a normalized pumping loss torque, a third value obtained by dividing an exhaust pressure by the atmospheric pressure, and a normalized exhaust pressure; and calculate one of the pumping loss torque and the exhaust pressure.

First claim

1 . A control apparatus for an internal combustion engine, the internal combustion engine including an intake passage, an exhaust passage and an actuator, the control apparatus comprising
an electronic control unit configured to:
output a command signal to the actuator and control a controlled variable of the internal combustion engine;
acquire an intake pressure in the intake passage;
acquire an atmospheric pressure;
calculate a normalized intake pressure, the normalized intake pressure being a pressure obtained by normalizing the intake pressure by the atmospheric pressure;
calculate a pumping loss torque of the internal combustion engine based on the normalized intake pressure;
calculate a first value or a value of a linear function in which the first value is an independent variable as the normalized intake pressure, the first value being obtained by dividing the intake pressure by the atmospheric pressure;
store relational data, the relational data being data that associate an output value normalized by the atmospheric pressure with the normalized intake pressure;
calculate the output value based on the normalized intake pressure and the relational data,
the output value being one of a second value obtained by dividing the pumping loss torque by the atmospheric pressure, a normalized pumping loss torque as a value of a linear function in which the second value is an independent variable, a third value obtained by dividing an exhaust pressure as a pressure in the exhaust passage by the atmospheric pressure, and a normalized exhaust pressure as a value of a linear function in which the third value is an independent variable; and
calculate one of the pumping loss torque based on the normalized pumping loss torque and the atmospheric pressure, and the exhaust pressure based on the normalized exhaust pressure and the atmospheric pressure, the exhaust pressure being utilized to calculate the pumping loss torque based on a differential pressure from the intake pressure.

2 . The control apparatus according to claim 1 , wherein
the output value normalized by the atmospheric pressure is the normalized pumping loss torque, the electronic control unit is configured to calculate the normalized pumping loss torque based on the normalized intake pressure, and the electronic control unit is configured to calculate the pumping loss torque based on the normalized pumping loss torque and the atmospheric pressure.

3 . The control apparatus according to claim 2 , wherein
the internal combustion engine is further equipped with a variable valve characteristic mechanism, the variable valve characteristic mechanism is configured to change a valve characteristic of an intake valve of the internal combustion engine, the relational data relate a valve-opening timing of the intake valve to the normalized pumping loss torque in addition to the normalized intake pressure, the relational data associate the normalized pumping loss torque such that the normalized pumping loss torque when the valve-opening timing is on a retardation side is larger than the normalized pumping loss torque when the valve-opening timing is on an advancement side, and the electronic control unit is configured to calculate the normalized pumping loss torque based on the valve-opening timing and the relational data in addition to the normalized intake pressure.

4 . The control apparatus according to claim 3 , wherein
the electronic control unit is configured to calculate a same value of the normalized pumping loss torque as in a case where an amount of advancement of the valve-opening timing with respect to a top dead center of a piston is equal to a prescribed value, when the amount of advancement is equal to or larger than the prescribed value, and the prescribed value is a value equal to or larger than zero.

5 . The control apparatus according to claim 4 , wherein
the relational data include first data and second data, the first data is a data when the amount of advancement of the valve-opening timing with respect to the top dead center of the piston is equal to the prescribed value, and the second data is a data when the valve-opening timing is most retarded, and the electronic control unit is configured to calculate the output value normalized by the atmospheric pressure through an interpolating arithmetic operation of the output value normalized by the atmospheric pressure in each of the first data and the second data, when the amount of advancement of the valve-opening timing with respect to the top dead center of the piston is smaller than the prescribed value.

6 . The control apparatus according to claim 1 , wherein
the output value normalized by the atmospheric pressure is the normalized exhaust pressure, the electronic control unit is configured to calculate the normalized exhaust pressure based on the normalized intake pressure, the electronic control unit is configured to calculate the exhaust pressure based on the normalized exhaust pressure and the atmospheric pressure, and the electronic control unit is configured to calculate the pumping loss torque based on the differential pressure between the exhaust pressure and the intake pressure.

7 . The control apparatus according to claim 1 , wherein
the relational data relate a rotational speed of the internal combustion engine to the output value in addition to the normalized intake pressure, and the electronic control unit is configured to calculate the output value based on the rotational speed and the relational data in addition to the normalized intake pressure.

8 . The control apparatus according to claim 3 , wherein
the relational data relate a rotational speed of the internal combustion engine to the output value in addition to the normalized intake pressure and the valve-opening timing, and the electronic control unit is configured to calculate the output value based on the normalized intake pressure, the valve-opening timing, the rotational speed and the relational data.

9 . The control apparatus according to claim 1 , wherein
the electronic control unit is configured to calculate a required axial torque of the internal combustion engine, the electronic control unit is configured to calculate a required indicated torque of the internal combustion engine based on a process of adding a friction torque of the internal combustion engine to the required axial torque, and the electronic control unit is configured to set an operation amount of the actuator of the internal combustion engine based on a value obtained by adding the pumping loss torque to the required indicated torque.

10 . The control apparatus according to claim 9 , wherein
the internal combustion engine includes a throttle valve, the electronic control unit is configured to store air amount conversion data and intake pressure conversion data, the air amount conversion data associate the value obtained by adding the pumping loss torque to the required indicated torque with a target air amount, and the intake pressure conversion data associate the target air amount with the intake pressure, and the electronic control unit is configured to calculate the target air amount using the air amount conversion data and then execute a process of calculating a target intake pressure using the calculated target air amount and the intake pressure conversion data, the target air amount being an arithmetic parameter to set an opening degree of the throttle valve, and a process of acquiring the intake pressure being a process of acquiring the target intake pressure.

11 . A control method for an internal combustion engine, the internal combustion engine including an intake passage, an ex

Assignees

• Toyota Motor Co Ltd

Inventors

• Takahashi Machiko

Classifications

• G01M15/05

  by combined monitoring of two or more different engine parameters · CPC title

• F02D2700/035

  without modifying the volume of the compression space, e.g. by changing the valve timing · CPC title

• F02D41/26

  using computer, e.g. microprocessor · CPC title

• G01M15/08 Primary

  by monitoring pressure in cylinders · CPC title

• F02D23/02 Primary

  the engines being of fuel-injection type · CPC title