Throttle controller and throttle controlling method

Patent metadata

Field	Value
Publication number	US-2020132002-A1
Application number	US-201916658284-A
Country	US
Kind code	A1
Filing date	Oct 21, 2019
Priority date	Oct 24, 2018
Publication date	Apr 30, 2020
Grant date	—

Abstract

When a required pressure ratio RP* is less than or equal to a calculation switching pressure ratio RPwot, an engine control unit calculates, as a target opening degree TA*, a throttle opening degree TA at which a throttle upstream-downstream pressure ratio RP is the required pressure ratio RP*. When the required pressure ratio RP* exceeds the calculation switching pressure ratio RPwot, the engine control unit obtains a switching point opening degree TAwot, a switching point load factor KLwot and a maximum load factor KLmax, and calculates the target opening degree TA* as a value that has a linear relationship with the required load factor KL* between the switching point opening degree TAwot and the maximum opening degree TAmax.

First claim

What is claimed is:

1 . A throttle controller that controls an opening degree of a throttle valve installed in an intake passage of an engine, wherein
an opening degree of the throttle valve is defined as a throttle opening TA, a target value of the throttle opening degree TA is defined as a target opening degree TA*, a maximum value in a control range of the throttle opening degree TA is defined as a maximum opening degree TAmax, a required value of a load factor KL of the engine is defined as a required load factor KL*, a maximum value of the load factor KL in a current controlled state of the engine is defined as a maximum load factor KLmax, a ratio of an intake pressure after passing through the throttle valve to an intake pressure before passing through the throttle valve is defined as a throttle upstream-downstream pressure ratio RP, the throttle upstream-downstream pressure ratio RP required to cause the load factor KL to be the required load factor KL* is defined as a required pressure ratio RP*, the throttle opening degree TA when the throttle upstream-downstream pressure ratio RP is a specified value RPwot is defined as a switching point opening degree TAwot, the load factor KL when the throttle upstream-downstream pressure ratio RP is the specified value RPwot is defined as a switching point load factor KLwot, the throttle controller is configured to execute a target opening degree calculation process and a throttle actuation process, in the target opening degree calculation process, the throttle controller
calculates, as the target opening degree TA*, the throttle opening degree TA at which the throttle upstream-downstream pressure ratio RP is the required pressure ratio RP* in a case in which the value of the required pressure ratio RP* is less than or equal to the specified value RPwot, and
calculates, as the target opening degree TA*, a value that satisfies a following expression in a case in which the value of the required pressure ratio RP* exceeds the specified value RPwot, and

TA
*

=

TAwot
+

(

TAmax
-
TAwot

)

×

KL
*

-
KLwot

KLmax
-
KLwot

in the throttle actuation process, the throttle controller actuates throttle valve to cause the throttle opening degree TA to be the target opening degree TA*.

2 . The throttle controller according to claim 1 , wherein the throttle controller uses a smoothed value of the required load factor KL* as a value of the required load factor KL* that is used to calculate the target opening degree TA* in the case in which the value of the required pressure ratio RP* exceeds the specified value RPwot in the target opening degree calculation process.

3 . The throttle controller according to claim 2 , wherein the throttle controller uses a smoothed value of the switching point load factor KLwot as a value of the switching point load factor KLwot that is used to calculate the target opening degree TA* in the case in which the value of the required pressure ratio RP* exceeds the specified value RPwot in the target opening degree calculation process.

4 . The throttle controller according to claim 2 , wherein the throttle controller uses a smoothed value of the maximum load factor KLmax as a value of the maximum load factor KLmax that is used to calculate the target opening degree TA* in the case in which the value of the required pressure ratio RP* exceeds the specified value RPwot in the target opening degree calculation process.

5 . A throttle controller that controls an opening degree of a throttle valve installed in an intake passage of an engine, wherein
an opening degree of the throttle valve is defined as a throttle opening TA, a target value of the throttle opening degree TA is defined as a target opening degree TA*, a maximum value in a control range of the throttle opening degree TA is defined as a maximum opening degree TAmax, a required value of a load factor KL of the engine is defined as a required load factor KL*, a maximum value of the load factor KL in a current controlled state of the engine is defined as a maximum load factor KLmax, a ratio of an intake pressure after passing through the throttle valve to an intake pressure before passing through the throttle valve is defined as a throttle upstream-downstream pressure ratio RP, the throttle upstream-downstream pressure ratio RP required to cause the load factor KL to be the required load factor KL* is defined as a required pressure ratio RP*, the throttle opening degree TA when the throttle upstream-downstream pressure ratio RP is a specified value RPwot is defined as a switching point opening degree TAwot, the load factor KL when the throttle upstream-downstream pressure ratio RP is the specified value RPwot is defined as a switching point load factor KLwot, the throttle controller comprises circuitry that is configured to execute a target opening degree calculation process and a throttle actuation process, in the target opening degree calculation process, the throttle controller
calculates, as the target opening degree TA*, the throttle opening degree TA at which the throttle upstream-downstream pressure ratio RP is the required pressure ratio RP* in a case in which the value of the required pressure ratio RP* is less than or equal to the specified value RPwot, and
calculates, as the target opening degree TA*, a value that satisfies a following expression in a case in which the value of the required pressure ratio RP* exceeds the specified value RPwot, and

TA
*

=

TAwot
+

(

TAmax
-
TAwot

)

×

KL
*

-
KLwot

KLmax
-
KLwot

in the throttle actuation process, the throttle controller actuates throttle valve to cause the throttle opening degree TA to be the target opening degree TA*.

6 . A throttle controlling method for controlling an opening degree of a throttle valve installed in an intake passage of an engine, wherein
an opening degree of the throttle valve is defined as a throttle opening TA, a target value of the throttle opening degree TA is defined as a target opening degree TA*, a maximum value in a control range of the throttle opening degree TA is defined as a maximum opening de

Assignees

• Toyota Motor Co Ltd

Inventors

• Wanibe Masahiro

Classifications

• F02D41/0002 Primary

  Controlling intake air · CPC title

• F02D2200/0406

  Intake manifold pressure · CPC title

• F02D9/02

  concerning induction conduits (throttle valves, or arrangements thereof in conduits F02D9/08) · CPC title

• F02D2200/0404

  Throttle position · CPC title

• F02D2009/022

  Throttle control function parameters · CPC title