Device for control of a butterfly valve of an internal combustion engine and internal combustion engine comprising said device

Patent metadata

Field	Value
Publication number	US-11536208-B2
Application number	US-201917283143-A
Country	US
Kind code	B2
Filing date	Oct 17, 2019
Priority date	Oct 17, 2018
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

A control method of a butterfly valve of an internal combustion engine, when said internal combustion engine is running, wherein said butterfly valve is controlled by means of a control signal, indicative of an angular position of said valve, the method comprising a step of applying a first limiting filter of a gradient of said control signal, when a ratio between a target pressure downstream of the butterfly valve and a measured pressure upstream of the butterfly valve is greater than a first predetermined threshold.

First claim

The invention claimed is:

1. An electronic control unit (ECU) for controlling a butterfly valve of an internal combustion engine, wherein the electronic control unit is configured to:
send a control signal to rotate said butterfly valve so as to open and close a suction duct, the control signal being indicative of an angular position of said butterfly valve;
receive a pressure measured upstream of the butterfly valve in said suction duct;
calculate a ratio between a target pressure downstream of the butterfly valve and the measured pressure;
perform a check of whether said calculated ratio is greater than a first predetermined threshold;
limit a gradient for rotating said butterfly valve in said control signal to a first predetermined maximum when said check is positive; and
apply no limitation or a second predetermined maximum to said gradient when said check is negative,
wherein said second predetermined maximum is greater than the first predetermined maximum.

2. The electronic control unit according to claim 1 , wherein the electronic control unit is further configured to:
determine whether said control signal is for an opening movement of said butterfly valve, wherein the limiting of the gradient for the rotating of said butterfly valve in said control signal to the first predetermined maximum is performed only if said determining is positive when said check is positive.

3. The electronic control unit according to claim 2 , wherein the electronic control unit is configured to:
compare said calculated ratio to a second predetermined threshold to determine whether said calculated ratio is less than the second predetermined threshold;
determine an angle of opening for the butterfly valve; and
apply another limiter to the gradient for the rotating of said butterfly valve in said control signal based on one or more of said calculated ratio being determined to be less than the second predetermined threshold and the determined angle of opening for the butterfly valve reaching a predetermined value.

4. The electronic control unit according to claim 3 , comprising a saturator for a derivative of said control signal.

Assignees

• Fpt Ind Spa

Inventors

• Caro Marcello
• Aimar Bruno
• Brucato Aldo

Classifications

• F02D11/105

  characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque · CPC title

• F02D41/022

  in relation with the clutch status · CPC title

• Y02T10/40

  Engine management systems · CPC title

• F02D2200/0414

  Air temperature · CPC title

• F02D9/1005

  Details of the flap · CPC title