# US 2021/0340923 A1 · Device for control of a butterfly valve of an internal combustion engine and internal combustion engine comprising said device

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- Number: US 2021/0340923 A1
- Document ID: US20210340923A1
- Status: Published application
- Kind: A1
- Application number: 17/283,143
- Filed: 2019-10-17
- Published: 2021-11-04
- Earliest claimed: 2018-10-17
- Assignees: Fpt Industrial S.P.A.
- Applicants: Fpt Industrial S.P.A.
- Inventors: Marcello Caro; Bruno Aimar; Aldo Brucato
- Web page: https://patentgrep.com/patent/US20210340923A1

## CPC

- F02D 41/0002: {Controlling intake air}
- F02D 9/1005: {Details of the flap}
- F02D 11/105: {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}
- F02D 41/022: {in relation with the clutch status}
- F02D 2041/1422: {Variable gain or coefficients}
- F02D 2041/1432: {the system including a filter, e.g. a low pass or high pass filter}
- F02D 2200/0404: Throttle position
- F02D 2200/0406: Intake manifold pressure
- F02D 2200/0414: Air temperature
- Y02T 10/40: Engine management systems
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## 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.

## Claims

### Claim 1

A control method of a butterfly valve (F) 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 (alfa) position of said valve, the method comprising a step of applying a first limiting filter (Step 4) of a gradient of said control signal, when a ratio between a target pressure (Pressure_air_Target) downstream of the butterfly valve and a measured pressure (P1) upstream of the butterfly valve is greater (Step 3: YES) than a first predetermined threshold (S1).

### Claim 2 (depends on 1)

The method according to claim 1, further comprising a preliminary step of checking whether said control signal is such to determine an opening of said butterfly valve (Step 2: YES) and, wherein, only when said check is positive and, said ratio is greater than said first predetermined threshold, said step of applying said first limiting filter is performed.

### Claim 3 (depends on 2)

The method according to claim 2, wherein when said preliminary step of checking, whether said control signal is such to determine an opening of said butterfly valve, is negative (Step 2: NO), then the method comprises a step of activating a second limiting filter of the gradient of said control signal when said ratio is less than a second threshold (S2) and/or when an angular position of said butterfly valve (F) is less than a third predetermined threshold (S3) in respect to a reference direction (X) coaxial to a body of the butterfly valve.

### Claim 4 (depends on 1)

The method according to claim 1, wherein said first and second limiting filter of the position gradient is adapted to limit the sweeping degrees from said butterfly valve over time.

### Claim 5 (depends on 4)

The method according to claim 4, wherein said first and second limiting filter consist in a saturator for a derivative of said control signal.

### Claim 6 (depends on 1)

A control device (ECU) of a butterfly valve (F) of an internal combustion engine, arranged to filter a control signal of the position of said butterfly valve according to claim 1.

### Claim 7

An internal combustion engine comprising a butterfly valve (F) on a relative suction duct, a first pressure sensor (P1) arranged upstream of the butterfly valve, a temperature sensor arranged immediately upstream or downstream of said butterfly valve, an actuator for said butterfly valve and a position sensor (SA) adapted to measure a position of said butterfly valve in respect to a reference position (X), wherein the engine comprises a device arranged to limit an opening speed of said butterfly valve only when a ratio between a measured pressure upstream and a target pressure (Pressure_air_Target) exceeds a predetermined threshold (S1).