# US 8,783,231 B2 · Venturi for vapor purge

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- Number: US 8,783,231 B2
- Document ID: US8783231B2
- Status: Granted
- Kind: B2
- Application number: 13/418,198
- Filed: 2012-03-12
- Published: 2013-09-12
- Granted: 2014-07-22
- Earliest claimed: 2012-03-12
- Assignees: Ford Global Technologies, LLC
- Applicants: Thomas G. Leone
- Inventors: Thomas G. Leone
- Web page: https://patentgrep.com/patent/US8783231B2

## CPC

- F02M 25/0872: {Details of the fuel vapour pipes or conduits}
- F02D 41/0002: {Controlling intake air}
- F02D 41/003: {Adding fuel vapours, e.g. drawn from engine fuel reservoir}
- F02D 41/0032: {Controlling the purging of the canister as a function of the engine operating conditions}
- F02D 41/004: {Control of the valve or purge actuator, e.g. duty cycle, closed loop control of position}
- F02D 41/0045: {Estimating, calculating or determining the purging rate, amount, flow or concentration}
- F02M 25/08: adding fuel vapours drawn from engine fuel reservoir {(electrical control of purge system F02D41/003)}
- F02D 41/0087: {Selective cylinder activation, i.e. partial cylinder operation (deceleration cut-off F02D41/123)}
- F02D 41/042: {for stopping the engine}
- Y02T 10/40: Engine management systems
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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

Systems and methods for an engine comprising a venturi coupled in an intake of the engine are provided. In one example approach, a method of controlling operation of an engine having a fuel vapor purging system comprises: directing intake air through a first throttle and a venturi disposed in a bypass conduit coupled around an intake of the engine upstream and downstream of a second throttle disposed in the intake; and in response to an operating condition, delivering fuel vapor flow from the fuel vapor purging system to an inlet of the venturi.

## Claims

### Claim 1

A method of controlling operation of an engine having a fuel vapor purging system, comprising:
directing intake air through a first throttle and a venturi disposed in a bypass conduit coupled in parallel around a second throttle disposed in the intake;
in response to an operating condition, delivering fuel vapor flow from the fuel vapor purging system to an inlet of the venturi; and
adjusting an amount of fuel vapor flow delivered to the inlet of the venturi via a fuel vapor purging valve coupled to the fuel vapor purging system based on an air flow rate through the venturi and an air temperature and pressure.

### Claim 2 (depends on 1)

The method of claim 1, wherein the venturi is coupled to the bypass conduit downstream of the first throttle.

### Claim 3 (depends on 1)

The method of claim 1, wherein the venturi is coupled to the bypass conduit upstream of the first throttle.

### Claim 4 (depends on 1)

The method of claim 1, further comprising, in response to an engine load less than a threshold, adjusting the first throttle to attain a desired torque while keeping the second throttle substantially closed.

### Claim 5 (depends on 1)

The method of claim 1, further comprising, in response to an engine load greater than a threshold when the second throttle is not in a wide open throttle state, adjusting the second throttle to attain a desired torque while keeping the first throttle substantially fixed in a partially open state.

### Claim 6 (depends on 1)

The method of claim 1, further comprising, in response to an engine load greater than a threshold when the second throttle is in a substantially wide open throttle state, adjusting the first throttle to attain a desired torque while keeping the second throttle in the wide open state.

### Claim 7 (depends on 1)

The method of claim 1, wherein the engine is part of a hybrid electric powertrain.

### Claim 8

A method of controlling operation of an engine having a fuel vapor purging system, comprising:
directing intake air through a first throttle and a venturi disposed in a bypass conduit coupled in parallel around a second throttle disposed in the intake;
in response to an engine load less than a threshold, adjusting the first throttle to attain a desired torque while keeping the second throttle substantially closed and in response to the engine load greater than the threshold when the second throttle is not in a wide open throttle state, adjusting the second throttle to attain the desired torque while keeping the first throttle fixed in a partially open state; and
in response to a fuel vapor purging condition, delivering fuel vapor flow from the fuel vapor purging system to an inlet of the venturi.

### Claim 9 (depends on 8)

The method of claim 8, further comprising adjusting an amount of fuel vapor flow delivered to the inlet of the venturi via a fuel vapor purging valve coupled to the fuel vapor purging system, wherein the amount of fuel vapor flow delivered to the inlet of the venturi is adjusted based on an air flow rate through the venturi and an air temperature and pressure.

### Claim 10 (depends on 8)

The method of claim 8, wherein the venturi is coupled in the bypass conduit upstream of the first throttle.

### Claim 11 (depends on 8)

The method of claim 8, further comprising, in response to the engine load greater than the threshold when the second throttle is in a substantially wide open throttle state, adjusting the first throttle to attain the desired torque while keeping the second throttle in the wide open state.

### Claim 12

An engine system comprising:
a first throttle and a venturi disposed in a bypass conduit coupled in parallel around a second throttle disposed in an intake;
a fuel vapor purge system coupled to a venturi inlet; and
a controller with instructions executable to adjust the first throttle in response to a first operating condition; and to adjust the second throttle in response to a second operating condition while fixing the first throttle's position.

### Claim 13 (depends on 12)

The system of claim 12, wherein the first throttle is upstream of the venturi.

### Claim 14 (depends on 12)

The system of claim 12, wherein the first throttle is downstream of the venturi.

### Claim 15 (depends on 12)

The system of claim 12, wherein the fuel vapor purge system is coupled to the inlet of the venturi via a fuel vapor purging conduit, and wherein the fuel vapor purging conduit includes a purge valve disposed therein.

### Claim 16 (depends on 12)

The system of claim 12, wherein the engine system is part of a hybrid electric powertrain.

### Claim 17 (depends on 12)

The system of claim 12, wherein the controller further includes instructions executable to operate an engine of the engine system with stop-start to reduce idle time.

### Claim 18 (depends on 12)

The system of claim 12, wherein the controller further includes instructions executable to operate an engine of the engine system with one or more of cylinder deactivation, variable camshaft timing, variable valve lift, turbocharging, or supercharging.