# US 7,610,140 B2 · Vehicular ejector system and control method thereof

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- Number: US 7,610,140 B2
- Document ID: US7610140B2
- Status: Granted
- Kind: B2
- Application number: 11/808,234
- Filed: 2007-06-07
- Published: 2007-12-27
- Granted: 2009-10-27
- Earliest claimed: 2006-06-09
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Inventors: Shigemasa Hirooka
- Web page: https://patentgrep.com/patent/US7610140B2

## CPC

- F02D 31/003: {for idle speed control}
- B60T 17/02: Arrangements of pumps or compressors, or control devices therefor
- F02D 41/083: {taking into account engine load variation, e.g. air-conditionning}
- F02M 35/10229: {the intake system acting as a vacuum or overpressure source for auxiliary devices, e.g. brake systems; Vacuum chambers (air storage chamber F02B21/00)}
- 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)
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

A vehicular ejector system having an ejector that generates a negative pressure that is greater than the intake manifold negative pressure that is to be extracted from an intake manifold, a VSV that causes the ejector to function or stop functioning, and an ECU that controls the VSV. The ECU includes a control device that controls the VSV so as to cause the ejector to function if an ISC request amount for controlling, during idling, a throttle valve that adjusts the intake air flow amount supplied to the internal combustion engine is greater than a predetermined amount.

## Claims

### Claim 1

A control method of a vehicular ejector system including an ejector that generates a negative pressure that is greater than the negative pressure that is to be extracted from an intake passageway of an intake system of the internal combustion engine; a state change device that causes the ejector to function or stop functioning; and a control device that controls the state change device, the control method comprising:
determining whether or not an idle control is being performed in the internal combustion engine;
determining whether or not an idle speed control request amount used to adjust an intake air flow amount supplied to the internal combustion engine during idling is greater than a predetermined value if the idle control is being performed; and
controlling the state change device so as to cause the ejector to function if the idle speed control request amount is greater than the predetermined value.

### Claim 2

A vehicular ejector system comprising:
an ejector that generates a negative pressure that is greater than the negative pressure that is to be extracted from an intake passageway of an intake system of the internal combustion engine;
a state change device that causes the ejector to function or stop functioning; and
a control device that controls the state change device,
wherein when an idle speed control request amount for controlling a flow amount adjustment device that adjusts an intake air flow amount supplied to the internal combustion engine during idling is greater than a predetermined amount, the control device controls the state change device so as to cause the ejector function.

### Claim 3 (depends on 2)

The vehicular ejector system according to claim 2, wherein the control device has a control prohibition portion that prohibits the state change device from being controlled so as to cause the ejector to function if water temperature of a cooling water of the internal combustion engine is less than or equal to a predetermined temperature.

### Claim 4 (depends on 2)

The vehicular ejector system according to claim 2, wherein the control device has a predetermined amount correction portion that corrects the predetermined amount in accordance with a condition for a change in the magnitude of the negative pressure to be extracted from the intake passageway although a state of the flow amount adjustment device remains the same.

### Claim 5 (depends on 4)

The vehicular ejector system according to claim 4, wherein the condition is based on the magnitude of atmospheric pressure.

### Claim 6 (depends on 4)

The vehicular ejector system according to claim 4, wherein the condition is based on opening degree of an air flow control valve that is disposed in the intake passageway of the intake system of the internal combustion engine.

### Claim 7 (depends on 4)

The vehicular ejector system according to claim 4, wherein the condition is based on rotation speed of the internal combustion engine.

### Claim 8 (depends on 7)

The vehicular ejector system according to claim 7, wherein the condition is based on the magnitude of atmospheric pressure.