Methods and systems for an engine

Patent metadata

Field	Value
Publication number	US-10190474-B2
Application number	US-201615179837-A
Country	US
Kind code	B2
Filing date	Jun 10, 2016
Priority date	Jun 10, 2016
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

Methods and systems are provided for an exhaust bypass valve and a heat exchanger upstream of a three-way valve. In one example, a method may include flowing exhaust gas through one or more of an exhaust passage, bypass passage, recirculating passage, and EGR passage based on positions of a three-way valve and a bypass valve.

First claim

The invention claimed is:

1. A method comprising:
flowing exhaust gas through an exhaust passage while not flowing exhaust gas through a bypass passage, a recirculating passage, and an EGR passage with a three-way valve in a fully closed position and a bypass valve in a more open position;
flowing exhaust gas through the exhaust passage and through the recirculating passage into the EGR passage, while not flowing exhaust gas through the bypass passage with a bypass portion of the three-way valve being closed and the three-way valve in the more open position; and
flowing exhaust gas through the exhaust passage and through a heat exchanger of the bypass passage into the EGR passage, while not flowing exhaust gas through the recirculating passage with a recirculating portion of the three-way valve being closed and the bypass valve in a more closed position.

2. The method of claim 1 , wherein moving the bypass valve to the more open position includes actuating a protrusion away from a similarly shaped flange along the exhaust passage, and wherein moving the bypass valve to the more closed position includes actuating the protrusion toward the flange along the exhaust passage.

3. The method of claim 1 , wherein the bypass passage is fluidly coupled to the exhaust passage upstream of the bypass valve, the recirculating passage is fluidly coupled to an interior passage of a flange of the bypass valve, and the EGR passage is fluidly coupled to an intake passage.

4. The method of claim 1 , wherein the heat exchanger is configured to cool exhaust gas flowing therethrough, and where the heat exchanger is further adapted to transfer heat received from exhaust gas passed therethrough to a heat receiving device.

5. The method of claim 1 , further comprising:
during a first mode, flowing exhaust gas through the exhaust passage while not flowing exhaust gas through the bypass passage, the recirculating passage, and the EGR passage by moving a protrusion of a bypass venturi valve to a more open position away from a flange of the bypass venturi valve and fully closing the three-way valve;
during a second mode, flowing exhaust gas through the exhaust passage and through the recirculating passage into the EGR passage, while not flowing exhaust gas through the bypass passage by moving the protrusion to the more open position away from the flange and closing the bypass portion of the three-way valve while opening recirculating and EGR portions of the three-way valve;
during a third mode, flowing exhaust gas through the exhaust passage and through the heat exchanger of the bypass passage into the EGR passage, while not flowing exhaust gas through the recirculating passage by moving the protrusion to a more closed position toward the flange and closing the recirculating portion while opening the bypass and EGR portions of the three-way valve;
during a fourth mode, flowing exhaust gas through the exhaust passage, the heat exchanger of the bypass passage, the recirculating passage, and the EGR passage by moving the protrusion to the more closed position toward the flange and opening the bypass, recirculating, and EGR portions of the three-way valve; and
during a fifth mode, flowing exhaust gas through the exhaust passage, the heat exchanger of the bypass passage, and the recirculating passage, while not flowing exhaust gas through the EGR passage by moving the protrusion to the more closed position toward the flange and opening the bypass and recirculating portions and closing the EGR portion of the three-way valve.

6. The method of claim 5 , wherein the three-way valve being fully closed includes the bypass portion, recirculating portion, and EGR portion of the three-way valve being in closed positions.

7. The method of claim 5 , wherein the protrusion further includes an intermediate position between the more open and more closed positions, and where the intermediate position provides an amount of exhaust flow to one or more of the exhaust passage, the bypass passage, the recirculating passage, and the EGR passage between amounts provided in the open position and the closed position.

Assignees

• Ford Global Tech Llc

Inventors

• Zhang Xiaogang

Classifications

• F02M26/14

  in relation to the exhaust system · CPC title

• F01N13/08 Primary

  Other arrangements or adaptations of exhaust conduits {(pipes, joints or supports therefor in general F16L; collecting or removing exhaust gases of vehicle engines in workshops B08B15/00, on highways E01C1/005)} · CPC title

• F02M26/22

  with coolers in the recirculation passage · CPC title

• F02D41/0077

  Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position (EGR valve position sensor F02M26/48) · CPC title

• F01N3/08

  for rendering innocuous (using electric or electrostatic separators F01N3/01; chemical aspects B01D53/92) · CPC title