System and method for controlling operation of a two-stroke engine having a turbocharger

Patent metadata

Field	Value
Publication number	US-11384697-B2
Application number	US-202117145298-A
Country	US
Kind code	B2
Filing date	Jan 9, 2021
Priority date	Jan 13, 2020
Publication date	Jul 12, 2022
Grant date	Jul 12, 2022

Abstract

A method and system for controlling operation of a two-stroke engine having a turbocharger includes the two-stroke engine comprising an electronically controlled exhaust valve. A throttle position sensor generates a throttle position signal corresponding to a position of a throttle plate of a throttle. A boost box is coupled to the two-stroke engine. A boost box pressure sensor is coupled to the boost box and generates a boost box pressure signal corresponding to a pressure within the boost box. A controller is coupled to the boost box pressure signal controlling a position of the electronically controlled exhaust valve in response to the boost box pressure signal and the throttle position signal.

First claim

What is claimed:

1. A system for controlling operation of a two-stroke engine having a turbocharger comprising:
the two-stroke engine comprising an electronically controlled exhaust valve;
a throttle position sensor generating a throttle position signal corresponding to a position of a throttle plate of a throttle;
a boost box coupled to the two-stroke engine;
a boost box pressure sensor coupled to the boost box generating a boost box pressure signal corresponding to a pressure within the boost box; and
a controller coupled to the boost box pressure signal controlling a position of the electronically controlled exhaust valve in response to the boost box pressure signal and the throttle position signal.

2. The system of claim 1 wherein the controller determines an engine speed threshold, at which the exhaust valve is commanded to move.

3. The system of claim 2 wherein the engine speed threshold for exhaust valve position is determined from a table.

4. The system of claim 2 wherein the controller controls the electronically controlled exhaust valve in response to the engine speed.

5. The system of claim 2 wherein the engine speed threshold for exhaust valve position is based on a barometric pressure signal and the throttle position signal.

6. A method or controlling operation of a two-stroke engine having a turbocharger comprising:
generating a throttle position signal corresponding to a position of a throttle plate from a throttle position sensor;
generating a boost box pressure signal corresponding to a pressure within a boost box; and
controlling a position of an electronically controlled exhaust valve in response to the boost box pressure signal and the throttle position signal.

7. The method of claim 6 further comprising determining an engine speed threshold, and commanding movement of the exhaust valve at the engine speed.

8. The method of claim 7 wherein determining the engine speed threshold comprises determining the engine speed threshold for exhaust valve position from a table.

9. The method of claim 7 wherein controlling by a controller, the electronically controlled exhaust valve in response to the engine speed.

10. The method of claim 7 wherein determining the engine speed comprises determining the engine speed based on a barometric pressure signal and the throttle position signal.

Assignees

• Polaris Inc

Inventors

• Buchwitz James H
• Blake Dallas J
• Salfer Lucas R
• Hetteen Alexander M
• Hanson Reed A
• Hedlund Darren J
• Erickson Daniel E
• Dale Chad A
• Zimney Derek D

Classifications

• F01N13/1805

  Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body (pipe joints in general F16L; fixing auxiliaries in motor vehicles in general B60K) · CPC title

• F02D9/04

  concerning exhaust conduits (throttle valves, or arrangements thereof in conduits F02D9/08) · CPC title

• F02B37/186

  Arrangements of actuators or linkage for bypass valves · CPC title

• F02D41/0007 Primary

  for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12) · CPC title

• Y02T10/40

  Engine management systems · CPC title