# US 2019/0170058 A1 · Turbocharged engine and method of operating turbocharged engine

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- Number: US 2019/0170058 A1
- Document ID: US20190170058A1
- Status: Published application
- Kind: A1
- Application number: 16/325,194
- Filed: 2017-06-29
- Published: 2019-06-06
- Earliest claimed: 2016-09-15
- Assignees: Yamaha Hatsudoki Kabushiki Kaisha
- Applicants: Yamaha Hatsudoki Kabushiki Kaisha
- Inventors: Takeshi YAMADA
- Web page: https://patentgrep.com/patent/US20190170058A1

## CPC

- F02B 37/18: by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere}
- F02B 37/12: Control of the pumps
- F02D 9/02: concerning induction conduits (throttle valves, or arrangements thereof in conduits F02D9/08)
- F02B 2037/122: {Control of rotational speed of the pump}
- Y02T 10/12: Improving ICE efficiencies
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- 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 turbocharged engine includes an intake port and an exhaust port connected to a combustion chamber, a surge tank, and a turbocharger including a turbine installed midway in an exhaust passage and a compressor that rotates together with the turbine. The turbocharged engine further includes a wastegate valve that controls the supercharging pressure of the turbocharger, a throttle valve installed in an intake passage between the compressor and surge tank, and a controller to control the operations of a control valve and the throttle valve. When the engine operation range is in a full-load operation range, the controller sets the maximum opening degree of the throttle valve to an opening degree less than a full-throttle opening degree, and controls the throttle valve so that the compressor efficiency of the compressor is higher than a full-throttle compressor efficiency. When the engine operation range is in the full-load operation range, the compressor efficiency increases, so the engine output is further increased.

## Claims

### Claim at position 1

1-2. (canceled)

### Claim 3

A turbocharged engine comprising:
an intake port including a downstream end connected to a combustion chamber;
a surge tank in communication with an upstream end of the intake port;
an exhaust port including an upstream end connected to the combustion chamber;
an exhaust passage in communication with a downstream end of the exhaust port;
a turbocharger including a turbine installed in the exhaust passage, and a compressor that rotates together with the turbine;
a control valve that controls a supercharging pressure of the turbocharger;
an intake passage that guides air discharged from the compressor to the surge tank;
a throttle valve installed in the intake passage; and
a controller configured or programmed to control operations of the control valve and the throttle valve; wherein
the controller is configured or programmed to control the throttle valve to set a maximum opening degree of the throttle valve to an opening degree less than a full-throttle opening degree, such that a compressor efficiency of the compressor is higher than a full-throttle compressor efficiency when an engine operation range is in a full-load operation range.

### Claim 4

A method of operating a turbocharged engine including a turbocharger that supercharges air in an intake passage of an engine including a throttle valve, the method comprising:
determining whether or not an engine operation range is in a full-load operation range;
controlling a supercharging pressure of the turbocharger to a predetermined supercharging pressure with a control valve when the engine operation range is not in the full-load operation range; and
controlling the supercharging pressure of the turbocharger to a predetermined supercharging pressure with the control valve, and controlling the throttle valve to set a maximum opening degree of the throttle valve to an opening degree less than a full-throttle opening degree, such that a compressor efficiency of a compressor in the turbocharger is higher than a full-throttle compressor efficiency when the engine operation range is in the full-load operation range.