Turbocharger-equipped engine and method for operaing turbocharger-equipped engine

A turbocharger and engine technology, applied in machine/engine, combustion engine, engine control and other directions, can solve problems such as reduced efficiency, and achieve the effect of improving efficiency and improving engine output

Inactive Publication Date: 2019-05-03
YAMAHA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the compressor is used at a reduced efficiency when the air flow exceeds half of the air flow required at maximum output

Method used

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  • Turbocharger-equipped engine and method for operaing turbocharger-equipped engine
  • Turbocharger-equipped engine and method for operaing turbocharger-equipped engine
  • Turbocharger-equipped engine and method for operaing turbocharger-equipped engine

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Embodiment Construction

[0017] Below, use Figure 1 ~ Figure 3 One embodiment of an engine with a turbocharger and a method of operating the engine with a turbocharger according to the present invention will be described in detail.

[0018] figure 1 The shown engine 1 is a 4-stroke single-cylinder engine or a 4-stroke multi-cylinder engine, comprising cylinders 2 , pistons 3 and cylinder heads 4 .

[0019] The cylinder head 4 forms a combustion chamber 5 together with the above-mentioned cylinder 2 and piston 3 . Combustion chamber 5 is surrounded by cylinder 2 , piston 3 and cylinder head 4 .

[0020] The cylinder head 4 is formed with an intake port 6 and an exhaust port 7, and is provided with an intake valve 8, an exhaust valve 9, a spark plug 10, a fuel injector 11, and the like. The downstream end of the suction port 6 communicates with the combustion chamber 5 , and the upstream end communicates with the buffer tank 12 . The upstream end of the exhaust port 7 communicates with the combusti...

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Abstract

A turbocharger-equipped engine comprises: an intake port (6) and an exhaust port (7), which are connected to a combustion chamber (5); a surge tank (12); and a turbocharger (21) having a turbine (24)located at a position along the length of an exhaust passage (13), the turbocharger (21) also having a compressor (22) rotating with the turbine (24). The turbocharger-equipped engine further comprises: a waste gate valve (26) for regulating the supercharging pressure of the turbocharger (21); a throttle valve (15) provided in an intake passage (17) between the compressor (22) and the surge tank (12); and a control device (14) for controlling the operation of both a control valve and the throttle valve (15). When the engine is operated in a full-load operation range, the control device (14) sets the maximum degree of opening of the throttle valve (15) to the degree of opening closer to the closed side than the degree of opening corresponding to a fully opened throttle position and controlsthe throttle valve (15) so that the compressor efficiency of the compressor (22) will be higher than compressor efficiency corresponding to the fully opened throttle position. The compressor has increased efficiency when the engine is operated in the full-load operation range, and the output of the engine is further increased.

Description

technical field [0001] The present invention relates to an engine with a turbocharger and a method of operating the engine with a turbocharger for electronically controlling a throttle valve and an exhaust valve. Background technique [0002] Conventionally, when full-load performance is required in a gasoline engine with a turbocharger, the throttle valve opening is operated wide open (WOT) except for a low rotation range (below 3000 rpm, etc.). The torque is controlled by increasing or decreasing the opening degree of the wastegate valve to adjust the supercharging pressure of the turbo. [0003] Generally, a compressor of a turbocharger used in such an engine is designed to have the highest efficiency at an air flow rate that is approximately half of the air flow rate at which the engine generates the highest output. Therefore, when the air flow rate of this compressor exceeds half of the air flow rate required for the maximum output, the efficiency is reduced. Content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D9/02F02B37/12F02B37/18
CPCF02B37/12F02D9/02F02B37/18F02B2037/122Y02T10/12
Inventor 山田健
Owner YAMAHA MOTOR CO LTD
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