Control device for internal combustion engine

Patent metadata

Field	Value
Publication number	US-2016348578-A1
Application number	US-201615164237-A
Country	US
Kind code	A1
Filing date	May 25, 2016
Priority date	Jun 1, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

A turbocharger that includes a turbine and a compressor, an electric supercharger that is arranged in an intake passage, and a control device that increases a rotational speed of the electric supercharger upon receipt of a torque increase request with respect to the internal combustion engine are provided. During a process in which the rotational speed of the electric supercharger is increasing, if the rotational speed arrives at a predetermined switching rotational speed “Ntec”, the control device decreases a rate of increase in the rotational speed from a first rate of increase “Nteup1” to a second rate of increase “Nteup2” (<Nteup1). At such time, the control device sets each of “Ntec” and “Nteup2” based on at least any one of an engine speed, a rate of increase in the engine speed, and a supercharging pressure difference between a target supercharging pressure and an actual supercharging pressure.

First claim

1 . A control device for an internal combustion engine that controls an internal combustion engine comprising a turbocharger having a turbine that is arranged in an exhaust passage and a compressor that is arranged in an intake passage, and an electric supercharger that is provided in the intake passage,
the control device causing a rotational speed of the electric supercharger to increase at a first rate of increase upon receipt of a torque increase request with respect to the internal combustion engine, wherein: the control device is configured so that, during a process in which a rotational speed of the electric supercharger is increasing, if the rotational speed arrives at a predetermined switching rotational speed, the control device changes a rate of increase in the rotational speed from the first rate of increase to a second rate of increase that is less than the first rate of increase; and the control device is configured to set the switching rotational speed based on at least any one of an engine speed of the internal combustion engine, a rate of increase in the engine speed, and a supercharging pressure difference between a target supercharging pressure and an actual supercharging pressure, and to also set the second rate of increase based on at least any one of the engine speed of the internal combustion engine, the rate of increase in the engine speed, and a supercharging pressure difference between a target supercharging pressure and an actual supercharging pressure.

2 . The control device for an internal combustion engine according to claim 1 , wherein the control device is configured to set the switching rotational speed to a larger value as the engine speed increases.

3 . The control device for an internal combustion engine according to claim 1 , wherein the control device is configured to set the second rate of increase to a larger value as the engine speed increases.

4 . The control device for an internal combustion engine according to claim 1 , wherein the control device is configured to set the switching rotational speed to a larger value as the rate of increase in the engine speed increases.

5 . The control device for an internal combustion engine according to claim 1 , wherein the control device is configured to set the second rate of increase to a larger value as the rate of increase in the engine speed increases.

6 . The control device for an internal combustion engine according to claim 1 , wherein the control device is configured to set the switching rotational speed to a larger value as the supercharging pressure difference increases.

7 . The control device for an internal combustion engine according to claim 1 , wherein the control device is configured to set the second rate of increase to a larger value as the supercharging pressure difference increases.

8 . The control device for an internal combustion engine according to claim 1 , comprising:
a voltage measurement apparatus that measures a voltage of an electric power storage apparatus of the internal combustion engine; wherein the control device is configured to calculate a voltage drop rate during a process in which a rotational speed of the electric supercharger is increasing, by using a voltage value that is measured by the voltage measurement apparatus, and to set the switching rotational speed and the second rate of increase so that a future voltage that is estimated based on the voltage drop rate does not become less than a predetermined minimum voltage.

Assignees

• Toyota Motor Co Ltd

Inventors

• Oyagi Hiroshi
• Takasu Yusuke

Classifications

• F02B33/40

  of non-positive-displacement type · CPC title

• F02B39/10

  electric · CPC title

• F02B37/10

  at least one pump being alternatively {or simultaneously} driven by exhaust and other drive, {e.g. by pressurised fluid from a reservoir or an engine-driven pump} · CPC title

• F02B39/16 Primary

  Other safety measures for, or other control of, pumps · CPC title

• F02B37/14

  {Control} of the alternation between {or the operation of} exhaust drive and other drive of a pump, e.g. dependent on speed · CPC title