Control apparatus for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorAkinori Morishima
Life of this patent
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Abstract
A control apparatus for an internal combustion engine that includes an intercooler and an electrically driven water pump configured to circulate cooling water so as to flow through the intercooler is configured to calculate a required intercooler cooling efficiency ηreq obtained by dividing a difference between a cooler inflow gas temperature Tgin and a cooler outflow gas temperature Tgout by a difference between the cooler inflow gas temperature Tgin and a cooling water temperature Tw. A required circulation flow rate Qwreq is calculated based on the required intercooler cooling efficiency ηreq and a cooler passing-through gas flow rate G. The electrically driven water pump is driven so that a cooling water flow rate Qw approaches the required intercooler cooling efficiency ηreq.
Claims5
A control apparatus for controlling an internal combustion engine, the internal combustion engine including:
- a cooling water flow circuit through which cooling water for cooling an intake gas of the internal combustion engine flows;
- an intercooler arranged in the cooling water flow circuit and configured to conduct heat exchange between the intake gas and the cooling water;
- and
- an electrically driven water pump arranged in the cooling water flow circuit and configured to circulate the cooling water so as to flow through the intercooler,
- the control apparatus comprising a controller, the controller being programmed to:
- (a) detect or estimate a cooler inflow gas temperature Tgin that is a temperature of the intake gas that flows into the intercooler;
- (b) detect or estimate a cooling water temperature Tw of the cooling water;
- (c) detect or estimate a cooler passing-through gas flow rate that is a flow rate of the intake gas that passes through the intercooler;
- and
- (d) calculate a required intercooler cooling efficiency ηreq that is defined by a following formula (i):
- η
-
-
- req
- =
- Tgin
- -
- T
-
-
- g
-
-
- o
-
-
- u
-
-
- t
-
-
- t
-
-
- r
-
-
- g
- Tgin
- -
- Tw
- (
- i
- )
- where, in the formula (i), Tgouttrg denotes a target temperature of a cooler outflow gas temperature that is a temperature of the intake gas that flows out from the intercooler,
- wherein the controller is further programmed to:
- (e) calculate, with a relation information that defines a relation between the required intercooler cooling efficiency ηreq, the cooler passing-through gas flow rate, and a required circulation flow rate of the cooling water required to cause the cooler outflow gas temperature to approach the target temperature Tgouttrg, the required circulation flow rate based on the required intercooler cooling efficiency ηreq and the cooler passing-through gas flow rate;
- and
- (f) drive the electrically driven water pump so that a circulation flow rate of the cooling water approaches the required circulation flow rate which is calculated.
Dependencies are inferred from the claim text.