Control device for an internal combustion engine

A control device and internal combustion engine technology, applied in engine control, internal combustion piston engine, electrical control, etc., can solve the problems of catalyst temperature drop, catalyst purification performance drop, etc., and achieve the effect of suppressing excessive temperature rise

Inactive Publication Date: 2014-06-04
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is conceivable that, for example, in the case where blowby occurs during a warm-up process in which only the upstream side of the catalyst becomes active, the temperature of the catalyst drops due to the gas entering the catalyst, and even the upstream side of the catalyst is cooled, thereby Catalyst purification performance decline

Method used

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  • Control device for an internal combustion engine
  • Control device for an internal combustion engine
  • Control device for an internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0070] figure 1 It is a schematic diagram for explaining the overall configuration of the control device of the internal combustion engine and the system including its peripheral devices according to Embodiment 1 of the present invention. figure 1 The system has an internal combustion engine 2 . The internal combustion engine 2 has four cylinders #1 to #4. The internal combustion engine 2 is provided with a fuel injection valve for in-cylinder injection capable of directly injecting fuel into each cylinder.

[0071] The intake valve and the exhaust valve of each cylinder of the internal combustion engine 2 are provided with a variable valve mechanism (VVT) 4 for changing each valve opening characteristic (opening and closing timing, lift amount, etc.). The structure and operation of the VVT4 are well known, so detailed descriptions are omitted here.

[0072] An exhaust port of each cylinder is connected to an exhaust path 10 . An exhaust turbine 14 of a turbocharger 12 tha...

Embodiment approach 2

[0103] The system of Embodiment 2 has the same structure as the system of Embodiment 1. Figure 4 It is a timing chart for explaining the control content of Embodiment 2 of this invention. Figure 4 The time chart of is a control performed when not only the exhaust turbine 14 but also the entire exhaust system becomes excessively high in temperature.

[0104] Specifically, when the most downstream side and outlet temperature t1 of the exhaust system exceeds the high-temperature reference value T12 (exit high temperature reference value) at which the exhaust system may be damaged, it is conceivable that the entire purification catalyst 20 The temperature becomes high temperature. When the amount of blow-by air increases in this state, it is expected that the temperature of the purification catalyst 20 will further rise due to the reaction heat caused by the reaction of the leaked fresh air and unburned fuel, thereby damaging and deteriorating the purification catalyst 20 .

...

Embodiment approach 3

[0119] Figure 6 It is a timing chart for explaining the content of control in Embodiment 3 of the present invention. Figure 6 The content of the control is the control executed when the temperature of the purification catalyst 20 is at such a low temperature that the purification performance thereof may be degraded.

[0120] For example, when the inlet temperature of the purification catalyst 20 is near the lower limit of the active temperature range during a warm-up process, it is expected that the purification performance of the purification catalyst 20 will decrease. Furthermore, under such circumstances, it is conceivable that the temperature of the entire exhaust system including the exhaust turbine 14 drops. If the blow-by air amount is increased in such a low-temperature environment, it is expected that the temperature of the purification catalyst 20, especially the upstream part, will further drop and become lower due to the leaked low-temperature fresh air.

[012...

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Abstract

An internal combustion engine control apparatus includes means that detects an inlet temperature (t3) that is a temperature in a vicinity of an inlet of a purification catalyst (20) disposed in an exhaust path (10) and means that detects a turbine temperature (t2) that is a temperature in a vicinity of an exhaust turbine (14) of a turbosupercharger (12) disposed in the exhaust path, and also includes means that controls a valve overlap (v) that is a state in which an intake valve and an exhaust valve of the internal combustion engine are open simultaneously. When the inlet temperature (t3) is lower than an inlet high temperature reference value (T31), and the turbine temperature (t2) is higher than a turbine high temperature reference value (T21) that is higher than the inlet high temperature reference value, the valve overlap amount (v) is increased so as to be greater than a turbine high temperature time reference amount (VO).

Description

technical field [0001] The invention relates to a control device for an internal combustion engine. More specifically, it relates to a control device for an internal combustion engine including a variable valve mechanism capable of variably controlling the opening characteristics of exhaust valves and intake valves, and a turbocharger. Background technique [0002] For example, Patent Document 1 discloses a control device for an internal combustion engine including a turbocharger. In the invention of Patent Document 1, a wastegate valve (hereinafter referred to as "WGV") that detours around the turbocharger is provided on the exhaust path of the internal combustion engine. In the invention of Patent Document 1, when the valve opening request of the WGV is approved, the valve overlap amount of the intake valve and the exhaust valve is increased, for example, after the WGV is opened. On the other hand, when the valve closing request of the WGV is approved, for example, the v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D13/02F02D23/00F02D43/00F02D45/00
CPCF02D23/02F01N2410/03F02D2200/0802F02D41/0235F01N2900/1404Y02T10/144F02B2039/164F02D2041/001F02D13/0261F01N2410/02F02B37/18Y02T10/18F02D41/1441F02D41/22F01N2560/06F02D41/0007F02D41/1446Y02T10/12
Inventor 永乐玲
Owner TOYOTA JIDOSHA KK
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