US 4,308,831 AGranted

Internal combustion engine

AssigneeNissan Motor Co., Ltd.

InventorsFukashi Sugasawa, Haruhiko Iizuka

Life of this patent

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Abstract

An internal combustion engine is disclosed which comprises a plurality of cylinders split into first and second groups, an intake passage provided therein with a throttle valve and divided downstream of the throttle valve into first and second branches, the first branch leading to the first group of cylinders, the second branch leading to the second group of cylinders, an EGR passage bypassing the second group of cylinders, an EGR valve provided in the EGR passage for allowing re-introduction of exhaust gases through the EGR passage into the second group of cylinders when the engine is under low load conditions, a check valve provided in the second branch of the intake passage, and the check valve adapted to allow air to flow from the intake passage into the second branch but to prevent exhaust gases from flowing from the second branch into the intake passage.

Claims3

Dependent claims

An internal combustion engine comprising:

(a) first and second cylinder units each including at least one cylinder;
(b) an intake passage provided therein with a throttle valve and divided downstream of said throttle valve into first and second branches, said first branch leading to said first cylinder unit, said second branch leading to said second cylinder unit;
(c) an exhaust passage for said first and second cylinder units;
(d) a check valve provided in said intake passage second branch, said check valve being operable in response to a pressure differential between opposite sides thereof for opening only when the pressure on the upstream side thereof is higher than the pressure on the downstream side thereof;
(e) an EGR passage having one end opening into said exhaust passage and another end thereof opening into said intake passage second branch downstream of said check valve;
(f) an EGR valve provided in said EGR passage;
and
(g) means, responsive to low engine load conditions, for disabling said second cylinder unit and opening said EGR valve to permit recirculation of exhaust gases into said intake passage second branch.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/090,052Filed 31 Oct 1979
Priority: JP 53-15400412 Dec 1978
Granted: 5 Jan 1982
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F02D 21/08
Peculiar to engines having other non-fuel gas added to combustion air: the other gas being the exhaust gas of engine
F02D 17/02
Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling: cutting-out
F02D 41/0087
Controlling each cylinder individually: selective cylinder activation, i.e. partial cylinder operation
F02M 26/43
Having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders: in which exhaust from only one cylinder…