US 6,374,813 B1 · Valve during apparatus and method for internal combustion engine

Abstract

In an internal combustion engine having a plurality of electromagnetically driven valves for each cylinder, when an required EGR amount Er is relatively small during an exhaust gas recirculation performed independently of the exhaust stroke, a first exhaust gas recirculation mode is entered by driving only a first exhaust valve of each cylinder. An open valve duration Td1 for achieving the required EGR amount Er in a one-valve drive manner is longer than a corresponding open valve duration in a two-valve drive manner. Therefore, even if the required EGR amount Er is small, a “one-valve drive in pattern 1” mode can be achieved provided that Td1>a. That is, the incidence of performing the control in pattern 2, which allows only a narrow range of control, can be reduced. Hence, degradation of controllability can be prevented even if the required EGR amount Er is small.

Claims15

Dependent claims

A valve driving apparatus for an internal combustion engine wherein the engine includes a plurality of electromagnetically operated exhaust valves for each cylinder of the engine, the plurality of exhaust valves including a least one first exhaust valve and a least one second exhaust valve, the valve driving apparatus comprising:

an exhaust valve driver which, in a first exhaust gas recirculation mode when exhaust gas recirculation is performed independently of an exhaust stroke, drives the at least one first exhaust valve and does not drive the at least one second exhaust valve;
and
an exhaust gas recirculation amount calculator that determines a required exhaust gas recirculation amount in accordance with an operational condition of the engine,
wherein the exhaust valve driver operates under the first exhaust gas recirculation mode when the required exhaust gas recirculation amount is less than a recirculation amount criterion and wherein, when the required exhaust gas recirculation amount is greater than the recirculation amount criterion, the exhaust valve driver operates under a second exhaust gas recirculation mode exhaust gas recirculation driving all of the exhaust valves for each cylinder.

1 more element

A valve driving method for an internal combustion engine in which each cylinder of the engine is provided with a plurality of electromagnetically operated exhaust valves, the plurality of exhaust valves including at least one first exhaust valve and at least one second exhaust valve, the method comprising the steps of:

performing exhaust gas recirculation by driving, when exhaust gas recirculation is performed independently of an exhaust stroke, the at least one first exhaust valve of each cylinder while not driving the at least one second exhaust valve of each cylinder;
and
determining a required exhaust gas recirculation amount in accordance with an operational condition of the engine,
wherein, when the required exhaust gas recirculation amount is less than a recirculation amount criterion, exhaust gas recirculation is performed by driving only the at least one first exhaust valve, and wherein when the required exhaust gas recirculation amount is greater than the recirculation amount criterion, exhaust gas recirculation is performed by driving all of the exhaust valves for each cylinder.

1 more element

Dependencies are inferred from the claim text.

Valve during apparatus and method for internal combustion engine

Life of this patent

Valve during apparatus and method for internal combustion engine

Life of this patent

Abstract

Claims15