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Patent EP0338729A1 successfully refreshed from Google Patents.
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EP0338729A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method for controlling valve operation in an internal combustion engine

Assignee: Honda Motor Co Ltd
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Filing: 1989-04-13
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Granted: —
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Expires: 2009-04-13
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Abstract

Abstract A method of controlling the operation of engine valves in an internal combustion engine, dependent on the rotational speed of the engine, involves controlling a valve operation changing mechanism (10) capable of opening and closing the engine valves selectively in a low-speed mode of operation corresponding to low-speed operation of the engine and a high-speed mode of operation corresponding to high-speed operation of the engine. The method includes the steps of determining the rotational speed (Ne of the engine at which the output torque (T) produced by the engine when the valve operation changing mechanism (10) is in the low-speed mode of operation and the output torque (T) produced by the engine when the valve operation changing mechanism is in the high-speed mode of operation are of a certain relationship to each other; and selecting a switching rotational speed for switching operation of the valve operation changing mechanism based on said determined engine rotational speed.

Inventors

  • 👤 Noriyuki Kishi

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-31 13:24
CPC Classifications
F; F02; F02D; F02D13/00; F02D13/02; F02D13/0223; F01; F01L; F01L1/00; F01L1/26; F01L1/267; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 149 words
A method of controlling operation of engine valves in an internal combustion engine, dependent on the rotational speed of the engine, by controlling a valve operation changing mechanism capable of opening and closing the engine valves selectively in a low-speed mode of operation corresponding to low-speed operation of the engine and a high-speed mode of operation corresponding to high-speed operation of the engine, said method comprising the steps of: determining a rotational speed of the engine at which an output torque produced by the engine when the valve operation changing mechanism is in the low-speed mode of operation and an output torque produced by the engine when the valve operation changing mechanism is in the high-speed mode of operation are of a certain relationship to each other; and selecting a switching rotational speed for switching operation of the valve operation changing mechanism based on said determined engine rotational speed.
Claim 2
Independent Claim 149 words
A method of controlling operation of engine valves in an internal combustion engine, dependent on the rotational speed of the engine, by controlling a valve operation changing mechanism capable of opening and closing the engine valves selectively in a low-speed mode of operation corresponding to low-speed operation of the engine and a high-speed mode of operation corresponding to high-speed operation of the engine, said method comprising the steps of: determining a rotational speed of the engine at which an output torque produced by the engine when the valve operation changing mechanism is in the low-speed mode of operation and an output torque produced by the engine when the valve operation changing mechanism is in the high-speed mode of operation are of a certain relationship to each other; and selecting a switching rotational speed for switching operation of the valve operation changing mechanism based on said determined engine rotational speed.
Claim 3
Dependent Claim 134 words
A method according to claim 1, further including the steps of: selecting a high-/low-speed-mode switching rotational speed for switching the valve operation changing mechanism from the high-speed mode of operation to the low-speed mode of operation based on the determined engine rotational speed at which the output torque produced by the engine when the valve operation changing mechanism is in the low-speed mode of operation and the output torque produced by the engine when the valve operation changing mechanism is in the high-speed mode of operation are equal to each other; and selecting a rotational speed which is higher than said high-/low-speed-mode switching rotational speed by a constant value, as a low-/high-speed-mode switching rotational speed for switching the valve operation changing mechanism from the low-speed mode of operation to the high-speed mode of operation.
Claim 4
Dependent Claim 32 words
A method according to claim 1 or 2, further including the steps of: detecting operating conditions of the engine and using said detected operating conditions for modifying said determined engine rotational speed.

References Cited (Backward Citations)

US4535732A Cited
EP0268433A1 Cited
EP0297791A1 Cited
EP0300679A1 Cited

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