Internal combustion engine with altitude compensation device
AssigneesNippondenso Co., Ltd., Toyota Jidosha Kogyo Kabushiki Kaisha
InventorsKenji Yamada, Akira Takata, Akira Ii, Katsuhiko Ohiwa
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Abstract
An altitude compensation device for an internal combustion engine having a vacuum-operated ignition timing advancer and a carburetor has an atmospheric pressure variation responsive valve operative to control the air bleed of the carburetor and the vacuum fed to the vacuum advancer such that, as the atmospheric air pressure is lowered due to increase of the altitude, the air flow into the advancer vacuum chamber is decreased to advance the ignition timing while the air flow into the carburetor air bleed passage is increased to increase the air-fuel ratio of the air-fuel mixture produced by the carburetor.
Claims9
An internal combustion engine including an intake system having a throttle valve disposed therein, a vacuum-operated ignition timing advancer having a vacuum chamber pneumatically connected by a vacuum line to a vacuum port formed in said intake system downstream of said throttle valve, a pressure regulator disposed in said vacuum line and being operative to produce an output vacuum of a substantially constant vacuum level to be introduced into said vacuum chamber, and means continuously responsive to variation in the atmospheric pressure to continuously control the pressure level in said vacuum chamber such that the ignition timing is advanced as the atmospheric pressure is reduced.
Dependencies are inferred from the claim text.