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AssigneesToyota Jidosha Kabushiki Kaisha, Denso Corporation
InventorsAkira Hashizume, Keizo Hiraku, Hirohiko Yamada
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If a valve timing adjusting mechanism has a problem, an ECU determines whether or not actual valve timing VTa is larger than valve timing advanced angle limit value VTegr. Depending on the determination, the ECU selects a value for target valve operating angle VLt from safety angles including intermediate valve operating angle VLmid and maximum valve operating angle VLmax. Each of the safety angles VLmid, VLmax is a valve operating angle at which engine combustion is stabilized at the current valve timing. With the valve operating angle fixed at the safety angle VLmid or VLmax, a throttle valve controls intake air amount. This prevents the engine combustion from becoming unstable, thus enabling the engine to be operated in an engine safety mode.
An intake air amount control method for an internal combustion engine having a variable valve system, the variable valve system including a variable valve timing system and a variable valve operating angle system, the variable valve timing system varying valve timing of at least one of an intake valve and an exhaust valve provided in the engine, the variable valve operating angle system varying a valve operating angle of the intake valve, the method comprising:
An intake air amount control method for an internal combustion engine having a variable valve system and a throttle valve driving system, the variable valve system including a variable valve timing system and a variable valve operating angle system, the variable valve timing system varying valve timing of at least one of an intake valve and an exhaust valve provided in the engine, the variable valve operating angle system varying a valve operating angle of the intake valve, the throttle valve driving system adjusting an opening size of a throttle valve disposed in an intake system of the engine, the method comprising:
An intake air amount control apparatus for an internal combustion engine having a variable valve system, the variable valve system including a variable valve timing system and a variable valve operating angle system, the variable valve timing system varying valve timing of at least one of an intake valve and an exhaust valve provided in the engine, the variable valve operating angle system varying a valve operating angle of the intake valve and controlling an intake air amount for the engine by adjusting the valve operating angle of the intake valve, the apparatus comprising:
An intake air amount control apparatus for an internal combustion engine having a variable valve system and a throttle valve driving system, the variable valve system including a variable valve timing system and a variable valve operating angle system, the variable valve timing system varying valve timing of at least one of an intake valve and an exhaust valve provided in the engine, the variable valve operating angle system varying a valve operating angle of the intake valve, the throttle valve driving system adjusting an opening size of a throttle valve disposed in an intake system of the engine, the variable valve operating angle system controlling an intake air amount for the engine by adjusting the valve operating angle of the intake valve when the engine is operated normally, the apparatus comprising:
Dependencies are inferred from the claim text.