Back to results
US 10,851,757 B2Granted
Ignition timing controller and control method for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTakayuki Hosogi, Rihito Kaneko, Kenji Senda, Norihito Hanai, Hisayuki Ito, Masaaki Yamaguchi
Life of this patent
Estimating the term…
Abstract
A CPU advances ignition timing within a range in which knocking can be suppressed by feedback control based on an output signal of a knocking sensor. The CPU sets the igniting timing based on a feedback adjustment amount and a learning value. The CPU limits timing advancing update of the learning value when an exhaust pressure is higher than or equal to a threshold.
Claims10
An ignition timing controller for an internal combustion engine, wherein
- the internal combustion engine includes
- an EGR passage that connects an exhaust passage and an intake passage to each other, and
- an EGR valve that adjusts a cross-sectional flow area in the EGR passage,
- the ignition timing controller is configured to execute:
- an EGR control process of performing an open-loop control of a ratio of exhaust gas flowing into the intake passage from the EGR passage to fluid that is drawn into the intake passage by operating the EGR valve;
- and
- a feedback process of operating an ignition device by advancing ignition timing within a range in which knocking can be suppressed by feedback control based on an output signal of a knocking sensor, and
- the feedback process includes
- an update process of updating a learning value based on an adjustment amount of the feedback control,
- a setting process of setting the ignition timing based on the adjustment amount and the learning value, and
- an update limiting process of limiting timing advancing update of the learning value in a case in which a pressure of exhaust gas flowing into the EGR passage is high as compared with a case in which the pressure of the exhaust gas is low.
8 more elements
An ignition timing controller for an internal combustion engine, wherein
- the internal combustion engine includes
- an EGR passage that connects an exhaust passage and an intake passage to each other, and
- an EGR valve that adjusts a cross-sectional flow area in the EGR passage,
- the ignition timing controller comprises circuitry that is configured to execute:
- an EGR control process of performing an open-loop control of a ratio of exhaust gas flowing into the intake passage from the EGR passage to fluid that is drawn into the intake passage by operating the EGR valve;
- and
- a feedback process of operating an ignition device by advancing ignition timing within a range in which knocking can be suppressed by feedback control based on an output signal of a knocking sensor, and
- the feedback process includes
- an update process of updating a learning value based on an adjustment amount of the feedback control,
- a setting process of setting the ignition timing based on the adjustment amount and the learning value, and
- an update limiting process of limiting timing advancing update of the learning value in a case in which a pressure of exhaust gas flowing into the EGR passage is high as compared with a case in which the pressure of the exhaust gas is low.
8 more elements
An ignition timing control method for an internal combustion engine, wherein
- the internal combustion engine includes
- an EGR passage that connects an exhaust passage and an intake passage to each other, and
- an EGR valve that adjusts a cross-sectional flow area in the EGR passage,
- the ignition timing control method comprises:
- performing an open-loop control of a ratio of exhaust gas flowing into the intake passage from the EGR passage to fluid that is drawn into the intake passage by operating the EGR valve;
- and
- executing a feedback process of operating an ignition device by advancing ignition timing within a range in which knocking can be suppressed by feedback control based on an output signal of a knocking sensor, and
- the feedback process includes
- an update process of updating a learning value based on an adjustment amount of the feedback control,
- a setting process of setting the ignition timing based on the adjustment amount and the learning value, and
- an update limiting process of limiting timing advancing update of the learning value in a case in which a pressure of exhaust gas flowing into the EGR passage is high as compared with a case in which the pressure of the exhaust gas is low.
8 more elements
Dependencies are inferred from the claim text.