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US 10,465,624 B2Granted
Start-up control device for engine
AssigneesToyota Jidosha Kabushiki Kaisha, Fujitsu Ten Limited
InventorsYusuke Suzuki, Kunihiko Usui, Kazuya Koyama
Life of this patent
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Abstract
When a crankshaft reversely rotates immediately before a stoppage of an engine, the amount of fuel injection in a cylinder in an expansion stroke is controlled to acquire a target air-fuel ratio in accordance with the amount of air in the cylinder. When the electronic control unit determines that the exhaust valve is opened at the time of reverse rotation, the amount of fuel injection is determined by considering a change in the amount of air due to exchange of gas with an exhaust path.
Claims16
A start-up control device for an engine, the device comprising:
- circuitry configured to:
- start up a direct injection engine by executing fuel injection and ignition into a cylinder in an expansion stroke when a restart condition is established immediately before the engine stops;
- and
- when a crankshaft reversely rotates before a rotation of the crankshaft stops:
- determine whether or not an exhaust valve of the cylinder in the expansion stroke is opened at a time of the reverse rotation of the crankshaft,
- determine an amount of fuel injection in accordance with a change in an amount of air in the cylinder in the expansion stroke due to exchange of gas with an exhaust path via the exhaust valve of the cylinder in the expansion stroke such that an air-fuel ratio of a mixture of fuel and the air reaches a target air-fuel ratio when it has been determined that the exhaust valve of the cylinder in the expansion stroke is opened at the time of the reverse rotation of the crankshaft,
- cause a fuel injection valve to inject the fuel in accordance with the determined amount of fuel injection into the cylinder in the expansion stroke, and
- ignite the fuel in the cylinder,
- wherein reversely rotates includes rotation in a direction opposite to that in which the crankshaft rotates as a result of the start up, and
- wherein the circuitry is configured to calculate the amount of air in the cylinder in the expansion stroke based on an opening timing of the exhaust valve of the cylinder in the expansion stroke when it has been determined that the exhaust valve of the cylinder in the expansion stroke is opened at the time of the reverse rotation of the crankshaft.
7 more elements
A start-up control device for an engine, the device comprising:
- circuitry configured to:
- start up a direct injection engine by executing fuel injection and ignition into a cylinder in an expansion stroke when a restart condition is established immediately before the engine stops;
- and
- when a crankshaft reversely rotates before a rotation of the crankshaft stops:
- determine whether or not an exhaust valve of the cylinder in the expansion stroke is opened at a time of the reverse rotation of the crankshaft,
- determine an amount of fuel injection in accordance with a change in an amount of air in the cylinder in the expansion stroke due to exchange of gas with an exhaust path via the exhaust valve of the cylinder in the expansion stroke such that an air-fuel ratio of a mixture of fuel and the air reaches a target air-fuel ratio when it has been determined that the exhaust valve of the cylinder in the expansion stroke is opened at the time of the reverse rotation of the crankshaft,
- cause a fuel injection valve to inject the fuel in accordance with the determined amount of fuel injection into the cylinder in the expansion stroke, and
- ignite the fuel in the cylinder,
- wherein reversely rotates includes rotation in a direction opposite to that in which the crankshaft rotates as a result of the start up, and
- wherein the circuitry is configured to calculate the amount of air in the cylinder in the expansion stroke based on at least one of a valve open period of the exhaust valve of the cylinder in the expansion stroke and an opening degree of the exhaust valve of the cylinder in the expansion stroke when it has been determined that the exhaust valve of the cylinder in the expansion stroke is opened at the time of the reverse rotation of the crankshaft.
7 more elements
Dependencies are inferred from the claim text.