Control device for engine and control method of engine

A control device for an engine that includes a crank angle sensor and a timing rotor provided on a crankshaft of the engine, the timing rotor being provided with a plurality of teeth and a toothless part where at least one of the teeth is not provided on an outer periphery of the timing rotor, the crank angle sensor being configured to output a pulse signal according to passing of the teeth of the timing rotor,

• the control device comprising
• an electronic control unit configured to:
• calculate a pulse input interval time when the pulse signal is input from the crank angle sensor;
• calculate a pulse input interval ratio, the pulse input interval ratio is a ratio of a current pulse input interval time to a previous pulse input interval time;
• and
• prohibit detection of the toothless part of the timing rotor based on the pulse signal output from the crank angle sensor when the calculated pulse input interval ratio is a value at which a predetermined toothless part determination ratio is established, in a case where the previous pulse input interval time of when the pulse input interval ratio is calculated is equal to or greater than a predetermined determination time.

A control method for an engine that includes a crank angle sensor and a timing rotor provided on a crankshaft of the engine, the timing rotor being provided with a plurality of teeth and a toothless part where at least one of the teeth is not provided on an outer periphery of the timing rotor, the crank angle sensor being configured to output a pulse signal according to passing of the teeth of the timing rotor, the engine being controlled by an electronic control unit,

• the control method comprising:
• executing, by the electronic control unit, a stop-and-start control of automatically stopping the engine when a predetermined automatic stop condition is established and automatically restarting the engine when a predetermined automatic-restart condition is established during the automatic stop of the engine;
• and
• when the automatic-restart condition is established during fuel cut-off according to the automatic stop of the engine, prohibiting, by the electronic control unit, detection of the toothless part of the timing rotor based on the pulse signal output from the crank angle sensor, for a period until the crankshaft is rotated by a predetermined crank angle or more after the automatic-restart condition is established.

A control method for an engine that includes a crank angle sensor and a timing rotor provided on a crankshaft of the engine, the timing rotor being provided with a plurality of teeth and a toothless part where at least one of the teeth is not provided on an outer periphery of the timing rotor, the crank angle sensor being configured to output a pulse signal according to passing of the teeth of the timing rotor, the engine being controlled by an electronic control unit,

• the control method comprising:
• calculating, by the electronic control unit, a pulse input interval time when the pulse signal is input from the crank angle sensor;
• calculating, by the electronic control unit, a pulse input interval ratio, the pulse input interval ratio is a ratio of a current pulse input interval time to a previous pulse input interval time;
• and
• prohibiting, by the electronic control unit, detection of the toothless part of the timing rotor based on the pulse signal output from the crank angle sensor when the calculated pulse input interval ratio is a value at which a predetermined toothless part determination ratio is established, in a case where the previous pulse input interval time of when the pulse input interval ratio is calculated is equal to or greater than a predetermined determination time.