Control device of automatic engine stop and start

A control device for controlling automatic engine stop and start comprising a starter, a detection means, and at least two selected from a engine self-restart control means, a pre-gear synchronizing control means, a pre-gear meshing control means,

• wherein the starter comprised of a starter motor for rotating a pinion gear and an actuator capable of meshing the pinion gear with a ring gear which is fixed to a crank shaft of an internal combustion engine, and the starter independently drives the starter motor and the actuator, respectively, and the control device is capable of stopping the internal combustion engine when an automatic engine stop request is issued, and restarting the internal combustion engine when an engine restart request is issued,
• the engine self-restart control means executes an engine self-restart control of restarting the internal combustion engine by restarting a fuel injection without performing a cranking of the starter when the engine restart request is issued while a current rotation speed of the internal combustion engine is within a first rotation speed range which is higher than a first rotation speed and the rotation speed of the internal combustion engine is dropping due to the automatic engine stop,
• the pre-gear synchronizing control means executes a pre-gear synchronizing control of restarting the internal combustion engine by performing the cranking by the starter after driving the starter motor to synchronizing a rotation speed of the pinion gear with a rotation speed of the ring gear, and then driving the actuator to mesh the pinion gear with the ring gear when the engine restart request is issued while the current rotation speed of the internal combustion engine is within a second rotation speed range which is not more than the first rotation speed and higher than a second rotation speed and while the rotation speed of the internal combustion engine is dropping due to the automatic engine stop,
• the pre-gear meshing control means executes a pre-gear meshing control of restarting the internal combustion engine by performing the cranking of the starter in which the pre-gear meshing control means drives the starter motor to rotate the pinion gear after or during a gear meshing between the pinion gear and the ring gear when the engine restart request is issued while the current rotation speed of the internal combustion engine is within a third rotation speed range which is not more than the second rotation speed and while the rotation speed of the internal combustion engine is dropping due to the automatic engine stop, and
• the detection means detects a failure of the engine restart control performed by one of the engine self-restart control means, the pre-gear synchronizing control means, and the pre-gear meshing control means, and
• when the detection means detects the engine restart failure, the control device instructs the control means which causes the engine restart failure to prohibit the execution of its engine restart control until the rotation speed of the internal combustion engine is decreased to less than a predetermined threshold value after the detection time of the engine restart failure.

A control device for controlling automatic engine stop and start comprising a starter, a pre-set control means, and a detection means,

• wherein the starter comprises a starter motor for rotating a pinion gear and an actuator capable of meshing the pinion gear with a ring gear which is fixed to a crank shaft of an internal combustion engine, and the starter independently driving the starter motor and the actuator, respectively, and the control device is capable of stopping the internal combustion engine when an automatic engine stop request is issued, and restarts the internal combustion engine when an engine restart request is issued,
• the pre-set control means which executes a pre-set control which drives the electromagnetic actuator to mesh the pinion gear with the ring gear when the rotation speed of the internal combustion engine is decreased to a predetermined value which is close to zero before the engine restart request is issued while the rotation speed of the internal combustion engine is dropping due to the automatic engine stop, and
• the detection means detects a failure of the gear engagement between the pinion gear and the ring gear by the preset control,
• wherein when the detection means detects the engine restart failure, the control means drives the pre-set control means to execute the pre-set control during a time period counted form the detection time engine restart failure to the time when the rotation speed of the internal combustion engine reaches zero.