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US20090241883: CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE SYSTEM, AND INTERNAL COMBUSTION ENGINE SYSTEM

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Filing Information

Inventor(s) Masahiro Nagoshi · Masayuki Tetsuno · Katsumasa Yoshida ·
Assignee(s) MAZDA MOTOR COPORATION ·
Correspondent Studebaker & Brackett PC ·
Application Number US12396068
Filing date 03/02/2009
Publication date 10/01/2009
Predicted expiration date 03/02/2029
U.S. Classifications 123/179.4  · 701/113  · 701/112  ·
International Classifications F02N1700  ·
Kind CodeA1
Foreign Priority JP2008088049 - 03/28/2008 · JP2008088050 - 03/28/2008 ·
20 Claims, 11 Drawings


Abstract

The invention relates to a control method for an internal combustion engine system, capable of preventing an internal combustion engine in a state after being automatically stopped, from falling into an unrestartable state. Upon satisfaction of a given automatic stop condition, the engine 10 being running is automatically stopped (Step 11). A value of current IEBAT flowing out of a starter battery 520 is compared with a given current value IEBAT—TH, in an automatically stopped state of the engine 10 (Step S30) to diagnosis a discharging status of the starter battery 520. If a result of the diagnosis indicates that the value of current IEBAT flowing out of the starter battery 520 is greater than the given current value IEBAT—TH, it is determined that a post-attached load is detected, and the engine 10 is restarted irrespective of the satisfaction or non-satisfaction of a given restart condition.

Independent Claims | See all claims (20)

  1. 1. A control method for an internal combustion engine system which includes an internal combustion engine, an electric drive unit adapted to start up the internal combustion engine, and a starter battery for use as an electric power source for activating the electric drive unit, the control method comprising: an automatic stop step of, upon satisfaction of a given automatic stop condition, automatically stopping the internal combustion engine being running; a restart step of, upon satisfaction of a given restart condition after the internal combustion engine is automatically stopped, supplying electric power from the starter battery to the electric drive unit to automatically restart the internal combustion engine; a post-attached load detection step of detecting the presence or absence of a post-attached load to be supplied with electric power from the starter battery, based on a discharging status of the starter battery in the automatically stopped state of the internal combustion engine; and a forcible restart step of, when the post-attached load is detected as a result of the post-attached load detection step, restarting the internal combustion engine irrespective of the satisfaction or non-satisfaction of the restart condition.
  2. 11. An internal combustion engine system comprising an internal combustion engine, an electric drive unit adapted to start up the internal combustion engine, a starter battery for use as an electric power source for activating the electric drive unit, and running control unit configured to govern a running control of the internal combustion engine, the running control unit including: automatic stop unit operable, upon satisfaction of a given automatic stop condition, to automatically stop the internal combustion engine being running; restart unit operable, upon satisfaction of a given restart condition after the internal combustion engine is automatically stopped, to allow electric power to be supplied from the starter battery to the electric drive unit so as to automatically restart the internal combustion engine; post-attached load detection unit operable to detect the presence or absence of a post-attached load to be supplied with electric power from the starter battery, based on a discharging status of the starter battery in the automatically stopped state of the internal combustion engine; and forcible restart unit operable, when the post-attached load is detected as a detection result of the post-attached load detection unit, to restart the internal combustion engine irrespective of the satisfaction or non-satisfaction of the restart condition.

References Cited

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Referenced By

Document NumberAssigneeInventorsIssue/Pub Date
US8498802 --
US8510019 --
US8504279 --
US8639424 --
US8818685 --
US8793034 --

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