Apparatus and method for controlling rotational speed of internal combustion engine for vehicles

A method of controlling a rotational speed of an internal combustion engine coupled via a clutch to a transmission, said engine being equipped with exhaust brake means and fuel amount controlling means, said method comprising the steps of:

• (a) detecting a rotational speed of said engine;
• (b) detecting a gear changing state of said transmission;
• (c) deriving a vehicle speed from a rotational speed of an output shaft of said transmission;
• (d) detecting a gear ratio of said transmission;
• (e) computing a rotational speed of an input shaft of said transmission from said vehicle speed and said gear ratio;
• and
• (f) controlling said exhaust brake means and said fuel amount controlling means in accordance with said detected vehicle speed and said detected gear position on the basis of a detected gear changing state so that a detected rotational speed of said engine approaches a detected rotational speed of said input shaft of said transmission during said gear changing state.

An apparatus for controlling a rotational speed of an internal combustion engine coupled via a clutch with a transmission, comprising:

• (a) first means for detecting a rotational speed of said engine;
• (b) second means for detecting a connecting and disconnecting state of said clutch;
• (c) third means for determining a vehicle speed from a rotational speed of an output shaft of said transmission;
• (d) fourth means for detecting a gear position of said transmission;
• (e) fifth means for calculating a rotational speed of an input shaft of said transmission from the vehicle speed determined by said third means, and the gear position detected by said fourth means;
• (f) fuel amount controlling means for controlling an amount of fuel supplied to said engine to control the rotational speed of said engine;
• and
• (g) sixth means for detecting a gear changing state of said transmission on the basis of said clutch state detection by said second means, and for controlling said fuel amount controlling means in accordance with said vehicle speed determined by said fourth means and said gear position detected by said fifth means so that the rotational speed of said engine detected by said first means approaches the rotational speed of said input shaft of said transmission during said gear changing state.

A method of controlling a rotational speed of an internal combustion engine coupled via a clutch to a transmission, said engine being equipped with fuel amount controlling means, said method comprising the steps of:

• (a) detecting a rotational speed of said engine;
• engine;
• (b) detecting a gear changing state of said transmission;
• (c) determining a vehicle speed from a rotational speed of an output shaft of said transmission;
• (d) detecting a gear position of said transmission;
• (e) claculating a rotational speed of an input shaft of said transmission from the determined vehicle speed and gear position;
• and
• (f) controlling said fuel amount controlling means in accordance with a detected vehicle speed and a detected gear position on the basis of a detected gear changing state so that a detected rotational speed of said engine approaches a detected rotational speed of said input shaft of said transmission during said gear changing state.