Control system for non-linear control of a speed setting and a throttle valve in an aircraft engine

A control system for an aircraft engine comprising:

• a controllable pitch propeller connected to the aircraft engine;
• governor means for controlling a rotational speed of the propeller to a set speed by adjusting the pitch of the propeller;
• speed setting means for changing said set speed of the propeller governor;
• throttle means for changing a degree of opening of a throttle valve disposed on an intake air passage of the engine;
• control means for controlling said speed setting means and said throttle means, said control means including a single control lever, said control means controlling said speed setting means and said throttle means so that said set speed and the degree of opening of the throttle valve change simultaneously in accordance with a stroke of the single control lever;
• and
• wherein said control means controls at least one of said speed setting means and said throttle means in such a manner that the set speed and the degree of opening of the throttle valve change nonlinearly with respect to each other;
• and
• wherein said control means controls said speed setting means in such a manner that the rate of change of the set speed of the governor means is larger compared to the rate of change of the degree of opening of the throttle valve when the engine output power is within a predetermined low output power range and is smaller compared to the rate of change of the degree of opening of the throttle valve when the engine output power is within a predetermined high output power range.

A control system for an aircraft engine comprising:

• a controllable pitch propeller connected to the aircraft engine;
• governor means for controlling a rotational speed of the propeller to a set speed be adjusting the pitch of the propeller;
• speed setting means for changing said set speed of the propeller governor;
• throttle means for changing a degree of opening of a throttle valve disposed on an intake air passage of the engine;
• control means for controlling said speed setting means and said throttle means, said control means including a single control levers, said control means controlling said speed setting means and said throttle means so that said set speed and the degree of opening of the throttle valve change simultaneously in accordance with a stroke of the single control lever;
• and
• wherein said control means controls at least one of said speed setting means and said throttle means in such a manner that the set speed and the degree of opening of the throttle valve change nonlinearly with respect to each other;
• and
• said control system further comprising an air-fuel ratio switching means for switching an operating air-fuel ratio of the engine from a lean air-fuel ratio to a rich air-fuel ratio when the engine output power becomes larger than a predetermined value, and warning means for increasing a reaction force for operating said single control lever when the air-fuel ratio switching means switches the operating air-fuel ratio of the engine from said lean air-fuel ratio to said rich air-fuel ratio.