Multistage automatic transmission

A multistage automatic transmission for use with an engine of a motor vehicle, comprising:

• a first clutch that is able to establish an odd speed of the transmission when engaged,
• a second clutch that is able to establish an even speed of the transmission when engaged;
• a first clutch actuator that adjusts an engaging force produced by the first clutch;
• a second clutch actuator that adjusts an engaging force produced by the second clutch;
• a throttle open degree sensor that detects an open degree of a throttle valve of the engine;
• and
• a control unit that issues instruction signals to the first and second clutch actuators upon processing information signals applied thereto,
• the control unit comprising:
• a first section that determines a desired speed of the transmission upon receiving the information signals;
• a second section that issues an instruction signal to at least one of the first and second clutch actuators to engage the corresponding one of the first and second clutches for establishing the desired speed;
• and
• a third section that issues an instruction signal to at least one of the first and second clutch actuators for applying a limitation to an engaging force produced by the corresponding one of the first and second clutches when the open degree of the throttle valve is smaller than a predetermined degree.

In a multistage automatic transmission for use with an engine of a motor vehicle, which comprises a first clutch that is able to establish an odd speed of the transmission when engaged, a second clutch that is able to establish an even speed of the transmission when engaged;

• a first clutch actuator that adjusts an engaging force produced by the first clutch;
• a second clutch actuator that adjusts an engaging force produced by the second clutch;
• and a throttle open degree sensor that detects an open degree of a throttle valve of the engine,
• a method for controlling the transmission comprising:
• determining a desired speed of the transmission upon receiving information signals;
• issuing an instruction signal to at least one of the first and second clutch actuators to engage the corresponding one of the first and second clutches for establishing the desired speed;
• and
• issuing an instruction signal to at least one of the first and second clutch actuators for applying a limitation to an engaging force produced by the corresponding one of the first and second clutches when the open degree of the throttle valve is smaller than a predetermined degree.