| 摘要 |
Mechanical emergency override assembly for an electronic throttle valve assembly of the type having a servomotor to control the closure of the throttle valve flap in the range of from 0 DEG to about 4 DEG -15 DEG in accord with predetermined criteria. The mechanical emergency override improvement comprises dual stop assemblies, which in emergency operation are counteractive when disabled to provide a mechanical stop at about a 5 DEG opening and permit a snap linkage between the setting unit and throttle flap arm to be engaged for mechanical (gas pedal) operation throughout the full range of opening. The servo is spring linked to a second throttle flap arm and can disengage this mechanical override. Normal throttle wider opening, and emergency operation at angles from 5 DEG to full open, are controlled by the driver actuating the gas pedal, but the actual valve flap opening angle is microprocessor-controlled via the servo to be less than the pedal angle on a predetermined curve. A setting control unit is provided to permit a full range of idle control adjustments. The setting control unit also includes a first stop assembly for idle control and for cruise control setting. Desired value and actual throttle opening value transducer transmitters provide signals to a microprocessor which integrates the information into control of the servo and the stop assemblies. The microprocessor can also control the throttle based on additional inputs from engine operating conditions, load conditions, wheel spin, angle slip, and the like, to provide optimum engine operation and fuel economy, and permits operation of the mechanical override in an emergency.
|
