ELECTRONIC CONTROL DEVICE FOR AUTOMATIC POWER TRANSMISSION MECHANISM

摘要

An electronic control device for an automatic power transmission mechanism that serves to effect smooth down shift by setting a neutral interval in accordance with vehicle speed and engine torque. In the control device, a first sensor electronically detects the vehicle speed and a second sensor detects the engine torque. A speed range indicating circuit receives output signals of the first and second sensors to generate a plurality of signals each indicating that the vehicle is running at a particular speed associated with the signal. A neutral interval adjustment circuit is provided to respond to the outputs of the first and second sensors and the plurality of speed range indicating signals so as to generate a pulse the width of which is equal to a proper neutral interval at the particular vehicle speed and engine torque. A command circuit is also provided to operate to hold the automatic power transmission mechanism in a neutral position for the duration of the pulse.