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An automotive powertrain control system using only one signal of the output shaft speed sensor has been investigated in order to lower the system costs and to simplify the calibration process A new smooth torque method after downshifting is described which is based on the differential value of automatic transmission output shaft speed The starting time of the engine torque control for restraining the torque fluctuation after downshifting can be detected accurately as a result of using the differential value The proposed engine torque control method is advantageous since it simplifies the calibration process for the data tables Moreover, it is possible to lower the cost of parts used in the automatic transmission control since speed and torque sensors are unnecessary The smooth torque control method was examined using a test vehicle and the same smooth torque after downshifting was obtained when the new method was employed

Most automatic transmissions are controlled in compliance with a predetermined program. Transient control during gear shift is also carried out according to a predetermined process. In this method a lot of labor is required to tune data tables. So we developed a tuning free system by feedback control using torque estimation technology and the experimental result is reported. Torque fluctuation during shift is detected and fed back to compare the torque reference, which is generated from the estimated torque itself. The engine torque is decreased by means of retarding the ignition spark advance, according to the comparison deviation. As a consequence of the feedback, the transient torque control is carried out without any tuning trouble, and better than usual torque fluctuation is obtained.

Magnetic Phase Shifter is the controlling element to make integral action, excellent in anti-noise performance and makes high stable and reliable controlling device. (1)* We have developed a new compact thyristor chopper equipment controlled by Magnetic Phase Shifter. This equipment has simple controlling circuit and many functions such as wide range duty factor control, adjustable plugging brake, speed up by field weakening, anti-rollback control and so on.