초록 ▼

The object of this invention is to reduce shift shocks by controlling the driving torque during gear shift changing so that the driving torque is represented by a smooth, ideal waveform. The driving torque calculating means estimates the output shaft torque of the automatic transmission from the eng

The object of this invention is to reduce shift shocks by controlling the driving torque during gear shift changing so that the driving torque is represented by a smooth, ideal waveform. The driving torque calculating means estimates the output shaft torque of the automatic transmission from the engine torque characteristic or torque converter characteristic and, based on the estimated driving torque, generate a targeted torque pattern during gear shift changing. The engine torque control value calculating means calculates the control value for controlling the engine output torque, i.e., an ignition timing correction value .DELTA..theta.ig, so as to eliminate the deviation between the targeted torque and the driving torque estimated by the driving torque calculating means. This ignition timing correction approximates the driving torque to smooth the targeted torque.

대표청구항 ▼

[ What is claimed is:] [1.] A powertrain control device for a vehicle comprising:an automatic transmission having a torque converter;a control device incorporating at least one microcomputer to control the engine and the automatic transmission;a driving torque calculating means for estimating the ou

[ What is claimed is:] [1.] A powertrain control device for a vehicle comprising:an automatic transmission having a torque converter;a control device incorporating at least one microcomputer to control the engine and the automatic transmission;a driving torque calculating means for estimating the output shaft torque of the automatic transmission;a targeted torque generating means for generating a targeted torque based on the driving torque estimated by the driving torque calculating means;an engine torque control value calculating means for calculating a control value for controlling the output torque of the engine from the deviation between the targeted torque generated by the targeted torque generating means and the driving torque estimated by the driving torque calculating means;an engine torque control value limiting means provided in the engine torque control value calculating means, for limiting the engine torque control value below a specified value;an engine torque control means for controlling the output torque of the engine in response to a signal from the engine torque control value calculating means;an estimated driving torque monitoring means for monitoring the magnitude of the estimated driving torque calculated by the driving torque calculating means; anda line pressure control device for controlling a line pressure of the automatic transmission by use of the estimated driving torque monitoring means.