The torque calculation device and the torque calculation methodological null on vehicle

摘要

PROBLEM TO BE SOLVED: To calculate torque with high estimating accuracy by considering the flow amount of refrigerant flowing in an evaporator of a refrigerating cycle, without the need for attaching another new sensor other than existing sensors normally installed in a vehicular air-conditioner.;SOLUTION: A variable capacity compressor is provided in the refrigerating cycle of the vehicular air-conditioner. It uses an external control pulse signal for controlling the discharge capacity of the refrigerant and approximately specifying compressor suction side pressure from the control pulse signal and compressor discharge side pressure. The torque is calculated in accordance with before-behind evaporator temperature difference data Δt for a temperature difference between an air temperature on the inlet side of the evaporator and an air temperature on the outlet side of the evaporator, compressor discharge side pressure data Pd, duty ratio data for the control pulse signal and compressor rotating speed data.;COPYRIGHT: (C)2006,JPO&NCIPI