Method for control of engine torque during gear changing

US5595551A · kind A · utility

Assignee

• SCANIA CV · SE

Inventors

• Lars-Gunnar Hedstrom · Vagnhärad, SE
• Roger Andersson · Vallda, SE
• Goran Soderman · Nykvarn, SE
• Torbjorn Gustavsson · Nyköping, SE

Key dates

• Filing date: May 8, 1995
• Grant date: Jan 21, 1997
• Expiry date: May 8, 2015

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2063/506
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

The invention relates to an improved method for ensuring that at the time of disengagement of a gear in connection with changing gear in mechanical gearboxes without clutch disengagement the engine torque is adjusted to a zero-torque level which is continuously corrected on the basis of the instantaneous acceleration of the engine but also on the basis of the internal friction of the engine and on the basis of any power take-offs being powered by the engine. In gear changing, adjustment begins with a torque reduction at time t.sub.1. The torque is reduced to a zero-torque level M.sub.0 which is continuously variable during the reduction and which is adapted to the current engine deceleration and which is corrected by a friction factor M.sub.f and an acceleration factor M.sub.a. The friction factor M.sub.f is derived from a matrix M.sub.f (n,T) on the basis of current engine speed n and engine temperature T, and the acceleration factor M.sub.a is calculated continuously during the decrease (t1-t2) on the basis of the engine's moment of inertia and the instantaneous engine acceleration. The zero-torque level is also corrected on the basis of any power take-offs in operation, by means…