METHOD TO REDUCE FUEL CONSUMPTION WHEN DRIVING A VEHICLE AND SWITCHING TO HIGHER GEAR, A COMPUTER PROGRAM FOR THE METHOD, A SYSTEM ENABLING THE METHOD AND A VEHICLE FOR IT

摘要

A method to reduce fuel consumption when driving a vehicle, wherein the vehicle comprises an internal combustion engine, and a gearbox that is settable to a plurality of transmission ratios, and the vehicle is configured to be driven in at least a first mode (M1) and a second mode (M2), wherein, when the vehicle is driven according to the second mode (M2), a reduced fuel consumption is prioritized to a larger extent at the cost of performance compared with when the vehicle is driven according to the first mode (M1). When setting the gearbox from a first transmission ratio to a second transmission ratio lower than the first transmission ratio that is one of the three lowest settable transmission ratios for the gearbox, the method includes comparing a torque (Treq) requested from the internal combustion engine after setting the gearbox to the second transmission ratio with a first torque (Tlim1), and driving the vehicle according to the second mode (M2) if the request for torque (Treq) from the internal combustion engine is below the first torque (Tlim1).

主权项

1. A method to reduce fuel consumption when driving a vehicle, wherein the vehicle comprises an internal combustion engine, and a gearbox that is settable to a plurality of transmission ratios, and the vehicle is configured for being driven in at least a first mode (M1) and a second mode (M2), wherein, when the vehicle is driven according to the second mode (M2), a reduced fuel consumption is prioritized to a larger extent at the cost of performance compared with when the vehicle is driven according to the first mode (M1), the method comprising:
when setting the gearbox from a first transmission ratio to a second transmission ratio that is lower than a first transmission ratio and is one of three lowest settable transmission ratios for the gearbox, comparing a torque (Treq) requested from the internal combustion engine after setting the gearbox to the second transmission ratio with a first torque (Tlim1), and driving the vehicle according to the second mode (M2) if the request for torque (Treq) from the internal combustion engine is below the first torque (Tlim1).