Patent ID: 9597951
Date: 2017-03-21
CPC Classifications: B60K,B60W,B60Y,F01P,F16H

Claim:
1. A cooling system for a heavy road vehicle comprising to hybrid propulsion system, the hybrid propulsion system comprising a first, mechanical propulsion system comprising a mechanical drive train including an internal combustion engine which provides a traction force to a first traction wheel via a gearbox, a second, hydraulic propulsion system comprising a hydraulic pump unit for powering a hydraulic motor ( wherein the hydraulic propulsion cooling circuit and the gearbox cooling circuit are connected in parallel, wherein a temperature dependent thermostat is positioned downstream the hydraulic cooling circuit, the temperature dependent thermostat being configured to increase the coolant flow through the gearbox cooling circuit relative the coolant flow through the hydraulic propulsion coolant circuit if a measured temperature of the coolant flow downstream the gearbox cooling circuit exceeds a predetermined threshold temperature, and wherein the coaling system further comprises a control unit configured to turn off the hydraulic propulsion system if a measured temperature of the hydraulic propulsion cooling circuit and the gearbox cooling circuit is above a predetermined temperature threshold limit.