Control system and method for the transmission of a vehicle

摘要

A control system for the transmission of an agricultural vehicle or an industrial off-highway vehicle, wherein the system comprises a controller of the clutch, connected thereto to supply an operating signal, a plurality of sensors suitable for measuring a plurality of characteristic quantities of the transmission and connected to the controller to supply a plurality of signals proportional to the quantities, a torque processor suitable for calculating a reference torque and connected to the controller to supply thereto a signal proportional to the reference torque, and a thermal load managing device suitable for receiving at least some of the plurality of quantities and for receiving the reference torque in order to calculate at least one operative datum on which the thermal power exchanged in the clutch is dependent. The control system is suited to process the operative datum to operate the transmission so as to limit the temperature in the clutch.

主权项

1. A control system for a transmission of an agricultural vehicle or an industrial off-highway vehicle, the agricultural or industrial off-highway vehicle including at least one clutch, the control system comprising:
a controller of the at least one clutch, connected thereto to supply a reference signal for operating the at least one clutch, a plurality of sensors for measuring a plurality of characteristic quantities of the transmission and connected at least to the controller to supply a plurality of signals proportional to the characteristic quantities, the characteristic quantities comprising quantities proportional to a power dissipated by the at least one clutch in slipping conditions and quantities proportional to a power carried off by a flow of a lubricating liquid of the at least one clutch, a torque processor for calculating a reference torque and connected to the controller to supply to the controller a signal proportional to the reference torque, a thermal load managing device for receiving at least some of the plurality of characteristic quantities and for receiving the reference torque in order to calculate at least one operative datum on which a thermal power exchanged in the at least one clutch is dependent, wherein the control system is suitable for processing the operative datum in order to operate the transmission so as to limit a temperature in the at least one clutch by modifying an energy balance between the power dissipated by the at least one clutch and the power carried off by the flow of the lubricating liquid by a reduction in the power dissipated by the at least one clutch and/or an increase in the power carried off by the flow of the lubricating liquid, wherein the thermal load managing device calculates a lubricating liquid flow rate in a hydraulic lubrication circuit of the at least one clutch as a function comprising the thermal power dissipated by the at least one clutch and the thermal conductance of the flow of the lubricating liquid, the thermal load managing device is connected to a power signal generating device to supply a signal proportional to the lubricating liquid flow rate, the power signal generating device is active on the hydraulic lubrication circuit to set the lubricating liquid flow rate.