Method of determining the temperature of a cylinder head

摘要

The invention concerns determining the temperature of an inner section of a cylinder head 204 in an internal combustion engine which comprises at least one piston cylinder 201 which cylinder is formed at least in part by the cylinder head 204; and at least one jacket 205, the jacket having a proximal wall 207 (ie proximate to the piston cylinder) and a distal wall 211 (distal to the piston cylinder). The method comprises providing a temperature sensor 202 on the distal wall 211; receiving a first temperature measurement from the temperature sensor 202; and inferring the temperature of the inner section of the cylinder head 204 from the first temperature measurement. The temperature sensor 202 (cylinder head temperature (CHT) sensor) may be located on the uppermost outer surface of the coolant jacket. A variable coolant pump may be controlled according to the measured temperature. The control unit may also take account of vehicle speed, engine load and ambient temperature.