Electrically heated windscreen washing system for motor vehicle

摘要

The windscreen washing system has a self-contained electrical heating unit (5) inserted into the run of the washing fluid delivery pipes (4, 6). The heating arrangement comprises an insulated container (13) with a heat-reflective coating (14), containing a heating coil (47) supplied with electrical power from a battery (34) through cut-off relays (24, 25). At least one of the cut-off relays is connected to a heat sensor (55) in the fluid container, which turns the relay on if the fluid is too cold, to a safety relay (26) to prevent heating if the fluid volume is too low, and to a time lag relay (27) to break the circuit after a pre-set time. The fluid container has a large enough capacity for several washing operations.