초록 ▼

A vehicle speed control system comprises a memory which stores a signal Vr representing desired road speed which is compared in a comparator with a signal Vs representing actual speed. An actuator responds to any error by adjusting the engine to bring the vehicle to the correct speed. Units are prov

A vehicle speed control system comprises a memory which stores a signal Vr representing desired road speed which is compared in a comparator with a signal Vs representing actual speed. An actuator responds to any error by adjusting the engine to bring the vehicle to the correct speed. Units are provided to enable the driver to increment or decrement the stored desired speed by small amounts (e.g. 0.5 miles per hour). By means of switches, he can switch into the memory either one of two preset desired speed values. He can also modify these present values, by feeding in, instead, the actual road speed of the vehicle, such modified preset values remaining until the engine is next switched off. The system incorporates a “SOFT OFF”feature, by which, under certain switch off modes of the system, the engine power is not shut off abruptly but at a controlled rate. The system is advantageously implemented by means of a microprocessor. The stored parameters can be arranged to be overwritten by alternative parameters stored in an EPROM.

대표청구항 ▼

A vehicle speed control system for controlling a vehicle to run at a selectable desired ground speed, comprising main memory means for storing a signal representing the desired speed. comparing means connected to the main memory means and to receive an actual speed signal representing the actual gro

A vehicle speed control system for controlling a vehicle to run at a selectable desired ground speed, comprising main memory means for storing a signal representing the desired speed. comparing means connected to the main memory means and to receive an actual speed signal representing the actual ground speed and operative to compare the actual speed signal with the value of the stored signal so as to produce an error signal dependent on any difference between the compared signals, output means responsive to the error signal for controlling the vehicle in dependence thereon so as to adjust its speed in a manner tending to reduce the error signal to zero, subsidiary memory means storing at least one preset signal representing a predetermined value of desired ground speed, driver-operable means connected to the subsidiary memory means and operative to feed this preset signal from the subsidiary memory means into the main memory means and storing it in the main memory means as the stored signal, and driver-operable adjusting means connected to the subsidiary memory means for providing a temporary change in the value for the preset signal stored therein.