Patent GB-1080809-A (GB)
Title: Apparatus for the remote electronic control of vehicle speeds
IPC: G08G1/0967
Filed: 1965-03-08
Abstract: 1,080,809. Inductive control of vehicle speed. S. W. DEANE. March 8, 1965 [March 17, 1964], No. 9701/65. Heading H4U. [Also in Division F1] Apparatus for controlling the speed of vehicles comprises a transmitter at a control station adjustable to transmit different frequencies, each frequency corresponding to a different speed, a receiver for the transmitted signals being mounted on a vehicle and operating a device to limit the speed of the vehicle to a value corresponding to the transmitted frequency. General arrangement. Figs. 1 and 2 (not shown).-As described the speed of road vehicles is controlled by means of a transmitter (10) connected to a loop (14) disposed longitudinally along a zone within which speed is to be controlled, provision being made for the control zone to be extended by connecting in further loops (14.1, 14.2) as required. The transmitter sends signals of a selected frequency within the range 1 to 6 kc/s., the corresponding speed being shown on a meter (88). The control signals are fed into the loop (14) via a tapped transformer, a meter (98) enabling the most suitable tap to be selected. The signal received by a pick-up coil (32) mounted on the vehicle is supplied to a receiver (38) a device (40) on the dashboard indicating that the vehicle is under speed control and the control speed being indicated by a pointer (44). At the same time an external light (46) lights up. A generator (50) controlled by the vehicle drive provides a current whose frequency is proportional to the vehicle speed which is compared at (38) with the received signal. When the resultant signal indicates that the vehicle speed is higher than the control speed a signal is sent to a device (54) which actuates the throttle through a lost-motion device to reduce the speed after which it is again under the control of the driver. This resultant signal also causes an external light 60 to flash and at the same time a lamp 42 inside the vehicle lights up. Receiver, Fig. 4.-The signal received by the pick-up coil 32 is amplified, squared and limited at 120, and the frequency is converted into a corresponding current at 128. This current is fed via lead 130 to an inverter 132. The A.C. output from a tacho-generator 50 is rectified at 138 and combined with the output from inverter 132, the difference signal switching on a transistor 144 if the vehicle speed is exceeding the permitted speed. Any output from transistor 144 is fed via amplifier 146 to a switching transistor 148 operating a relay 150, closure of relay contacts 152 supplying a control voltage to a solenoid device 54 operating on the throttle to control the engine, Figs. 5 to 7, or Figs. 8 to 10 (not shown). A flashing light 60 is also operated. The power supply is provided with a voltage stabilizer 180. When any signal is picked up by coil 32, circuit 182 actuates a relay 184 to close contacts 162 to complete the circuit for device 54 thus ensuring that the throttle control operates normally when the vehicle is not under speed control. Closure of contacts 162 lights a lamp 46. An indicator 40 receives an input from point 194 to show the speed limit set up for that zone.