Speed Controller for Vehicles

A method of controlling speed of a vehicle traveling on a road surface;

• said method comprising:
• a. inputting a maximum required retardive torque for deceleration of said vehicle into at least one controller;
• b. inputting a maximum allowable vehicle speed limit value for said vehicle into the at least one controller;
• and concurrently:
• c. determining if a throttle or accelerator of said vehicle is engaged;
• d. wherein whenever said throttle or accelerator of said vehicle is engaged, set a current vehicle speed limit value to said maximum allowable vehicle speed limit value of step b;
• e. wherein whenever said throttle or accelerator of said vehicle is not engaged, said at least one controller records a current vehicle speed value at time of throttle or accelerator release and sets the recorded current vehicle speed value at time of throttle or accelerator release as a current vehicle speed limit value;
• f. wherein steps c-e are continuously carried out throughout operation of said vehicle;
• g. concurrently determining whenever at least one brake of said vehicle is engaged;
• h. wherein whenever said at least one brake of said vehicle is engaged the current vehicle speed limit value of step e is not changed;
• i. wherein whenever said at least one brake of said vehicle is not engaged, determining and recording a current vehicle speed value at time of disengaging said at least one brake of said vehicle and setting the recorded current vehicle speed value at the time of disengaging said at least one brake of said vehicle as a new current vehicle speed limit value;
• j. wherein steps g-i are continuously carried out throughout operation of said vehicle;
• k. actively compare current vehicle speed value to current vehicle speed limit value;
• l. wherein whenever said current vehicle speed value is greater than said current vehicle speed limit value, engaging a PID loop logic controller to determine a correction value for vehicle speed value required to set a retardive braking value greater than zero in order to maintain current vehicle speed value equal to or below said current vehicle speed limit value;
• m. wherein whenever said current vehicle speed value is less than said current vehicle speed limit value, set said retardive braking value as zero;
• n. wherein steps k-m are continuously carried out throughout operation of said vehicle;
• and
• o. wherein steps c-m are concurrently and continuously carried out throughout operation of said vehicle.