Digital speed pattern generator

A speed pattern generator for providing a speed pattern signal which is changeable between zero and a predetermined maximum value within predetermined jerk and acceleration constraints comprising:

• acceleration means selectively incrementable and decrementable by a first predetermined binary increment,
• jerk means providing a first pulse train at a predetermined constant average rate, with said rate being indicative of the maximum rate at which said acceleration means should be changed when using said first binary increment,
• first control means enabling said acceleration means to be incremented by said first binary increment in response to the pulses of said first pulse train, when the speed pattern signal is to be provided, until the acceleration means reaches a predetermined binary count indicative of a predetermined acceleration,
• velocity means selectively incrementable and decrementable by a second predetermined binary increment,
• digital integrating means providing a second pulse train, said second pulse train having a controllable rate responsive to the count on said acceleration means, with the rate of said second pulse train being indicative of the rate at which said velocity means should be changed when using said second binary increment,
• and second control means enabling said velocity means to be incremented by said second binary increment in response to said second digital pulse train, until the velocity means reaches a predetermined value,
• said first control means being responsive to said velocity means, enabling said acceleration means to be decremented towards zero by the first binary increment in response to said first digital pulse train, when the velocity means reaches a predetermined binary count, to reduce the rate of change of the count on said velocity means as the predetermined value is approached.

A speed pattern generator for directing the movement of an elevator car from one floor of a building to another floor, comprising:

• means providing a first digital speed pattern signal which changes within predetermined maximum jerk and acceleration constraints,
• means providing a second digital speed pattern signal responsive to the slow-down distance from the elevator car to a floor at which it is to stop,
• and means slaving the first digital speed pattern signal to the second digital speed pattern signal,
• with said first digital speed pattern signal being used to direct the movement of said elevator car.

A speed pattern generator for directing the movement of an elevator car from one floor of a building to another floor, within predetermined maximum jerk and acceleration constraints, comprising:

• first means providing a first digital speed pattern signal for decelerating the elevator car,
• said first means including jerk means which provides a first pulse train at a predetermined constant average rate, acceleration means which has a binary count which is selectively incrementable and decrementable by said first pulse train, digital integrating means which provides a second pulse train at a rate proportional to the binary count on said acceleration means, and velocity means which has a binary count which is decrementable by said second pulse train,
• second means providing a second digital speed pattern signal responsive to the distance to go from the elevator car to the floor at which it is to stop,
• and control means responsive to the difference between said first and second digital speed pattern signals for incrementing said acceleration means responsive to said first pulse train when the count of said first digital speed pattern signal is less than the count of said second digital speed pattern signal, and for decrementing said acceleration means responsive to said first pulse train when the count of said first digital speed pattern signal is greater than the count of said second digital speed pattern signal.