Speed control apparatus and method for rapid transit vehicles
First Claim
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1. In speed control apparatus for a vehicle including a propulsion motor and reponsive to an input command speed, the combination of:
- means responsive to the input command speed for determining a desired operating state for said propulsion motor,means for determining a predetermined speed control band in relation to said command speed,means for determining a first time period in relation to said speed band and in accordance with the speed of the vehicle and the acceleration of the vehicle,means for determining a second time period in accordance with the operating characteristic of said motor and the mass of said vehicle, andmeans for comparing the first time period with the second time period to determine when a transition of the motor is made to said desired state.
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Abstract
There is disclosed a transit vehicle speed control apparatus and method operative to control the speed of the vehicle in relation to the lowest one of an input command speed limit and a program stop speed limit by determining the time period required for the vehicle speed to change from a present speed to a predetermined speed band limit in relation to each of the acceleration of the vehicle and the response delay time of the vehicle in accordance with the propulsion motor characteristics and the vehicle mass.
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Citations
10 Claims
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1. In speed control apparatus for a vehicle including a propulsion motor and reponsive to an input command speed, the combination of:
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means responsive to the input command speed for determining a desired operating state for said propulsion motor, means for determining a predetermined speed control band in relation to said command speed, means for determining a first time period in relation to said speed band and in accordance with the speed of the vehicle and the acceleration of the vehicle, means for determining a second time period in accordance with the operating characteristic of said motor and the mass of said vehicle, and means for comparing the first time period with the second time period to determine when a transition of the motor is made to said desired state. - View Dependent Claims (2, 3, 4, 5, 6)
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7. The method of speed control for a vehicle having a propulsion motor and a present speed and being responsive to a first command speed limit, including the steps of
determining desired speed band limits for said vehicle in response to the first command speed limit, determining a first time required for the vehicle speed to change from the present speed to a predetermined one of said speed band limits in relation to the acceleration of the vehicle, determining a second time required for the vehicle tractive effort to change from the present tractive effort to a desired tractive effort in relation to said one speed band limit, a known operational characteristic of said motor and the mass of the vehicle, and comparing the first time with the second time to control a change of the vehicle speed from the present speed to said one speed band limit.
Specification