Electricity: motive power systems – Battery-fed motor systems
Patent
1995-07-07
1997-02-04
Martin, David S.
Electricity: motive power systems
Battery-fed motor systems
318432, 318434, H02P 729
Patent
active
056002157
ABSTRACT:
The invention provides an electric vehicle controller in which the generated motor torque is limited when the voltage of the vehicle battery decreases during running, in order to suppress over-discharge of the battery. A high torque can be obtained for a short period, however, even in the torque limiting period, and over-discharge is prevented by stopping electric power converting means in a final stage of discharge voltage of the battery. According to the invention, during operation of the vehicle, the battery terminal voltage is monitored and compared with a first comparison value V.sub.1. If the battery voltage falls below V.sub.1, a first counter commences measurement of the time period during which this condition continues. If the time period measured by the first counter reaches a preset value t.sub.1, torque limitation is initiated. In the torque limitation state, a torque command signal, generated by the control to operate the vehicle motor, is compared with the signal generated by the vehicle accelerator, and the signal having the lower value is thereafter used to control operation of the vehicle motor. In order to provide the capability to generate higher levels of torque for brief periods during torque limitation, the torque limitation process is terminated if the accelerator pedal is released completely.
REFERENCES:
patent: 4590413 (1986-05-01), Gritter et al.
patent: 5193067 (1993-03-01), Sato et al.
patent: 5265022 (1993-11-01), Chonan et al.
patent: 5281900 (1994-01-01), Park
patent: 5343137 (1994-08-01), Kitaoka et al.
patent: 5384522 (1995-01-01), Toriyama et al.
patent: 5412323 (1995-05-01), Kato et al.
Naito Shotaro
Obara Sanshiro
Yamada Hiroyuki
Hitachi , Ltd.
Hitachi Automotive Engineering Co. Ltd.
Martin David S.
LandOfFree
Controller for electric vehicle does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Controller for electric vehicle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Controller for electric vehicle will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-682202