US4915328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control method of electric vehicle
Assignee: Mitsubishi Electric Corp
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Filing: 1989-01-31
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Granted: 1990-04-10
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Expires: 2009-01-31
Abstract
Abstract A control method of an electric vehicle in which a frictional contact of rotating or stationary wheels of the electric vehicle to a rail road is recovered again when the wheels are in a slipping condition which is determined by a variable concerning rotation of the wheels exceeding a detection level which is determined by a sum of an instructed vehicle acceleration and a gradient acceleration determined by an inclination of the rail road.
Inventors
- 👤 Noriaki Nakamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:07
CPC Classifications
B; B60; B60L; B60L3/00; B60L3/10; B60L2200/00; B60L2200/26; B60L2220/00; B60L2220/10; B60L2220/12; B60L2240/00; B60L2240/60; B60L2240/64; B60L2240/642; B60W; B60W2552/00; B60W2552/15; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/72; Y02T90/00; Y02T90/10; Y02T90/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
A control method for an electric vehicle having wheels and frictional contact with rails, comprising the steps of: sensing the rotation of the wheels; producing a variable related to the sensed rotation of the wheels; comparing said variable to a detection level; determining the existence of a slip condition if said variable exceeds said level; and changing said detection level in accordance with the sum of the vehicle acceleration due to the rotation of driving motors and the vehicle acceleration due to the slope of the rails.
Claim 2
Dependent Claim
87 words
A control method for an electric vehicle having wheels and frictional contact with rails, comprising the steps of: sensing the rotation of the wheels; producing a variable related to the sensed rotation of the wheels; comparing said variable to a detection level; determining the existence of a slip condition if said variable exceeds said level; and changing said detection level in accordance with the sum of the vehicle acceleration due to the rotation of driving motors and the vehicle acceleration due to the slope of the rails.
Claim 3
Dependent Claim
21 words
The control method as claimed in claim 1, wherein the acceleration due to the slope is provided as previously stored information.
Claim 4
Dependent Claim
22 words
The control method as claimed in claim 1, wherein the acceleration due to the slope is sensed by a slope measuring means.
Claim 5
Dependent Claim
25 words
The control method as claimed in any of claims 1 to 3, wherein said variable is a time differentiation of rotation frequency of said wheels.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-09 | 1993-10-09 | 1994-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-09 | 1997-10-09 | 1998-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-09 | 2001-10-09 | 2002-04-10 | $7700.00 | Window Closed / Lapsed |