US5296785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fail-safe vehicle suspension system including switched reluctance motor
Assignee: Ford Global Technologies LLC
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Filing: 1993-08-25
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Granted: 1994-03-22
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Expires: 2013-08-25
Abstract
Abstract The oscillatory spring movements of each wheel of a motor vehicle suspension system are damped by a switched reluctance machine which is actively controlled during standard suspension operation to define damping characteristics of the suspension or passively controlled to define a fail-safe damping rate in the event of failure within the system. The switched reluctance machines of a suspension system are selectively connected to standard control circuitry or fault control circuitry by relay contacts. Upon failure within the system, phases of the switched reluctance machines are charged via monopulsers which are controlled in response to rotational positions of the machines such that the machines operate as generators and withdraw energy from the suspension system and pass it to a parallel connected resistor and capacitor. Power for charging the phases of the switched reluctance machines is provided either from the capacitor or a power supply which is separately fused from the supply for the standard control circuitry. To ensure recognition of a failure and correction by an operator of a motor vehicle, preferably not all phases of a switched reluctance machine are operated in the fail-safe mode.
Inventors
- 👤 John M. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:03
CPC Classifications
H; H02; H02K; H02K16/00; H02K16/04; B; B60; B60G; B60G17/00; B60G17/015; B60G17/0152; B60G17/0157; H02K7/00; H02K7/06; B60G2202/00; B60G2202/40; B60G2202/42; B60G2202/422; B60G2600/00; B60G2600/60; B60G2600/602
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
176 words
A fail-safe suspension system for a motor vehicle having sprung and unsprung masses comprising: a switched reluctance rotary machine including a rotor and a stator; a ball screw and nut apparatus connecting the sprung and unsprung masses and rotating with said machine in alternate rotary directions as the sprung and unsprung masses move relative to one another; sensor means connected to said machine for sensing rotational positioning of said rotor of said machine; first controller means connected to said machine and said sensor means for providing standard operating excitation current to actively control said machine and thereby said suspension system; and second controller means connected to said machine and said sensor means for providing fail-safe excitation current to passively control said machine in the event of failure of said suspension system and thereby define a fail-safe damping rate for said suspension system, said stator of said switched reluctance rotary machine including at least one standard control winding connected to said first controller means and at least one fail-safe control winding connected to said second controller means.
Claim 2
Dependent Claim
176 words
A fail-safe suspension system for a motor vehicle having sprung and unsprung masses comprising: a switched reluctance rotary machine including a rotor and a stator; a ball screw and nut apparatus connecting the sprung and unsprung masses and rotating with said machine in alternate rotary directions as the sprung and unsprung masses move relative to one another; sensor means connected to said machine for sensing rotational positioning of said rotor of said machine; first controller means connected to said machine and said sensor means for providing standard operating excitation current to actively control said machine and thereby said suspension system; and second controller means connected to said machine and said sensor means for providing fail-safe excitation current to passively control said machine in the event of failure of said suspension system and thereby define a fail-safe damping rate for said suspension system, said stator of said switched reluctance rotary machine including at least one standard control winding connected to said first controller means and at least one fail-safe control winding connected to said second controller means.
Claim 3
Dependent Claim
59 words
A fail-safe suspension system for a motor vehicle having sprung and unsprung masses as claimed in claim 1 wherein said second controller means comprises: damping means for defining the fail-safe damping rate for said suspension system; and said fail-safe suspension system further comprises switch means for selectively activating one of said first controller means and said second controller means.
Claim 4
Dependent Claim
34 words
A fail-safe suspension system for a motor vehicle having sprung and unsprung masses as claimed in claim 2 wherein said damping means comprises a capacitor and a resistor connected in parallel with one another.
Claim 5
Dependent Claim
198 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses comprising: a switched reluctance rotary machine including a rotor and a stator, said machine being operable in a motoring mode and in a generating mode; a ball screw and nut apparatus connecting the sprung and unsprung masses and rotating with said machine in alternate rotary directions as the sprung and unsprung masses move relative to one another; rotational sensor means for generating a signal indicative of the rotational position of said rotor of said machine; first controller means connected to said machine and said rotational sensor means for providing standard operating excitation current to control said suspension system in said motoring and generating modes; and second controller means connected to said machine and said rotational sensor means for providing, in the event of failure of said first controller means, a fail-safe excitation current to said machine to operate said machine in said generating mode and thereby define a fail-safe damping rate for said suspension system, said stator of said machine including at least one first winding connected to said first controller means and at least one second winding connected to said second controller means.
Claim 6
Dependent Claim
198 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses comprising: a switched reluctance rotary machine including a rotor and a stator, said machine being operable in a motoring mode and in a generating mode; a ball screw and nut apparatus connecting the sprung and unsprung masses and rotating with said machine in alternate rotary directions as the sprung and unsprung masses move relative to one another; rotational sensor means for generating a signal indicative of the rotational position of said rotor of said machine; first controller means connected to said machine and said rotational sensor means for providing standard operating excitation current to control said suspension system in said motoring and generating modes; and second controller means connected to said machine and said rotational sensor means for providing, in the event of failure of said first controller means, a fail-safe excitation current to said machine to operate said machine in said generating mode and thereby define a fail-safe damping rate for said suspension system, said stator of said machine including at least one first winding connected to said first controller means and at least one second winding connected to said second controller means.
Claim 7
Dependent Claim
59 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses as claimed in claim 4 wherein said second controller means comprises: damping means for providing said fail-safe damping rate for said suspension system; and current control means for controlling current flow through said at least one second winding during fail-safe operation of said suspension system.
Claim 8
Dependent Claim
29 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses as claimed in claim 5 wherein said damping means comprises a capacitor and a resistor.
Claim 9
Dependent Claim
65 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses as claimed in claim 5 wherein said current control means comprises: switch means for connecting said damping means to said machine; and circuit means connected to said rotational sensor means for controlling said switch means based on said rotational position of said rotor of said machine to control said suspension system.
Claim 10
Dependent Claim
64 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses as claimed in claim 7 further comprising current sensing means for sensing current flow through said damping means and wherein said circuit means is connected to said current sensing means and further provides for limiting current flow through said damping means in response to current flow through said damping means.
Claim 11
Dependent Claim
36 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses as claimed in claim 8 wherein said circuit means comprises pulse width modulation means for limiting current flow through said damping means.
Claim 12
Dependent Claim
27 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses as claimed in claim 7 wherein said switch means comprises field effect transistors.
Claim 13
Dependent Claim
65 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses as claimed in claim 4 wherein said stator of said machine includes a plurality of first windings connected to said first controller means and a like plurality of second windings connected to said second controller means, said pluralities of first and second windings defining a plurality of phases of said machine.
Claim 14
Dependent Claim
78 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses as claimed in claim 11 wherein said fail-safe excitation current provided by said second controller means is provided to less than all of said plurality of phases of said machine such that operation of said suspension is substantially different from the standard control provided by said first controller to thereby indicate to an operator of said motor vehicle failure of said first controller means.
Claim 15
Dependent Claim
181 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses comprising: a multiple phase switched reluctance rotary machine including a rotor and a stator; a ball screw and nut apparatus connecting the sprung and unsprung masses and rotating with said machine in alternate rotary directions as the sprung and unsprung masses move relative to one another; sensor means for sensing angular position of said rotor of said machine; first controller means connected to said machine and said sensor means for providing standard operating excitation current to actively control said suspension system; and second controller means connected to said machine and said sensor means for providing fail-safe excitation current to passively control said suspension system in the event of failure of said first controller means, said second controller means providing fail-safe excitation current to less than all of said phases of said machine such that operation of said suspension is substantially different from the standard control provided by said first controller to thereby indicate to an operator of said motor vehicle the failure of said first controller means.
Claim 16
Dependent Claim
181 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses comprising: a multiple phase switched reluctance rotary machine including a rotor and a stator; a ball screw and nut apparatus connecting the sprung and unsprung masses and rotating with said machine in alternate rotary directions as the sprung and unsprung masses move relative to one another; sensor means for sensing angular position of said rotor of said machine; first controller means connected to said machine and said sensor means for providing standard operating excitation current to actively control said suspension system; and second controller means connected to said machine and said sensor means for providing fail-safe excitation current to passively control said suspension system in the event of failure of said first controller means, said second controller means providing fail-safe excitation current to less than all of said phases of said machine such that operation of said suspension is substantially different from the standard control provided by said first controller to thereby indicate to an operator of said motor vehicle the failure of said first controller means.
Claim 17
Dependent Claim
180 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses comprising: a multiple phase switched reluctance rotary machine including a rotor and a stator; a ball screw and nut apparatus connecting the sprung and unsprung masses and rotating with said machine in alternate rotary directions as the sprung and unsprung masses move relative to one another; sensor means for sensing angular position of said rotor of said machine; first controller means connected to said machine and said sensor means for standardly controlling said suspension system; and second controller means connected to said machine and said sensor means for controlling said suspension system in the event of failure of said first controller means, said second controller means operating less than all of said phases of said machine to indicate to an operator of said motor vehicle the failure of said first controller means, said stator of said machine including a plurality of first windings defining said multiple phases and connected to said first controller means, and at least one second winding connected to said second controller means.
Claim 18
Dependent Claim
180 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses comprising: a multiple phase switched reluctance rotary machine including a rotor and a stator; a ball screw and nut apparatus connecting the sprung and unsprung masses and rotating with said machine in alternate rotary directions as the sprung and unsprung masses move relative to one another; sensor means for sensing angular position of said rotor of said machine; first controller means connected to said machine and said sensor means for standardly controlling said suspension system; and second controller means connected to said machine and said sensor means for controlling said suspension system in the event of failure of said first controller means, said second controller means operating less than all of said phases of said machine to indicate to an operator of said motor vehicle the failure of said first controller means, said stator of said machine including a plurality of first windings defining said multiple phases and connected to said first controller means, and at least one second winding connected to said second controller means.
Claim 19
Dependent Claim
80 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses as claimed in claim 13 wherein said second controller means comprises: damping means for controlling the damping rate of said machine, said damping means including power storage means for storing power generated by said machine such that stored power can be applied to said machine; and control means for connecting said damping means to said machine in the event of failure of said first controller means.
Claim 20
Dependent Claim
63 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses as claimed in claim 15 wherein said control means comprises: switch means for connecting said damping means to said machine; and circuit means connected to said sensor means for controlling said switch means based on said rotational position of said rotor of said machine to control said suspension system.
Claim 21
Dependent Claim
64 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses as claimed in claim 16 further comprising current sensing means for sensing current flow through said damping means and wherein said circuit means is connected to said current sensing means and further provides for limiting current flow through said damping means in response to current flow through said damping means.
Claim 22
Dependent Claim
36 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses as claimed in claim 17 wherein said circuit means comprises pulse width modulation means for limiting current flow through said damping means.
Claim 23
Dependent Claim
27 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses as claimed in claim 16 wherein said switch means comprises field effect transistors.
Claim 24
Dependent Claim
29 words
A fail-safe damping suspension system for a motor vehicle having sprung and unsprung masses as claimed in claim 15 wherein said damping means comprises a resistor and a capacitor.
References Cited (Backward Citations)
US3934183A
Cited
US3638093A
Cited
US3921746A
Cited
US3861487A
Cited
US3970160A
Cited
US3981204A
Cited
US4032829A
Cited
FR2493059A1
Cited
US4434389A
Cited
US4620619A
Cited
US4526401A
Cited
US4684867A
Cited
DE3522221A1
Cited
US4729459A
Cited
US4666180A
Cited
US4740738A
Cited
US4846317A
Cited
JPH01164201A
Cited
US4815575A
Cited
US4912343A
Cited
US5027048A
Cited
US4896089A
Cited
JPH02273051A
Cited
US4969662A
Cited
US4968921A
Cited
US5028073A
Cited
US5070284A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-21 | 1997-09-20 | 1998-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-21 | 2001-09-20 | 2002-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-21 | 2005-09-20 | 2006-03-22 | $7700.00 | Window Closed / Lapsed |