US3565202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for electric vehicle drive
Assignee: Caterpillar Inc
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Filing: 1968-12-20
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Granted: 1971-02-23
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Expires: 1988-12-20
Abstract
Abstract To meet the special control problems arising in electric drive vehicle wherein a split shaft gas turbine engine drives a generator through its power turbine, a control system employs a closed loop to control the horsepower output of the engine proportional to a demand signal input and an independent, second closed loop to control the generator field excitation as a function of generator speed error.
Inventors
- 👤 Duane E Evans
- 👤 Daniel C Lenkaitis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:04
CPC Classifications
B; B60; B60L; B60L50/00; B60L50/10; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/70; Y02T10/7072
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
194 words
In a drive system with a gas turbine having a gasifier turbine and a separate power turbine driving a generator with a controllable field for providing electrical power for cyclic electrical loads, a control system comprising: a generator speed sensor means producing a speed signal proportional to actual generator speed; generator field control means having an independent closed loop system coupled to receive as inputs said speed signal from said generator speed sensor and a bias representing a selected speed input, said independent loop operable to control said controllable field solely as a function of generator speed; a demand signal generating device operable to produce a demand signal representing desired electrical power; a generator electrical power output sensor connected in the generator electrical power output circuits producing an output signal proportional to actual electrical power output; summing means connected to receive said demand signal and said output signal and operable to produce a difference signal representing their difference; a control unit connected to receive said difference signal and connected to the fuel control unit of said gas turbine engine whereby the rate of fuel flow is controlled as a function of said difference signal.
Claim 2
Dependent Claim
194 words
In a drive system with a gas turbine having a gasifier turbine and a separate power turbine driving a generator with a controllable field for providing electrical power for cyclic electrical loads, a control system comprising: a generator speed sensor means producing a speed signal proportional to actual generator speed; generator field control means having an independent closed loop system coupled to receive as inputs said speed signal from said generator speed sensor and a bias representing a selected speed input, said independent loop operable to control said controllable field solely as a function of generator speed; a demand signal generating device operable to produce a demand signal representing desired electrical power; a generator electrical power output sensor connected in the generator electrical power output circuits producing an output signal proportional to actual electrical power output; summing means connected to receive said demand signal and said output signal and operable to produce a difference signal representing their difference; a control unit connected to receive said difference signal and connected to the fuel control unit of said gas turbine engine whereby the rate of fuel flow is controlled as a function of said difference signal.
Claim 3
Dependent Claim
18 words
The control system as described in claim 1 wherein the fuel control unit includes an acceleration limiting Device.
Claim 4
Dependent Claim
27 words
The control system as described in claim 1 wherein the drive system is a vehicle drive wherein the generator powers electric motors driving wheels of said vehicle.
Claim 5
Dependent Claim
50 words
The control system as described in claim 3 wherein each electrical motor driving a driving wheel of the vehicle has a speed sensing transducer associated therewith in a protective circuit, said protective circuit connected to said summing means and operable to send a signal thereto when a wheel motor overspeeds.
Claim 6
Dependent Claim
67 words
The control system as defined in claim 4 wherein a current sensor means is included in the connection between the generator and of the electric motors driving a driving wheel of the vehicle, said current sensor connected in a protective circuit coupled to the control unit and operable to send a signal to reduce the rate of fuel flow any time the maximum permissible current is exceeded.
Claim 7
Dependent Claim
90 words
The control system as defined in claim 1 wherein the summing means receiving the demand signal and the output signal includes a high gain amplifier and its connection to the control unit includes a blocking diode which will pass a difference signal only when the said output signal is of larger magnitude than said demand signal and said control unit includes a bias of opposite polarity than a signal which will pass the diode whereby the bias will cause a maximum fuel signal until a signal passes through said diode.
Claim 8
Dependent Claim
49 words
The control system as described in claim 6 wherein the gasifier turbine has a speed transducer means associated therewith, said speed transducing means connected in a protective circuit coupled to the control unit to produce a signal to reduce the rate of fuel flow when said gasifier turbine overspeeds.
Claim 9
Dependent Claim
39 words
The control circuit as described in claim 1 wherein the demand signal generating device is coupled to the generator field control means and operable to change its selected speed input bias when said demand signal generating device is manipulated.
Claim 10
Dependent Claim
47 words
The control system as described in claim 8 wherein manipulation of the demand signal generating means to increase the demand signal decreases the bias on the generator field control means and allows some of the inertia in the generator drive to provide fast generator electrical output response.
Claim 11
Dependent Claim
47 words
The device as described in claim 8 wherein manipulation of said demand signal generating device to increase the demand signal increases the bias in the generator field control means thereby causing the generator electrical output to increase to the selected power output on the most efficient curves.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |