Controller for a power train
First Claim
Patent Images
1. A controller for a power train which includes a prime mover, a first electrical machine mechanically connected to the prime mover, a second electrical machine electrically connected to the first electrical machine by a voltage bus, and dissipation means connected to the voltage bus for dissipating electrical power, the controller comprising:
- means for providing a speed signal indicative of a speed of the prime mover; and
first control means responsive to the speed signal to divert power generated by either the first or second electrical machine from the bus to the dissipation means in which the first control means is enable by the speed signal to maintain the bus votage substantially at a desired level by diverting power from the bus to the dissipation means in both motoring or braking modes of the second electrical machine.
2 Assignments
0 Petitions
Accused Products
Abstract
A power train controller can operate in either motoring or braking modes. Its prime mover accepts a limited proportion of braking power and the remainder of the braking power is dissipated in an energy dump. A control system is arranged to maintain the voltage bus of the power train at a constant value throughout both modes.
-
Citations
15 Claims
-
1. A controller for a power train which includes a prime mover, a first electrical machine mechanically connected to the prime mover, a second electrical machine electrically connected to the first electrical machine by a voltage bus, and dissipation means connected to the voltage bus for dissipating electrical power, the controller comprising:
-
means for providing a speed signal indicative of a speed of the prime mover; and first control means responsive to the speed signal to divert power generated by either the first or second electrical machine from the bus to the dissipation means in which the first control means is enable by the speed signal to maintain the bus votage substantially at a desired level by diverting power from the bus to the dissipation means in both motoring or braking modes of the second electrical machine. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method of controlling a power train which includes a prime mover, a first electrical machine mechanically connected to the prime mover, a second electrical machine electrically connected to the first electrical machine by a voltage bus, and dissipation means connected to the voltage bus for dissipating electrical power, the method comprising:
-
providing a speed signal indicative of a speed of the prime mover; and diverting power generated by either the first or second electrical machine from the bus to the dissipation means in response to the speed signal including enabling maintenance of bus voltage substantially at a desired level in accordance with the speed signal by diverting power from the bus to the dissipation means in motoring or braking modes of the second electrical machine. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A power train system comprising a prime mover operable to provide and absorb mechanical power, a voltage bus, a first electrical machine operable as a generator to generate electrical power onto the voltage bus from the power delivered by the prime mover, and as a motor to deliver mechanical power absorbed by the prime mover;
- at least one second electrical machine connected to the voltage bus and operable to be driven by the electrical power generated by the first electrical machine and as a generator to deliver electrical power onto the voltage bus to drive the first electrical machine;
dissipation means for dissipating electrical power from the voltage bus;
means for providing a speed signal indicative of the speed of the prime mover; and
a controller responsive to the speed signal and the voltage on the bus to divert power from the bus to the dissipation means to maintain the bus voltage at a substantially constant level.
- at least one second electrical machine connected to the voltage bus and operable to be driven by the electrical power generated by the first electrical machine and as a generator to deliver electrical power onto the voltage bus to drive the first electrical machine;
Specification