Control for an electromagnetic brake for a multiple-ratio power transmission that has a neutral switch for power take-off engagement
First Claim
1. A control system for an electromagnetic clutch brake for a power input shaft of a power transmission mechanism, the control system comprising:
- a clutch brake system controller having a protective circuit that monitors a clutch brake switch, an engine speed signal, and a vehicle speed signal that normally prevents engagement of the clutch brake unless the vehicle speed is below a predetermined level; and
a transmission neutral switch incorporated into the clutch brake system controller bypasses monitoring the vehicle speed signal when the transmission neutral switch is actuated.
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Accused Products
Abstract
A control system and method is disclosed for an electromagnetic clutch brake, including an electromagnetic clutch brake actuator coil surrounding a power input shaft for a multiple-ratio transmission in a vehicle powertrain. A protective circuit of the control system normally monitors data inputs that indicate conditions that are not favorable for clutch brake actuation. The protective circuit prevents actuation of the clutch brake under such conditions. The protective circuit may monitor a plurality of signals including a vehicle speed signal which prevents engagement of the clutch brake unless the vehicle speed is below a predetermined level. The system may further include a transmission neutral switch that permits bypassing monitoring the vehicle speed signal when the transmission neutral switch is actuated.
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Citations
14 Claims
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1. A control system for an electromagnetic clutch brake for a power input shaft of a power transmission mechanism, the control system comprising:
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a clutch brake system controller having a protective circuit that monitors a clutch brake switch, an engine speed signal, and a vehicle speed signal that normally prevents engagement of the clutch brake unless the vehicle speed is below a predetermined level; and a transmission neutral switch incorporated into the clutch brake system controller bypasses monitoring the vehicle speed signal when the transmission neutral switch is actuated. - View Dependent Claims (2, 3, 4, 5)
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6. An electromagnetic clutch brake for a vehicle powertrain for a wheeled vehicle, the powertrain comprising an engine, a multiple-ratio power transmission having a housing enclosing multiple-ratio gear elements, a power output shaft driveably connected to vehicle traction wheels, a power input shaft driveably connected to the multiple-ratio gear elements and a master clutch selectively connecting the power input shaft to the engine, the master clutch being enclosed by a master clutch housing forming a part of the transmission housing, the electromagnetic brake comprising:
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a stator coil housing secured to the transmission housing, the stator coil housing enclosing a stator coil surrounding the power input shaft and defining with the coil housing an electromagnetic pole face; a stator coil circuit including a voltage source and a switch for opening and closing the coil circuit; an armature plate having a hub portion secured to the power input shaft and a peripheral portion disposed adjacent the brake stator coil; a control system for electrically energizing the brake stator coil thereby effecting frictional engagement of the armature plate with the pole face as an electromagnetic flux flow path is established around the coil through the stator coil housing and the peripheral armature plate portion; the control system further including a protective circuit that monitors a clutch brake switch, an engine speed signal, and a vehicle speed signal that normally prevents engagement of the clutch brake unless the vehicle speed is below a predetermined level; and a transmission neutral switch is incorporated into the clutch brake system controller for bypassing monitoring of the vehicle speed signal when the transmission neutral switch is actuated. - View Dependent Claims (7, 8, 9, 10)
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11. A method of controlling an electromagnetic clutch brake for a power input shaft of a vehicle powertrain including an engine and a multiple-ratio power transmission, the vehicle having a databus that communicates data from sensors and from the vehicle control system, the method comprising:
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monitoring the data communicated by the databus; controlling engagement of the brake in a protected mode based upon the data communicated from the databus and based upon a timer that times the period of brake engagement; controlling engagement of the brake in a first mode wherein engagement of the brake is prevented in response to a vehicle speed signal that is outside a predetermined range and a second mode wherein a neutral position switch indicates that the transmission is in neutral and engagement of the brake is permitted regardless of the vehicle speed signal. - View Dependent Claims (12, 13, 14)
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Specification