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US 6,950,737 B2Granted
Transmission control system
AssigneeNACCO Materials Handling Group, Inc.
InventorRobert Lee Chess
Life of this patent
Estimating the term…
Abstract
A transmission system includes a Central Processing Unit (CPU) that controls truck braking energy by sharing energy dissipation between clutch packs. The CPU reduces engine speed and then slips the two clutch packs at the same time to maintain a reduced turbine speed for a torque converter. In another aspect of the transmission system, energy loss is reduced during high draw bar pull conditions. The engine speed is modulated to trim energy peaks at low pushing or pulling speeds. An additional transmission gear reduction restores the lost pushing or pulling forces while generating less heat in the torque converter.
Claims19
A method for controlling speed of a vehicle, comprising:
- monitoring a throttle position;
- decelerating the vehicle at a deceleration rate associated with the monitored throttle position when the throttle position indicates a braking condition;
- and
- slipping a first clutch pack associated with a forward vehicle direction and slipping a second clutch pack associated with a reverse vehicle direction at the same time when the braking condition is indicated.
1 more element
A method for controlling speed of a vehicle, comprising:
- monitoring a throttle position;
- decelerating the vehicle at a deceleration rate associated with the monitored throttle position when the throttle position indicates a braking condition;
- slipping a first clutch pack associated with a forward vehicle direction and slipping a second clutch pack associated with a reverse vehicle direction at the same time when the braking condition is indicated;
- reducing pressure for the first clutch pack when the braking condition is detected;
- and
- increasing pressure for the second clutch pack when the braking condition is detected.
3 more elements
A method for controlling speed of a vehicle, comprising:
- monitoring a throttle position;
- decelerating the vehicle at a deceleration rate associated with the monitored throttle position when the throttle position indicates a braking condition;
- slipping a first clutch pack associated with a forward vehicle direction and slipping a second clutch associated with a reverse vehicle direction at the same time when the braking condition is indicated;
- and
- applying slipping pressure for the first clutch pack and applying slipping pressure for the second clutch pack corresponding to the monitored throttle position.
2 more elements
A method for controlling speed of a vehicle, comprising:
- monitoring a throttle position;
- decelerating the vehicle at a deceleration rate associated with the monitored throttle position when the throttle position indicates a braking condition;
- slipping a first clutch pack associated with a forward vehicle direction and slipping a second clutch pack associated with a reverse vehicle direction at the same time when the braking condition is indicated;
- and
- slipping a third or directional clutch packs associated with the same direction of vehicle travel as the first clutch pack when the braking condition is indicated.
2 more elements
A braking system, comprising:
- a first clutch pack associated with a first direction of vehicle travel;
- a second clutch pack associated with a second direction of vehicle travel;
- and
- a processor monitoring an accelerator position and simultaneously slipping both the first clutch pack and the second clutch pack when the monitored accelerator position indicates a braking condition thereby distributing the breaking energy between both the first and second clutch pack.
1 more element
A braking system, comprising:
- a first clutch pack associated with a first direction of vehicle travel;
- a second clutch pac associated with a second direction of vehicle travel;
- a processor monitoring an accelerator position and simultaneously slipping both the first clutch pack and the second clutch pack when the monitored accelerator position indicates a braking condition;
- and
- an accelerator sensor, the processor automatically initiating proportional clutch pack braking using first and second clutch pack when the accelerator sensor indicates an accelerator pedal is being released and has moved past an idle position.
2 more elements
A braking system, comprising:
- a first clutch pack associated with a first direction of vehicle travel;
- a second clutch associated with a second direction of vehicle travel;
- a processor monitoring an accelerator position and simultaneously slipping both the first clutch pack and the second clutch pack when the monitored accelerator position indicates a braking condition;
- and
- a direction sensor ed by the processor for initiating clutch pack braking during a power reversal.
2 more elements
A braking system, comprising:
- a first clutch pack associated with a first direction of vehicle travel;
- a second clutch pack associated with a second direction of vehicle travel;
- a processor monitoring an accelerator position and simultaneously slipping both the first clutch pack and the second clutch pack when the monitored accelerator position indicates a braking condition;
- and
- a memory storing clutch pack pressure parameters associated with different accelerator positions, the processor using the clutch pack pressure parameters in memory associated with the monitored accelerator position to activate the first and second clutch packs.
2 more elements
A braking system, comprising:
- a first clutch pack associated with a first direction of vehicle travel;
- a second clutch pack associated with a second direction of vehicle travel;
- a processor monitoring an accelerator position and slipping both the first clutch pack and slipping the second clutch pack when the monitored accelerator position indicates a braking condition;
- and
- wherein the first clutch pack is associated with a current forward direction of vehicle travel and the second clutch pack is associated with a current reverse direction of vehicle travel, the processor increasing a slipping pressure for the second clutch pack to reduce a torque converter speed to a substantially constant low torque converter speed while at the same time applying slipping pressure for the first clutch pack that maintains the substantially constant low torque converter speed and also distributes braking energy between the first and second clutch pack.
2 more elements
A braking system, comprising:
- a first clutch pack associated with a first direction of vehicle travel;
- a second clutch pack associated with a second direction of vehicle travel;
- and
- a processor monitoring an accelerator position and simultaneously slipping both the first clutch pack d the second clutch pick when the monitored accelerator position indicates a braking condition;
- including a third or additional clutch packs associated with the same direction of vehicle travel as the first clutch pack;
- and
- a processor monitoring an accelerator position and simultaneously slipping the first clutch pack and two or more additional clutch packs when the monitored accelerator position indicates a braking condition.
4 more elements
Dependencies are inferred from the claim text.