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Methods and system for downshifting a transmission

A technology of a transmission and an operation method, applied in the directions of road vehicle drive control system, multiple different prime movers of a general power plant, transportation and packaging, etc., to achieve the effect of reducing torque disturbance and improving downshifting

Active Publication Date: 2018-05-25
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the vehicle is decelerating and the transmission input shaft torque is lower than desired, a torque disturbance can propagate through the driveline when the transmission downshifts

Method used

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  • Methods and system for downshifting a transmission
  • Methods and system for downshifting a transmission
  • Methods and system for downshifting a transmission

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Embodiment Construction

[0015] The present description relates to controlling transmission input shaft torque for a hybrid vehicle. Hybrid vehicles can include such figure 1 Internal combustion engine shown. Internal combustion engines can be included in such Figure 2A with Figure 2B shown in the drive train or powertrain of a hybrid vehicle. Engines can include such as Figure 3A with Figure 3B Dedicated exhaust gas recirculation (EGR) cylinder shown. Engines can also include Figure 4A with Figure 4B Deactivated cylinder and deactivated poppet shown. can be based on Figure 5A with Figure 5B method of operating a hybrid powertrain or a hybrid powertrain. Image 6 show the basis Figure 5A with Figure 5B The sequence of vehicle operations for the method.

[0016] refer to figure 1 , the internal combustion engine 10 is controlled by the electronic engine controller 12, the internal combustion engine 10 includes a plurality of cylinders, in figure 1 One of the cylinders is shown...

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PUM

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Abstract

The invention relates to methods and system for downshifting a transmission. Systems and methods for operating a driveline of a hybrid vehicle are disclosed. In one example, an engine may enter or stay in one of two cylinder deactivation modes or enter or stay in a combustion mode in response to a request to downshift a transmission while a vehicle in which the engine resides is coasting.

Description

technical field [0001] The present description relates to methods and systems for operating a hybrid powertrain including an engine and an electric machine to propel a vehicle. The method and system may be particularly useful for hybrid vehicles that downshift when the driver demanded torque is less than a threshold level. Background technique [0002] Vehicles can coast from time to time, and due to frictional losses and windage losses, vehicles can slow down while coasting. A controller of the vehicle may schedule a downshift of the multi-speed automatic transmission in response to the vehicle decelerating below a threshold shift schedule vehicle speed. By downshifting the transmission, the vehicle can be prepared for acceleration at a later time. Further, downshifting the transmission may help maintain engine speed within a desired range. However, if the vehicle is decelerating and the transmission input shaft torque is lower than desired, a torque disturbance can prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W10/06B60W10/08B60W10/10B60W20/00
CPCB60W10/06B60W10/08B60W10/10B60W20/00B60W2710/0616B60W2710/083B60W2510/1025F02D2200/0406F02D2200/1002F02D41/023F02D2041/1412F02D2250/21F02D41/0087F02D41/0225F02D41/123Y10S903/93Y10S903/919B60W2510/1005B60W2710/0683B60W2710/0666B60W30/18072B60K6/547B60W2710/0627B60W2030/18081B60K6/48B60K2006/4825B60W2710/1022B60Y2300/432B60W20/15Y02T10/62Y02T10/60B60W20/10B60Y2200/92B60Y2300/18066B60Y2300/182B60Y2300/60B60Y2300/437
Inventor J·A·都尔瑞
Owner FORD GLOBAL TECH LLC
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