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Methods and systems for assisted direct start control

A connected, hydraulically actuated technology applied in transmission control, elements with teeth, belts/chains/gears, etc. to address delayed clutch engagement, increased clutch engagement response time, reduced engine restarts and vehicle launches Operational quality and other issues

Active Publication Date: 2011-08-31
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, during clutch operation, the response time of clutch engagement may be significantly increased
In addition, the accumulator may cause pressure oscillations in the hydraulic circuit which may further delay clutch engagement upon engine restart
Therefore, this may degrade the quality of the engine restart and vehicle start operations

Method used

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  • Methods and systems for assisted direct start control
  • Methods and systems for assisted direct start control
  • Methods and systems for assisted direct start control

Examples

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Embodiment Construction

[0026] The following description relates to a system and method for maintaining hydraulic line pressure in a transmission clutch hydraulic circuit without operating an auxiliary pump during an engine idling-stop process. Such as Figure 1-3 As shown, a transmission clutch hydraulic circuit including a hydraulically actuated transmission assembly and an accumulator may be connected to the transmission mechanical pump. Under conditions where the flow of the pump is restricted, such as during an engine idling-stop process and before completing the engine restart, the transmission assembly may be isolated from the pump to maintain hydraulic fluid and hydraulic pressure in the isolated clutch hydraulic circuit. In addition, in the event of a drop in hydraulic pressure in the circuit, an accumulator can be connected to the transmission assembly to restore the clutch line pressure. One or more pressure sensors may be included in the hydraulic circuit for pressure feedback-based contro...

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PUM

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Abstract

Methods and systems are provided for pressurizing a hydraulic circuit comprising a hydraulically actuated transmission component and an accumulator. One example method comprises, during an engine idle-stop, adjusting actuation of the hydraulically actuated transmission component over a duration. The method further comprises, during the duration, isolating the accumulator from the hydraulically actuated transmission component when a pressure in the hydraulic circuit is above a threshold, and coupling the accumulator into the hydraulic circuit when the pressure is below the threshold.

Description

Technical field [0001] The present application relates to a method and system for controlling engine deceleration shutdown and subsequent engine restart. Background technique [0002] Vehicles have been developed to automatically perform idle-stop when an idle-stop condition is satisfied, and to automatically restart the engine when the restart condition is satisfied. These idle-stop systems can save fuel, reduce exhaust emissions, reduce noise, and more. [0003] After the engine is idle-stop, the pressure in the hydraulic lines can be maintained to enable the transmission and driveline functions, and reduce the time required to restart the engine and engage the transmission clutch. The transmission hydraulic circuit may include a transmission auxiliary pump (for example, an electric auxiliary pump), so that when the engine is decelerated and turned off and the transmission mechanical pump is not at full flow, the transmission auxiliary pump pressurizes the fluid in the hydraulic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W10/06B60W10/10B60W10/24B60W30/00B60W30/18
CPCF16H61/0021B60W10/115F16H2059/683B60W10/06F16H2061/0034F16H2312/14B60W30/18018F16H59/72
Inventor S-H·李A·O·C·吉布森G·M·皮尔特伦藤井雄二M·P·克拉斯卡
Owner FORD GLOBAL TECH LLC