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Main pump to auxiliary pump hand-off strategy in hybrid electric vehicle

A hybrid electric and auxiliary pump technology, which is applied to hybrid vehicles, motor vehicles, vehicle components, etc., can solve the problems of vehicle loss of power and control, and auxiliary pumps are prone to failure

Active Publication Date: 2015-03-04
CHRYSLER GROUP LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, conventional hybrid transmissions tend to prematurely shut down the gas powered engine before the auxiliary pump is fully operational
Specifically, the auxiliary pump is prone to failure during its initial activation phase in cold ambient temperatures or cold transmission fluid temperatures
When this happens, the vehicle may lose power and control

Method used

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  • Main pump to auxiliary pump hand-off strategy in hybrid electric vehicle
  • Main pump to auxiliary pump hand-off strategy in hybrid electric vehicle
  • Main pump to auxiliary pump hand-off strategy in hybrid electric vehicle

Examples

Experimental program
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Effect test

Embodiment Construction

[0012] figure 1 The mechanical and hydraulic layout 100 of a hybrid power transmission is shown in . As shown in layout 100 , gas powered engine 120 rotates crankshaft 122 . The main pump impeller 130 is attached to the crankshaft 122 inside the transmission case 110 . Oil from the sump enters the main pump impeller 130 at an input 132 and exits at an output 134 as pressurized oil. Drain 136 is coupled to boosted output 134 . As explained below, the pressurized oil exits the transmission case 110 after passing through the check valve 150 .

[0013] exist figure 1 Alternative oil flow paths that rely on electric motors are also shown in layout 100 of FIG. Auxiliary pump 128 includes electric motor 125 and impeller 140 . Electric motor 125 is battery powered and functions to pump oil from the sump via output 142 into auxiliary pump impeller 140 . Oil is pressurized by auxiliary pump impeller 140 and output via output 144 to check valve 150 . Drain 146 is coupled to boost...

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PUM

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Abstract

A method and system of reducing an occurrence of hydraulic pressurization loss during the transition from gas-powered engine operation to electric motor operation in a hybrid electric vehicle. The method includes maintaining operation of the gas-powered engine while initiating an auxiliary pump with its associated electric motor. A master timer is initiated. Once the auxiliary pump exceeds a minimum speed threshold, a delay time period is determined during which operation of the auxiliary pump is tested. If the auxiliary pump does not stall during the delay time period and the master timer has not yet expired, the gas-powered engine is allowed to shut-off.

Description

technical field [0001] The present invention relates to systems and methods for operating a hybrid electric vehicle transmission, and more particularly to systems and methods for preventing loss of hydraulic boost during initialization of an electric propulsion mode of the vehicle. Background technique [0002] Hybrid electric vehicles alternate between gas-powered engine operation and electric motor operation. The transition from operating the vehicle in gas-powered mode to operating the vehicle in electric mode, and vice versa, occurs while the vehicle is being used. Therefore, efficient transition from one mode of operation to another is important so that no loss of vehicle function or control occurs during operation of the vehicle. For example, when transitioning from gas powered operation to electric mode operation, care must be taken to ensure that the vehicle's electric mode operation is fully functional before the vehicle's gas powered engine is shut down. [0003]...

Claims

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Application Information

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IPC IPC(8): B60W20/00B60W30/192F16H61/00
CPCB60W30/192F16H2061/1208B60W20/40F16H61/0031B60W2550/12F16H2312/14B60W2510/107B60W2555/20
Inventor 约瑟夫·伊瓦奇科古鲁纳特·凯达尔-东加尔卡
Owner CHRYSLER GROUP LLC