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Methods and system for cranking an engine

An engine starting and engine technology, which is applied in the direction of motor starting, engine starting, and engine-driven traction, etc., can solve problems such as increasing engine stall engine emissions, reduce engine emissions, reduce possibility, and improve motor torque. produced effect

Pending Publication Date: 2021-08-20
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, it may not be desirable to charge the power storage device via an electric machine that receives input from engine rotation because loading the engine during and after engine acceleration may increase the likelihood of engine stall and engine emissions

Method used

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  • Methods and system for cranking an engine
  • Methods and system for cranking an engine
  • Methods and system for cranking an engine

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Embodiment Construction

[0014] This instruction is concerned with operating the DC / DC converter of the vehicle. The DC / DC converter can operate in a manner that can improve engine starting and reduce engine emissions. In particular, the voltage output of the DC / DC converter may be adjusted during and immediately after engine cranking in response to the operating state of an ultracapacitor that supplies charge to electrical consumers on the vehicle. Specifically, if the state of charge (SOC) of the super capacitor is low, the output voltage of the DC / DC converter can be increased to boost the voltage of the low voltage bus. By increasing the voltage of the low-voltage bus, the supercapacitor can reach the desired SOC earlier. Additionally, the output of the DC / DC converter may be adjusted in response to vehicle operating conditions during engine cranking so that the electric machine has sufficient torque capacity to spin the engine at a desired speed during engine cranking. By ensuring that the vehi...

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PUM

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Abstract

The invention relates to a method and system for cranking an angine. A method for operating a vehicle that includes a DC / DC converter is described. In one example, the method includes adjusting an output voltage of the DC / DC converter after the DC / DC converter is used to crank an engine. The output voltage of the DC / DC converter may be adjusted responsive to a state of charge of an ultra-capacitor.

Description

technical field [0001] The present description relates to methods and systems for operating a vehicle including a direct current to direct current (DC / DC) converter. The method and system may reduce engine cranking time and increase the likelihood of engine cranking during engine cranking cycles. Background technique [0002] The vehicle may include an internal combustion engine that may be started by rotating the engine and supplying fuel to the engine via an electric machine. During many operating conditions, the electric machine may spin the engine at a speed that promotes combustion within the engine. Electricity from the low voltage bus may be provided to the motor. The low voltage bus can also distribute power to other devices such as steering and entertainment systems. Power can be supplied to other devices via the power storage device, and the power storage device can be buffered from the low voltage power bus via diodes or other current limiting devices. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02N11/08
CPCF02N11/08F02N11/0866F02N2011/0888F02N11/006F02N11/04F02N2011/0885F02N2200/061F02N2200/064B60L58/12B60L2240/445B60L2210/10B60L50/16Y02T10/70Y02T10/72Y02T10/7072H02J1/08H02J7/345H02J7/1423H02J2310/46B60K2006/268B60K2006/4825B60W20/40B60W2510/244B60W2510/246B60W2510/0676B60W2510/0638B60W2710/305Y02T10/62B60L58/20B60W10/08B60W10/26F02N2200/063B60L2240/547F02N2011/0896
Inventor 亚历山大·奥康纳·吉布森约翰·埃里克·罗林杰大卫·汉考克威廉·泰勒马克·E·希尔兹
Owner FORD GLOBAL TECH LLC
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