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Dual combustion mode engine

An engine and internal combustion engine technology, applied in combustion engines, internal combustion piston engines, engine components, etc., can solve problems such as poor transient response, achieve the effects of optimizing fuel efficiency, overcoming starting difficulties, and improving fuel efficiency

Inactive Publication Date: 2007-10-03
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A disadvantage of HCCI combustion is that it has a poorer transient response to changing torque demands and is orders of magnitude slower than SI combustion
The inventors of the present invention have realized that HCCI operation does not provide vehicle operators with the kind of response they expect from a SI engine

Method used

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Examples

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Embodiment Construction

[0037] In FIG. 1 , a multi-cylinder internal combustion engine 10 is shown. As an example, engine 10 is shown having six cylinders, divided into two banks of three cylinders each. A bank of cylinders 12 is adapted to operate in a conventional spark ignition (SI) mode. Another bank of cylinders 14 is adapted to operate in a homogeneous charge compression ignition (HCCI) mode. Combustion air is provided to each cylinder bank via an intake manifold 30 , which is separate so that air for cylinder bank 12 is not mixed with air for cylinder bank 14 . Each cylinder bank has a throttle valve 24, or other means for controlling flow. SI combustion characteristically occurs with a stoichiometric ratio of air and fuel, meaning that if combustion is complete, all fuel and oxygen are completely combusted to form H2O and CO2. To control the amount of torque produced in SI combustion, the amount of air is controlled by throttle valve 24 . The amount of fuel added to the air via injector 2...

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Abstract

An internal combustion engine is disclosed in which at least one cylinder is adapted to run in homogeneous-charge compression-ignition (HCCI) combustion mode and at least one cylinder is adapted to run in spark-ignition (SI) combustion mode with the HCCI cylinder having a compression ratio at least 2 ratios higher than the SI cylinder. The intakes and exhausts of the HCCI and SI cylinders are separated with a throttle valve disposed in each intake and exhaust aftertreatment devices tailored to each combustion mode disposed in the exhausts.

Description

technical field [0001] The present invention relates to an internal combustion engine in which some cylinders are exclusively operated in the spark ignition combustion mode and the remaining cylinders are exclusively operated in the uniform charge compression ignition mode. Background technique [0002] It is known to those skilled in the art that homogeneous charge compression ignition combustion can provide high fuel efficiency and low emission operation in internal combustion engines. However, HCCI operation is only possible over a narrow engine torque range, which is about one-third that of a conventional spark-ignition engine. Therefore, most of the HCCI engines developed are dual-mode engines using HCCI under low torque conditions. When higher torque is required, operation transitions to other combustion modes such as spark ignition combustion or non-uniform compression ignition combustion (diesel). Challenges posed by such transitions include, for example: torque ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D43/00F02D17/00F02M25/07F01N3/24F01N3/08F02B37/00F02B39/00
CPCF02D41/3035F02D17/02Y02T10/128F02B37/00F02M69/046F01N2013/026Y02T10/22F01N13/107F01N3/0842F01N3/0814F01N5/02F01N13/0097F01N2570/14F02D41/3076F02D41/0082F01N13/04F01N13/011Y02T10/12F02B69/00F02B75/18F02D15/00
Inventor 约翰·布雷维克克利福德·卡尔森
Owner FORD GLOBAL TECH LLC
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