Multi-mode 2-stroke/4-stroke internal combustion engine

a technology of internal combustion engine and multi-mode, which is applied in the direction of machines/engines, electric control, instruments, etc., can solve the problems of low efficiency of spark ignition (si) engines, low efficiency in comparison to compression ignition (ci), or diesel engines, and high particulate and nox emission characteristics of ci engines, so as to achieve a wide load range of hcci operation, sacrificing efficiency and emissions advantages
US20090048756A1Active Publication Date: 2009-02-19ROBERT BOSCH GMBH
4 Cites 11 Cited by

Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
ROBERT BOSCH GMBH
Publication Date
2009-02-19

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

In a multi-mode, 2-stroke / 4-stroke internal combustion engine operation, by switching the engine stroke from 4-stroke operation to 2-stroke operation so that the combustion frequency is doubled, doubling of the engine power is achieved even at the same work output per cycle. In order to meet the demand of extremely high power, the engine operates in 4-stroke boosted SI operation transitioned from 2-stroke HCCI operation at pre-set level of power and crank speed requirements. By combining the multi-stroke (2-stroke HCCI and 4-stroke HCCI) and multi-mode operation (2-stroke HCCI and 4-stroke boosted SI operation), full load range and overall high efficiency with minimal NOx emission are achieved.
Need to check novelty before this filing date? Find Prior Art

Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a multi-mode, 2-stroke / 4-stroke internal combustion engine operation which maximizes efficiency and power, while minimizing emission.

[0003] 2. Description of Related Art

[0004] Spark Ignition (SI) engines, which are widely used in United States in passenger vehicles, suffer from low efficiency in comparison to Compression Ignition (CI), or Diesel engines, especially in a partial load due to throttling. CI engines, however, exhibit high particulate and NOx emissions characteristics due to their combustion nature. Recently, Homogeneous Charge Compression Ignition (HCCI) engines have been introduced, which have higher efficiency comparable to CI engines as well as minimum particulate and NOx emissions characteristics, with the versatility of using gasoline as well as diesel fuel.

[0005] In HCCI engines, a spark plug or a high-pressure injector is not used for initiation of the ignition of the fu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More