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    • 41. 发明授权
    • Method and system for estimating cylinder charge for internal combustion engines having variable valve timing
    • US06754575B2
    • 2004-06-22
    • US10289591
    • 2002-11-07
    • Julia Helen BucklandIlya V. KolmanovskyJing SunJoseph Scillieri
    • Julia Helen BucklandIlya V. KolmanovskyJing SunJoseph Scillieri
    • G06G770
    • F02D41/0062F02D41/18F02D2041/001F02D2200/0402Y02T10/47
    • A method for determining cylinder air charge and/or cylinder burned gas for an internal combustion engine system. The engine system includes cylinders, each one of such cylinders having at least one intake valve and at least one exhaust valve in communication with such cylinder. The method determines one of a plurality of different scenarios, each one of the scenarios representing a geometrical relationship between opening and closing of the intake valve relative to closing of the exhaust valve. The cylinder air charge and/or cylinder burned gas is calculated in accordance with the determined one of the plurality of scenarios. In one embodiment, the engine system stores a plurality of different software modules. The method selects one of the plurality of software modules in accordance with the determined one of the plurality of scenarios. The cylinder air charge and/or cylinder burned gas calculation comprises executing the selected one of the modules. In one embodiment, a memory stores a relationship between volume occupied by residual gas in the at least one cylinders at a predetermined position of the at least one cylinder in the engine during the cycle determined in accordance with each one of the plurality of scenarios for each of a plurality of different intake valve opening and exhaust valve closing conditions. The method includes: determining from the memory the volume occupied by residual gas in the at least one cylinders at a predetermined position of the at least one cylinder in the engine during the cycle for the intake valve opening and exhaust valve closing conditions; and, determining from volume occupied by residual gas in the at least one cylinders at a predetermined position of the at least one cylinder in the engine during the cycle the cylinder air charge and/or cylinder burned gas.
    • 48. 发明授权
    • Idle speed control for DISI engines
    • DISI发动机空转速度控制
    • US5894828A
    • 1999-04-20
    • US951373
    • 1997-10-16
    • Narayanan SivashankarJing Sun
    • Narayanan SivashankarJing Sun
    • F02B75/12F02D41/14F02D41/16F02D41/30F02M3/00
    • F02D41/1406F02D41/1498F02D41/16F02D41/3029F02B2075/125F02D2041/389F02D2200/1015
    • An idle speed control system for a direct injection spark ignition engine controlled to operate in either homogeneous air/fuel modes or stratified air/fuel modes. A desired idle speed is set to optimize fuel economy and avoid rough engine operation during various air/fuel operating modes. During rough idle conditions and non stoichiometric air/fuel operation engine air/fuel is enriched until either rough idle ceases or a rich air/fuel limit is reached. During smooth idle operation, and non stoichiometric air/fuel operation, engine air/fuel is enleaned until either rough idle occurs, a lean air/fuel limit reached, or desired fuel economy attained. After the lean limit is reached, and when operating in a non-stoichiometric non-stratified air/fuel mode, and when not operating at desired fuel economy, ignition timing is advanced until an advance limit is reached and desired idle speed is thereafter decreased.
    • 用于直喷式火花点火发动机的怠速控制系统,其被控制为以均匀的空气/燃料模式或分层的空气/燃料模式操作。 设定所需的空转速度以优化燃油经济性,并避免在各种空气/燃料运行模式期间发动机运转粗糙。 在怠速条件和非化学计量的空气/燃料运行的发动机中,空气/燃料被富集,直到怠速停止或达到浓空气/燃料限制。 在平稳的怠速运行和非化学计量的空气/燃料操作期间,发动机空气/燃料被排出,直到发生怠速发生,达到稀薄空气/燃料限制或达到期望的燃料经济性。 在达到稀薄极限之后,并且当以非化学计量的非分层空气/燃料模式运行时,并且当不以期望的燃料经济性运行时,点火正时进行直到达到提前极限,然后降低所需的怠速。