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    Method of leak detection during low engine vacuum for an evaporative emission control system
    2.
    发明授权
    Method of leak detection during low engine vacuum for an evaporative emission control system 失效
    用于蒸发排放控制系统的低发动机真空期间的泄漏检测方法

    公开(公告)号：US5715799A

    公开(公告)日：1998-02-10

    申请号：US610947

    申请日：1996-03-05

    申请人： William B. Blomquist ,  Gary D. Dawson ,  Roland T. Richardson ,  Glen Tallarek ,  John E. Letcher ,  Mark E. Hope

    发明人： William B. Blomquist ,  Gary D. Dawson ,  Roland T. Richardson ,  Glen Tallarek ,  John E. Letcher ,  Mark E. Hope

    IPC分类号： F02M25/08 ,  F02M37/04

    CPC分类号： F02M25/0818

    摘要： A method of leak detection for an evaporative emission control system during periods of low engine vacuum includes the steps of pulsing a leak detection pump at a predetermined rate and determining whether engine vacuum level is low. The method also includes the steps of maintaining pressurization of the evaporative emission control system if the engine vacuum level is low, maintaining pressurization behind a vapor canister vent valve if the engine vacuum level is low, and detecting for leaks in the evaporative emission control system after a normal engine vacuum level is attained.

    摘要翻译： 在低发动机真空期间的蒸发排放控制系统的泄漏检测方法包括以预定速率脉冲泄漏检测泵并确定发动机真空度是否低的步骤。 该方法还包括以下步骤：如果发动机真空度低，则保持蒸发排放控制系统的加压，如果发动机真空度低，则在蒸汽罐排气阀后面保持加压，以及在蒸发排放控制系统中的泄漏检测之后 达到正常的发动机真空度。

    Method of testing an evaporative emission control system
    3.
    发明授权
    Method of testing an evaporative emission control system 失效
    蒸发排放控制系统的测试方法

    公开(公告)号：US5606121A

    公开(公告)日：1997-02-25

    申请号：US611137

    申请日：1996-03-05

    申请人： William B. Blomquist ,  Gary D. Dawson ,  Roland T. Richardson ,  Glen Tallarek ,  John E. Letcher ,  Mark E. Hope

    发明人： William B. Blomquist ,  Gary D. Dawson ,  Roland T. Richardson ,  Glen Tallarek ,  John E. Letcher ,  Mark E. Hope

    IPC分类号： G01M3/32 ,  G01M15/00

    CPC分类号： G01M3/3236

    摘要： A method of testing an evaporative emission control system to determine if the evaporative emission control system has reached a predetermined pressure includes the steps of pulsing a leak detection pump at a predetermined rate and determining if a last pump period is greater than or equal to a predetermined test mode period threshold. The method also includes the steps of pressurizing the evaporative emission control system if the last pump period is less than a test mode period threshold and continuing the method if the last pump period is equal to or greater than the test mode period threshold.

    摘要翻译： 一种测试蒸发排放控制系统以确定蒸发排放控制系统是否已经达到预定压力的方法包括以预定速率脉动泄漏检测泵的步骤，并且确定最后泵周期是否大于或等于预定的 测试模式周期阈值。 该方法还包括以下步骤：如果最后泵周期小于测试模式周期阈值，则对蒸发排放控制系统进行加压，并且如果最后泵周期等于或大于测试模式周期阈值，则继续该方法。

    Purge system flow monitor and method
    4.
    发明授权
    Purge system flow monitor and method 失效
    吹扫系统流量监测器和方法

    公开(公告)号：US5651349A

    公开(公告)日：1997-07-29

    申请号：US570219

    申请日：1995-12-11

    申请人： Gregory J. Dykstra ,  Mark E. Hope ,  Kim M. Person ,  John E. Letcher ,  James M. Witalec

    发明人： Gregory J. Dykstra ,  Mark E. Hope ,  Kim M. Person ,  John E. Letcher ,  James M. Witalec

    IPC分类号： F02D41/00 ,  F02D41/22 ,  F02M25/08 ,  F02M33/02

    CPC分类号： F02M25/0809 ,  F02M25/08

    摘要： A system and method of monitoring the purge flow in an evaporative emission control purge system of a motor vehicle. Signals indicative of engine speed, fuel control and automatic idle speed position are measured and used to determine whether the purge flow system is operating properly. With purge flow activated, the amount of purge flow is increased in accordance with a ramping rate and the measured signals are monitored to determine whether or not a change occurs in any one of the engine speed, fuel control and AIS position signals.

    摘要翻译： 一种在机动车辆的蒸发排放控制清除系统中监测吹扫流量的系统和方法。 测量指示发动机转速，燃料控制和自动怠速位置的信号，并用于确定吹扫流量系统是否正常工作。 随着清洗流量的激活，清洗流量根据斜坡率增加，监测测量信号以确定发动机转速，燃料控制和AIS位置信号中是否发生变化。

    Method for determining fuel composition using oxygen sensor feedback control
    5.
    发明授权
    Method for determining fuel composition using oxygen sensor feedback control 失效
    使用氧传感器反馈控制确定燃料成分的方法

    公开(公告)号：US5255661A

    公开(公告)日：1993-10-26

    申请号：US933551

    申请日：1992-08-24

    申请人： Robert J. Nankee, II ,  John E. Letcher

    发明人： Robert J. Nankee, II ,  John E. Letcher

    IPC分类号： F02D19/08 ,  F02D33/00 ,  F02D41/00 ,  F02M37/00 ,  F02M7/00

    CPC分类号： F02D33/006 ,  F02D19/0665 ,  F02D19/084 ,  F02D19/088 ,  F02D41/0025 ,  F02D41/0042 ,  F02M25/089 ,  F02M37/0064 ,  F02D2200/0612 ,  F02M37/0052 ,  F02M37/0082 ,  F02M37/0088 ,  Y02T10/36

    摘要： A flexible fuel vehicle is a vehicle capable of operating on alcohol, gasoline, or any combination of these two fuels. Because of the unique properties of alcohol fuels, modifications to engine operating characteristics are required to compensate for the varying percentage of alcohol in the fuel. A method is provided for determining the percent alcohol content of the fuel in the fuel tank, utilizing the oxygen sensor feedback control loop to sense changes in air/fuel ratio and relay that information to the engine controller so that dependant variables can be adjusted accordingly. The method includes placing the fuel pump in the fuel tank along with a mixed fuel accumulator so that a known and slowly varying percentage of alcohol in the fuel is provided to the engine, especially during open loop operation.

    摘要翻译： 灵活的燃料车辆是能够对酒精，汽油或这两种燃料的任何组合进行操作的车辆。 由于酒精燃料的独特性质，需要对发动机运行特性进行修改以补偿燃料中酒精的变化百分比。 提供了一种用于确定燃料箱中燃料百分含量的方法，利用氧传感器反馈控制回路来检测空燃比的变化并将该信息中继到发动机控制器，从而相应地调整因变量。 该方法包括将燃料泵与混合燃料储存器一起放置在燃料箱中，使得向发动机提供燃料中已知且缓慢变化的百分比的醇，特别是在开环操作期间。