Torque control scheme for low emission lean burn vehicle
    28.
    发明授权
    Torque control scheme for low emission lean burn vehicle 失效
    低排放稀燃车辆扭矩控制方案

    公开(公告)号:US06253546B1

    公开(公告)日:2001-07-03

    申请号:US09519202

    申请日:2000-03-06

    IPC分类号: F01N900

    摘要: A method of minimizing torque disturbances in an internal combustion engine for a vehicle having a lean NOx trap that is periodically purged. The method includes the steps of generating feedforward values of first engine characteristics as a function of desired engine torque and generating feedback values of second engine characteristics as a function of intake manifold pressure. Target values are then calculated for predetermined engine variables based on the first and second engine characteristics. Engine variables are then set to the target values to compensate for torque disturbances resulting from the lean NOx trap purge cycle. According to the disclosed method, the feedforward path schedules the throttle, fuel rate and spark timing based on an engine model to produce a demanded engine torque. The feedback path then uses the values of fuel rate and spark timing to compensate for torque variations. This is accomplished by determining an error term as a function of a reference trajectory intake manifold pressure and measured intake manifold pressure.

    摘要翻译: 一种使具有周期性净化的贫NOx捕集器的车辆内燃机的转矩扰动最小化的方法。 该方法包括以下步骤:根据期望的发动机扭矩产生第一发动机特性的前馈值,并产生作为进气歧管压力的函数的第二发动机特性的反馈值。 然后基于第一和第二发动机特性为预定的发动机变量计算目标值。 然后将发动机变量设置为目标值,以补偿由稀NOx排气净化循环引起的扭矩扰动。 根据所公开的方法,前馈路径基于发动机模型调度节气门,燃料速率和火花正时,以产生所需的发动机扭矩。 然后,反馈路径使用燃料速率和火花正时的值来补偿扭矩变化。 这是通过确定作为参考轨迹进气歧管压力和测量的进气歧管压力的函数的误差项来实现的。