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发明公开
CN102661386A 换档控制方法、系统及用于牵引工作的工程机械 有权

换档控制方法、系统及用于牵引工作的工程机械
摘要：
本发明公开了一种换档控制方法，包括：获取当前油门状态下的涡轮扭矩、发动机扭矩和档位信号；计算得到扭矩比；比对扭矩比和预设闭锁扭矩比；当所述扭矩比低于所述预设闭锁扭矩比时，闭锁液力变矩器；判断所述档位信号为空档信号时，若是，保持当前档位；否则比对所述扭矩比和预设换档扭矩比范围；当所述扭矩比处于预设换档扭矩比范围，保持当前档位；当所述扭矩比小于所述预设换档扭矩比范围中的最小扭矩比，解锁液力变矩器，且当判断所述档位信号不是最高档位信号时，升高档位；当所述扭矩比大于所述预设换档扭矩比范围中的最大扭矩比时，解锁液力变矩器，且判断所述档位信号不是最低档位信号时，降低档位。
摘要（英）：

The invention discloses a shifting controlling method. The method comprises the steps of: obtaining a turbine torque, an engine torque and a gear signal under the current throttle state; calculating to obtain a torque ratio; comparing the torque ratio with a preset locking torque ratio; when the torque ratio is lower than the preset locking torque ratio, locking a hydraulic torque converter; judging whether the gear signal is a neutral signal or not, if so, keeping the current gear; or else, comparing the torque ratio with the preset shifting torque ratio range; when the torque ratio is in the preset shifting torque ratio range, keeping the current gear; if the torque ratio is smaller than the minimum torque ratio in the preset shifting torque ratio range, unlocking the hydraulic torque converter; and when judging that the gear signal is not the highest gear signal, rising the gear; when the torque ratio is larger than the maximum torque ratio in the preset shifting torque ratio range, unlocking the hydraulic torque converter; and lowering the gear when judging that the gear signal is not the lowest gear signal.

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