CN104554238B - 一种混合动力汽车的动力转换控制方法 - Google Patents
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Abstract
一种混合动力汽车的动力转换控制方法,所述方法包括如下步骤:1)、检测发动机驱动状态与电机驱动状态的转换时间、起始车速、即时车速、发动机输出功率和电机驱动电流,同时进行空挡判断;2)、若是空挡状态,当由发动机驱动状态向电机驱动状态转换时,分离并锁止离合器,关闭发动机,按油门踏板位置和离合器状态执行电机驱动;当由电机驱动状态向发动机驱动状态转换时,按油门踏板位置和离合器状态执行发动机驱动。本发明提供了一种降低顿挫感、提高乘车舒适性的混合动力汽车的动力转换控制方法。
Description
技术领域
本发明涉及汽车工业技术领域,尤其是一种混合动力汽车的动力转换控制方法。
背景技术
目前,在混合动力汽车上,当电驱动与发动机驱动相互转换时容易出现顿挫感,影响乘坐的舒适性,同时也影响了车辆的使用寿命。
发明内容
为了克服现有动力转换过程出现顿挫感的不足,本发明提供了一种降低顿挫感、提高乘车舒适性的混合动力汽车的动力转换控制方法。
本发明解决其技术问题所采用的技术方案是:
一种混合动力汽车的动力转换控制方法,所述方法包括如下步骤:
1)、检测发动机驱动状态与电机驱动状态的转换时间、起始车速、即时车速、发动机输出功率和电机驱动电流,同时进行空挡判断;
2)、若是空挡状态,当由发动机驱动状态向电机驱动状态转换时,分离并锁止离合器,关闭发动机,按油门踏板位置和离合器状态执行电机驱动;当由电机驱动状态向发动机驱动状态转换时,按油门踏板位置和离合器状态执行发动机驱动;
若未进入空挡状态,检测即时车速,若即时车速在驱动状态开始转换时起始车速的正负5%范围内,当由发动机驱动状态向电机驱动状态转换时,分离并锁止离合器,关闭发动机,按油门踏板位置和离合器状态执行电机驱动;当由电机驱动状态向发动机驱动状态转换时,按油门踏板位置和离合器状态执行发动机驱动;
若即时车速未满足驱动状态开始转换时起始车速的正负5%范围内,进一步检测发动机驱动状态与电机驱动状态的转换时间,若发动机驱动状态与电机驱动状态的转换时间大于等于动力切换时间限定值,当由发动机驱动状态向电机驱动状态转换时,分离并锁止离合器,关闭发动机,按油门踏板位置和离合器状态执行电机驱动;当由电机驱动状态向发动机驱动状态转换时,按油门踏板位置和离合器状态执行发动机驱动;若发动机驱动状态与电机驱动状态的转换时间小于动力切换时间限定值,返回步骤1);
当由电机驱动状态向发动机驱动状态进行转换时,首先控制蓄电池组向发动机起动机提供电流,起动机开始空转至目标转速时起动发动机,再按照如上步骤1)和步骤2)依次运行。
本发明的有益效果主要表现在:减轻动力转换时的顿挫感,提高了汽车的平顺性和乘车的舒适性,以及使用寿命。
附图说明
图1是电机驱动状态向发动机驱动状态进行转换的控制框图。
图2是发动机驱动状态向电机驱动状态进行转换的控制框图。
具体实施方式
下面结合附图对本发明作进一步描述。
参照图1和图2,一种混合动力汽车的动力转换控制方法采用混合动力驱动***,所述混合动力驱动***包括发动机、发动机控制器、变速箱、兼具驱动功能和发电功能的电机、电机控制器、蓄电池组和***控制器,所述发动机通过离合器与所述变速箱连接,所述变速箱通过差速器与驱动桥连接,所述发动机与所述发动机控制器连接,所述电机与所述电机控制器连接,充电装置与所述蓄电池组连接,所述蓄电池组与所述电机控制器连接,所述发动机控制器、所述电机控制器和所述蓄电池组均与所述***控制器连接;
当驱动***进入发动机驱动状态与电机驱动状态之间的相互转换过程时,为了减轻动力转换时的顿挫感,采用如下动力转换控制方法:
如图1所示,由电机驱动状态转换到发动机驱动状态,首先由***控制器控制蓄电池组向发动机起动机提供电流,起动机开始空转至目标转速,目标转速对应的目标车速为Vt,满足如下条件,
V1(1–5%)≤Vt≤V1(1+5%) (1);
其中V1是即时车速。起动发动机,同时离合器解锁、闭合,此时由电机和发动机共同驱动车辆运行,同时***进行空挡判断,转换起始时间为t0;起始车速为V0,起始车速等于目标车速,也等于当前的即时车速;起始驱动功率为P0,起始驱动电压为E0;而转换过程中的即时时间为t1,即时车速为V1,即时驱动功率为P1,即时驱动电压为E1;动力切换时间限定值为Δt,可以设定为3秒;
当发动机刚开始起动时,t0=t1,V0=V1,P0=P1,E0=E1;
发动机的输出功率P按照如下公式逐渐增大:
P=P0δ1(t1-t0)/Δt (2);
其中,δ1=V0/V1;
而电机驱动电流I按照如下公式逐渐减小:
I=P0[1–δ1(t1-t0)/Δt]/E1 (3);
若***进入空挡状态,按油门踏板位置和离合器状态执行发动机驱动;
若***未进入空挡状态,***继续判断即时车速V1是否满足如下设定的条件:
V0(1–5%)≤V1≤V0(1+5%) (4);
即即时车速在驱动状态开始转换时起始车速的正负5%范围内;
若满足此条件,按油门踏板位置和离合器状态执行发动机驱动;若未满足此条件,继续判断由电机驱动状态向发动机驱动状态进行转换的转换时间是否大于等于动力切换时间限定值即t1-t0≥Δt,若转换时间大于等于动力切换时间限定值,按油门踏板位置和离合器状态执行发动机驱动;若转换时间小于动力切换时间限定值,***重新进入空挡判断;
如图2所示,由发动机驱动状态转换到电机驱动状态,转换起始时间为t0′,起始车速为V0′,起始驱动功率为P0′;而转换过程中的即时时间为t2,即时车速为V2,即时驱动功率为P2,即时驱动电压为E2;动力切换时间限定值为Δt′,可以设定为3秒;电机刚开始启动时,t0′=t2,V0′=V2,P0′=P2;
发动机输出功率P按照如下公式逐渐减小:
P=P0′[1–δ2(t2-t0′)/Δt′] (5);
其中,δ2=V0′/V2;
而电机驱动电流I按照如下公式逐渐增大:
I=P0′δ2(t2-t0′)/(Δt′E2) (6);
同时***进行空挡判断,若***进入空挡状态,离合器分离、锁止,关闭发动机,按油门踏板位置和离合器状态执行电机驱动;
若***未进入空挡状态,***继续判断即时车速V2是否满足如下设定的条件:
V0′(1–5%)≤V2≤V0′(1+5%) (7);
即即时车速在驱动状态开始转换时起始车速的正负5%范围内;
若满足此条件,离合器分离、锁止,关闭发动机,按油门踏板位置和离合器状态执行电机驱动;若未满足此条件,继续判断由发动机驱动状态向电机驱动状态进行转换的转换时间是否大于等于动力切换时间限定值即t2-t0′≥Δt′,若转换时间大于等于动力切换时间限定值,离合器分离、锁止,关闭发动机,按油门踏板位置和离合器状态执行电机驱动;若转换时间小于动力切换时间限定值,***重新进入空挡判断。
Claims (1)
1.一种混合动力汽车的动力转换控制方法,其特征在于:所述方法包括如下步骤:
1)、检测发动机驱动状态与电机驱动状态的转换时间、起始车速、即时车速、发动机输出功率和电机驱动电流,同时进行空挡判断;
2)、若是空挡状态,当由发动机驱动状态向电机驱动状态转换时,分离并锁止离合器,关闭发动机,按油门踏板位置和离合器状态执行电机驱动;当由电机驱动状态向发动机驱动状态转换时,按油门踏板位置和离合器状态执行发动机驱动;
若未进入空挡状态,检测即时车速,若即时车速在驱动状态开始转换时起始车速的正负5%范围内,当由发动机驱动状态向电机驱动状态转换时,分离并锁止离合器,关闭发动机,按油门踏板位置和离合器状态执行电机驱动;当由电机驱动状态向发动机驱动状态转换时,按油门踏板位置和离合器状态执行发动机驱动;
若即时车速未满足驱动状态开始转换时起始车速的正负5%范围内,进一步检测发动机驱动状态与电机驱动状态的转换时间,若发动机驱动状态与电机驱动状态的转换时间大于等于动力切换时间限定值,当由发动机驱动状态向电机驱动状态转换时,分离并锁止离合器,关闭发动机,按油门踏板位置和离合器状态执行电机驱动;当由电机驱动状态向发动机驱动状态转换时,按油门踏板位置和离合器状态执行发动机驱动;若发动机驱动状态与电机驱动状态的转换时间小于动力切换时间限定值,返回步骤1);
当由电机驱动状态向发动机驱动状态进行转换时,首先控制蓄电池组向发动机起动机提供电流,起动机开始空转至目标转速时起动发动机,再按照如上步骤1)和步骤2)依次运行。
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