The invention provides hybrid vehicle transmission shift control for thermal management of an electric machine. A system and method for controlling a hybrid vehicle having: an engine; a traction motor; a system and method for controlling a traction motor, and an automated stepped ratio transmission having a plurality of selectable discrete gear ratios, torque converters, and sharing a common cooling fluid with the traction motor, includes a controller, the controller is configured to, in response to a vehicle speed being below a threshold and an engine idling while a temperature of at least two of the traction battery, the electric machine, and the transmission being above an associated threshold, shift the automatic step ratio transmission to neutral to reduce heat generated by the torque converter due to oil shear when the torque converter is stalled. The controller may shift the transmission to a drive gear in response to releasing the brake pedal. A neutral shift may also be performed in response to a high voltage accessory load or an on-board generator load exceeding a threshold.
本公开提供了“用于电机热管理的混合动力车辆变速器换挡控制”。一种用于控制混合动力车辆的系统和方法,混合动力车辆具有:发动机;牵引马达;以及自动阶梯传动比变速器,自动阶梯传动比变速器具有多个可选离散齿轮比、变矩器并且与牵引马达共用公共冷却流体,所述系统和方法包括:控制器,控制器被配置为响应于车辆速度低于阈值且发动机怠速同时牵引电池、电机和变速器中的至少两者的温度高于相关联阈值而将自动阶梯传动比变速器换挡为空挡以减少在变矩器失速时由于油切变而由变矩器产生的热量。控制器可以响应于释放制动踏板而将变速器换挡为行驶挡。还可以响应于高压附件负载或车载发电机负载超过阈值而执行空挡换挡。
Hybrid vehicle transmission shift control for electric machine thermal management
用于电机热管理的混合动力车辆变速器换挡控制
2022-07-22
Patent
Electronic Resource
Chinese
IPC: | B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion |
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