System and method for estimating diesel exhaust treatment liquid volume

The present disclosure provides a system and method for estimating a diesel exhaust treatment liquid volume. Methods and systems are provided for estimating a volume of a diesel exhaust fluid (DEF) contained within a DEF tank. In one example, a method for estimating a volume of a liquid DEF in a DEF tank during DEF freeze conditions may include activating a heater contained within the DEF tank and then switching estimating the volume of the liquid DEF via a first transfer function to estimating the volume of the liquid DEF via a second transfer function. 本公开提供了"用于估计柴油机尾气处理液体积的系统和方法"。提供了用于估计包含在柴油机尾气处理液(DEF)罐内的液体DEF的体积的方法和系统。在一个示例中，一种用于在DEF冻结条件期间估计DEF罐中的液体DEF的体积的方法可以包括激活包含在所述DEF罐内的加热器，然后将经由第一传递函数估计所述液体DEF的体积切换为经由第二传递函数估计所述液体DEF的体积。