既然是测量的为啥又要提及运动方程？

PAV+

In PAV+ , the trigger functions similarly to other assisted modes of ventilation; the ventilator detects inspiratory effort by instantaneous measures of flow and volume that is pulled in by the patient and delivers pressure assist accordingly [10, 11]. The inspiratory assist is instantaneously calculated from the measured flow and volume using the equation of motion of the respiratory system and an adjustable gain that determines the percentage of the total pressure calculated to be delivered [2, 4]. The total pressure delivered to the respiratory system (Ptotal) is then the sum of Paw and Pmus and it overcomes both resistive and elastic recoil pressure:

Ptotal= Paw + Pmus=（flow×resistance）+（volume×elastance）     （2）

PAV+

在PAV+模式中，吸气触发的功能类似于其他辅助通气模式，呼吸机通过瞬时测量患者产生的吸气流速和容量来检测吸气努力，并相应地提供压力辅助。吸气辅助的大小由呼吸系统的运动方程即时测量的流速和容积以及可调增益（该增益确定了辅助压力占计算出的输送总压的百分比）计算出来的。输送到呼吸系统的总压力（Ptotal）是Paw和Pmus的总和，它克服了气道阻力和弹性回缩力：

Ptotal= Paw + Pmus=（flow×resistance）+（volume×elastance）     （2）

既然是测量的为啥又要提及运动方程，使用运动方程不就是计算的吗？an adjustable gain that determines the percentage of the total pressure calculated to be delivered   可调增益（该增益确定了辅助压力占计算出的输送总压的百分比）

理解的对吗？