Abstract: A method for measuring the injected mass of a fluid containing urea using a system for injecting the fluid into an exhaust system of a vehicle, in which injecting the fluid includes sequences of series of injections of fluid contained in an accumulator between sequences for starting the pump upon detection of a pressure below a threshold PON and sequences for stopping the pump upon detection of a pressure above a threshold POFF, the method particularly includes computing the injected mass using the complete circuit hydraulic stiffness, based on the hydraulic stiffness KD of the accumulator and the hydraulic stiffness KI of the remainder of the circuit, and includes comparing the computed injected mass with a setpoint injected mass.

Abstract: A method for measuring the injected mass of a fluid containing urea using a system for injecting the fluid into an exhaust system of a vehicle, in which injecting the fluid includes sequences of series of injections of fluid contained in an accumulator between sequences for starting the pump upon detection of a pressure below a threshold PON and sequences for stopping the pump upon detection of a pressure above a threshold POFF, the method particularly includes computing the injected mass using the complete circuit hydraulic stiffness, based on the hydraulic stiffness KD of the accumulator and the hydraulic stiffness KI of the remainder of the circuit, and includes comparing the computed injected mass with a setpoint injected mass.