Cummins Emission Solutions Inc.

Jens Honeck

Joe V Hill

Masoud Ziabakhsh Deilami

Ralf Rohrmueller

Tobias Englert

A controller for an exhaust aftertreatment system receives a pressure signal from a pressure sensor. The pressure sensor generates the pressure signal based on a pressure of treatment fluid in a downstream dosing module. The controller further determines a pressure measurement based on the pressure signal, determines a first injection amount based on the pressure measurement, and causes an upstream injector of an upstream dosing module to inject the treatment fluid according to the first injection amount. The controller further determines a second injection amount based on the pressure measurement and a resistance of a variable resistor and causes a downstream injector of a downstream dosing module to inject the treatment fluid according to the second injection amount.

Systems and methods for controlling a dosing module

An exhaust aftertreatment system includes a first decomposition chamber that receives exhaust and treatment fluid, a first dosing module that includes a first injector that injects the treatment fluid into the first decomposition chamber, and a second decomposition chamber disposed downstream of the first decomposition chamber and that receives the exhaust and the treatment fluid from the first decomposition chamber. The exhaust aftertreatment system further includes a second dosing module that includes a second injector that injects the treatment fluid into the second decomposition chamber and a pressure sensor that generates a pressure signal based on a pressure of the treatment fluid in the second dosing module. The exhaust aftertreatment system further includes a variable resistor selectively switchable between multiple resistances.

An aftertreatment system comprises a reductant storage tank and a selective catalytic reduction (SCR) system including a catalyst for reducing constituents of an exhaust gas. A reductant insertion assembly including a pump and dosing valve is fluidly coupled to the pump and the SCR system. A controller is communicatively coupled to the reductant insertion assembly. The controller is configured to initialize the pump so as to pressurize a reductant in the pump. The dosing valve is opened, thereby expelling the reductant into the SCR system. An operating electrical parameter value of the pump is determined which is indicative of an operating pressure of the pump. The controller determines if the operating electrical parameter value exceeds a predetermined operating threshold. If the operating electrical parameter value exceeds the predetermined operating threshold, the controller stops the pump.

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Tauberbischofsheim, Germany

Jens Honeck