Substance dispenser for treating exhaust gas and method

A vehicle having an internal combustion engine associated therewith, the internal combustion engine having an exhaust port connected to an exhaust pipe, the exhaust pipe mounted to the vehicle and containing at least one after-treatment device, the vehicle comprising:

• a storage reservoir for an additive solution, the storage reservoir comprising:
• an internal reservoir volume arranged to retain a quantity of the additive solution,
• a canister containing an amount of an additive in solid form,
• an inlet passage containing a filter, the inlet passage being in fluid communication with the reservoir volume and arranged for providing a filling passage for adding a liquid to the reservoir volume,
• a concentration sensor arranged to sense an additive concentration of the additive solution, and
• a doser operably associated with the storage reservoir and arranged to admit a predetermined portion of the additive solution;
• a conduit fluidly connecting the doser with an injector, wherein the injector is operably associated with the exhaust pipe, wherein the injector is disposed upstream of the at least one after-treatment device;
• and
• a control module operably associated with the internal combustion engine, the concentration sensor, and the doser.

A method for providing an additive to an injection device disposed within an exhaust stream, comprising the steps of:

• storing an additive solution in a storage reservoir;
• deciding in a control module to dispense a desired amount of the additive into the exhaust stream;
• determining a concentration of the additive in the additive solution with the control module;
• at times when the concentration of the additive in the additive solution is within an acceptable range, calculating a desired volume of the additive solution to be injected based the concentration of the additive in the additive solution;
• dosing the desired volume with a doser;
• and
• injecting the desired volume of the additive solution into the exhaust stream with the injection device.