Evaporative emissions leak check module with VOC measurement

A leak detection module (LDM) comprising:

• a housing;
• a canister valve solenoid (CVS) arranged within the housing and in fluid communication along a first fluid passageway between a canister port and an atmospheric port, the CVS movable between open and closed positions;
• a second fluid passageway in parallel with the first fluid passageway and fluidly connected to the canister port and atmospheric port;
• a pump arranged in the second fluid passageway;
• a CVS check valve arranged in the second fluid passageway fluidly and movable between open and closed positions;
• a pressure sensor in fluid communication with the canister port;
• a volatile organic compound (VOC) gas sensor arranged in one of the first and second fluid passageways and configured to measure the concentration of hydrocarbons (HC) therethrough;
• a mass flow meter arranged in one of the first and second fluid passageways to determine a mass flow rate from the canister port to the atmospheric port;
• and
• a controller arranged in the housing and in communication with the pump, the CVS, the CVS check valve, the pressure sensor, the VOC gas sensor, the mass flow meter, the controller configured to run a leak detection procedure using the pump and operating the CVS and the CVS check valve between the open and closed positions and monitor a pressure within the LDM with the pressure sensor, and the controller configured to determine a quality of emissions by monitoring the concentration of HC and communicate a result.