Pump for hvac&r system

A heating, ventilation, air conditioning, and/or refrigeration (HVAC&R) system, comprising:

• a pump configured to pump a fluid along a circuit of the HVAC&R system, wherein the pump comprises:
• a piston configured to reciprocate within a piston chamber of a piston housing;
• and
• a bump stop disposed at an end of the piston chamber, wherein the bump stop comprises an internal switch configured to detect contact between the bump stop and the piston;
• and
• a controller configured to control a stroke velocity of the piston based on a signal received from the internal switch.

A method of operating a pump, comprising:

• energizing a solenoid coil to translate a piston in a first direction within a piston cavity;
• detecting a first contact between the piston and a first bump stop within the piston cavity;
• energizing the solenoid coil to translate the piston in a second direction, opposite the first direction within the piston cavity;
• detecting a second contact between the piston and a second bump stop within the piston cavity;
• determining a time interval between the first contact and the second contact;
• and
• adjusting energization of the solenoid coil based on a difference between the time interval and a previous time interval.