1. A method for controlling the operation of a refrigerant vapor compression system for cooling a temperature-controlled space having a plurality of temperature controlled zones, the refrigerant vapor compression system including a refrigerant circuit through which a refrigerant mass flow is circulated by a compression device, said method comprising the steps of:
controlling the refrigerant mass flow to provide a cooling capacity of the refrigerant vapor compression system in response to a collective cooling demand for said plurality of temperature controlled zones; and
selectively dividing the refrigerant mass flow amongst the plurality of temperature controlled zones.
2. A method for controlling the operation of a refrigerant vapor compression system as recited in claim 1 further comprising the step of estimating the cooling demand of each respective zone of the plurality of temperature controlled zones as a function of a difference between a sensed temperature and a related set point temperature associated with each respective zone of the plurality of temperature controlled zones.
3. A method for controlling the operation of a refrigerant vapor compression system as recited in claim 1 wherein the step of controlling the refrigerant mass flow comprises:
providing a variable speed compression device; and
selectively varying an operating speed of the variable speed compression device in response to a sum of the respective temperature differentials between a sensed temperature and a related set point temperature associated with each respective zone of the plurality of temperature controlled zones.
4. A method for controlling the operation of a refrigerant vapor compression system as recited in claim 3 further comprising the step of determining a desired operating speed of the variable speed compression device by processing the respective temperature differentials through a PI controller with an anti-windup feature.
5. A method for controlling the operation of a refrigerant vapor compression system as recited in claim 3 wherein the PI controller includes an integral time tuning parameter that is a zone volume weighted average of a set of the respective integral time tuning parameters associated with each of the plurality of temperature controlled zones.
6. A method for controlling the operation of a refrigerant vapor compression system as recited in claim 1 wherein the step of selectively dividing the refrigerant mass flow amongst the plurality of temperature controlled zones comprises dividing the refrigerant mass flow amongst the plurality of temperature controlled zones selectively in response to a set point temperature associated with each respective zone of the plurality of temperature controlled zones.
7. A method for controlling the operation of a refrigerant vapor compression system as recited in claim 6 wherein the temperature controlled zone having the lowest set point temperature is designated to receive a largest portion of the refrigerant mass flow.
8. A method for controlling the operation of a refrigerant vapor compression system as recited in claim 6 wherein one of the temperature controlled zone having the lowest set point temperature is manually designated to receive a largest portion of the refrigerant mass flow.
9. A refrigeration system comprising:
a cargo space having a plurality of temperature controlled zones;
a refrigerant vapor compression system having a refrigerant circuit including a compression device for circulating a refrigerant mass flow through the refrigerant circuit, and a plurality of evaporators with at least one evaporator associated with each one of the plurality of temperature controlled zones a first evaporator through which a flow of air circulated from the associated one of the plurality of temperature controlled zones is passed in heat exchange relationship with a portion of the refrigerant mass flow, and a plurality of liquid flow control valves with one liquid flow control valve disposed the refrigerant circuit in operative association with each of the plurality of evaporators for regulating the flow of refrigerant therethrough; and
a system control for controlling the refrigerant mass flow output of the compression device to provide a cooling capacity of the refrigerant vapor compression system in response to a collective cooling demand for the plurality of temperature controlled zones and for selectively dividing the refrigerant mass flow amongst the plurality of temperature controlled zones.
10. A transport refrigeration system comprising:
a cargo space having a first compartment defining a first temperature controlled zone and a second compartment defining a second temperature controlled zone;
a refrigerant vapor compression system having a refrigerant circuit including a variable capacity compression device for circulating a refrigerant mass flow through the refrigerant circuit, a first evaporator through which a flow of air circulated from the first temperature controlled zone is passed in heat exchange relationship with a first portion of the refrigerant mass flow, a second evaporator through which a flow of air circulated from the second temperature controlled zone is passed in heat exchange relationship with a second portion of the refrigerant mass flow, a first liquid flow control valve disposed in the refrigerant circuit for regulating the flow of refrigerant through the first evaporator and a second liquid flow control valve disposed in the refrigerant circuit for regulating the flow of refrigerant through the second evaporator; and
a system control for controlling the refrigerant mass flow output of the compression device to provide a cooling capacity of the refrigerant vapor compression system in response to a collective cooling demand for the first and the second temperature controlled zones, and for selectively controlling the positioning of the first liquid flow control valve to control the mass flow of the first portion of the refrigerant mass flow passing to the first evaporator, and for selectively controlling the positioning of the second liquid flow control valve to control the mass flow of the second portion of the refrigerant mass flow passing to the second evaporator.
11. A transport refrigeration system as recited in claim 10 wherein the variable capacity compression device comprises a variable speed compressor.
12. A transport refrigeration system as recited in claim 10 further comprising:
a variable speed drive motor for driving the variable speed compressor at a desired operating speed; and
a variable frequency drive operatively associated with the system control and the variable speed motor for delivering electric current to the variable speed drive motor at a desired frequency in response to a frequency signal from the system control.
13. A transport refrigeration system as recited in claim 10 wherein each of the first and second liquid flow control valves comprises a two position solenoid valve having a fully open position and a fully closed position.
14. A transport refrigeration system as recited in claim 13 wherein each of the first and second solenoid valves may be pulse width modulated between the fully open position and the fully closed position.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A window regulator comprising:
a carrier plate to which a window glass is fixed;
a guide rail configured to guide movement of the carrier plate there along;
a housing provided at a first end of the guide rail;
a wire guide provided at a second end of the guide rail;
a drum housed in the housing;
a first wire, for raising the carrier plate, wound around the wire guide and having a first end thereof connected to the carrier plate and a second end thereof connected to the drum;
a second wire, for lowering the carrier plate, having a first end thereof connected to the carrier plate and a second end thereof connected to the drum; and
a drive part configured to rotationally drive the drum;
the guide rail including a rail main body part, an insert-through part provided at one end of the rail main body part and inserted into the housing, and a locking tab provided on the rail main body part;
the housing including a housing part housing the insert-through part, an engaging part engaging with a tip of the locking tab, and a guide part configured to guide the tip of the locking tab to the engaging part when the tip of the locking tab is brought into contact with the guide part, the locking tab angled away from the rail main body part and toward the engaging part; and
the engagement of the locking tab and the engaging part restricting movement of the housing in a longitudinal direction of the guide rail toward the second end of the guide rail.
2. A window regulator according to claim 1, wherein
the guide part is angled toward the engaging part so as to slidably guide the tip of the locking tab to the engaging part.
3. A window regulator according to claim 2, wherein
the locking tab is a portion of the rail main body part that is bent relative to the rail main body part such that the locking tab protrudes from the rail main body part.
4. A window regulator according to claim 3, wherein
the guide part urges the locking tab away from the rail main body part as the guide part guides the locking tab to the engaging part.