Methods and systems are provided for adjusting an amount of friction brake effort and an air conditioning compressor load to collect water for water injection into an engine. In one example, a method may include adjusting the AC compressor load of a mechanical air conditioning system and an amount of friction brake effort based on a water level in a water storage tank of the water injection system. Further, the method may include adjusting a ratio of the AC compressor load to friction brake effort to deliver a driver demanded brake effort.

The torque of a vehicular air-conditioning compressor is predicted by the steps of starting a vehicle air-conditioning system having an engine and engine control module for controlling multiple vehicle functions, calculating a steady state torque value using an rpm value from the engine, calculating an engine RPM transient torque value using the rpm value from the engine, calculating a electronic control valve current transient torque value using a current value applied to an electronic control valve, selecting a final torque value from a group consisting of the steady state torque value, the engine RPM transient torque value, and the electronic control valve transient torque value, and providing a final torque value to the vehicle engine control module to control a predetermined vehicle function.

Methods and systems are provided for adjusting an amount of friction brake effort and an air conditioning compressor load to collect water for water injection into an engine. In one example, a method may include adjusting the AC compressor load of a mechanical air conditioning system and an amount of friction brake effort based on a water level in a water storage tank of the water injection system. Further, the method may include adjusting a ratio of the AC compressor load to friction brake effort to deliver a driver demanded brake effort.

The various implementations described herein include methods, devices, and systems for starting-up a vehicle air-conditioning system. In one aspect, a method is performed at a vehicle air-conditioning system including a blower fan, a condenser fan, and a compressor electrically coupled to a battery system. The method includes: (1) starting the blower fan; (2) after starting the blower fan, measuring a first current drawn from the battery system, the first current indicative of current drawn by the blower fan; (3) in accordance with a determination that the first current meets predefined criteria, starting the condenser fan; (4) after starting the condenser fan, measuring a second current drawn from the battery system, where the difference between the second current and the first current is indicative of current drawn by the condenser fan; and (5) in accordance with a determination that the second current meets predefined second criteria, starting the compressor.

Disclosed are climate systems and methods for control the climate systems. A climate system includes a plurality of compressors arranged in parallel, a condenser disposed downstream of the compressors and an evaporator disposed downstream of the condenser. The compressors, the condenser, and the evaporator are fluidly connected by refrigerant lines to form a refrigerant circuit. The climate system also includes a controller that controls the operation of the compressors to draw back lubricant to the compressors without use of an oil equalization system.

A refrigeration unit and a method for controlling same during start-stop operation is provided. The refrigeration unit may include an engine operable between at least a low engine speed and a high engine speed, a compressor operatively coupled to the engine, and a controller operatively coupled to each of the engine and the compressor. The controller may be configured to operate the engine at a reduced low speed during a delay period, extend the delay period based on the reduced low speed, increase a displacement capacity of the compressor based on the extended delay period, and operate the engine at a reduced high speed.

A mobile hybrid electric temperature-controlled system connected to a vehicle, such as a vehicle-transported refrigeration system, includes a power management system and an energy storage module. The power management system and energy storage module can manage power delivered to the temperature-controlled system components by monitoring temperatures and voltages (and possibly other factors) and by delivering power as a function of the things monitored. In a typical implementation the power management system and an energy storage module can supply power to a vehicle-transported refrigeration system when the vehicle is stopped and/or power from the vehicle electrical system is electrically isolated or otherwise unavailable.

A system is provided that includes mode and battery modules. The mode module, based on parameters, determines whether to operate in a shore power, engine or battery mode. One or more batteries are charged based on received utility power while in the shore power mode. The batteries, while in the engine mode, are charged based on power received from a power source. The battery module, while operating in the battery mode, determines a speed based on a temperature within a temperature controlled container of a vehicle and a state of charge of the batteries. The compressor is run at the speed while in the battery mode. While in the battery mode, the batteries are not being charged based on power from a shore power source and the power source from which power is received during the engine mode.

A refrigeration system includes a startup mode control module that receives an off time of a compressor of the refrigeration system and an ambient temperature, determines whether the off time and the ambient temperature indicate that the compressor is in a flooded condition, and selects, based on the determination, between a normal startup mode and a flooded startup mode. A compressor control module operates the compressor in the normal startup mode in response to the startup mode control module selecting the normal startup mode, in the flooded startup mode in response to the startup mode control module selecting the flooded startup mode, and transitions from the flooded startup mode to the normal startup mode after a predetermined period associated with operating in the flooded startup mode. The compressor is operated at a first speed in the normal startup mode and at a second speed in the flooded startup mode.

While a speed of a first compressor during operation is less than a threshold speed, a speed of a second compressor during operation is prevented from falling below a minimum threshold speed that is defined by a sum of the speed of the first compressor and a predefined offset speed delta such that the minimum threshold speed changes as the speed of the first compressor changes.