Vehicle microclimate system and method of controlling same

A vehicle microclimate system includes a microclimate device that is configured to be arranged within an interior space that provides a macroclimate environment to an occupant. The microclimate device is configured to provide a microclimate environment to the occupant. The microclimate device is configured to be in close proximity to a region of the occupant having an increased thermoreceptive response compared to other occupant regions exposed to the macroclimate environment. A controller is in communication with the microclimate device. The controller is configured to determine an occupant personal comfort and automatically command the microclimate device in response to the occupant personal comfort to achieve a desired occupant personal comfort.

BACKGROUND

This disclosure relates to temperature control of a vehicle interior environment, such as within an automobile. More specifically, the disclosure relates to a vehicle microclimate system and a method for controlling the same for increasing an occupant's personal comfort.

Heating, ventilation and cooling (HVAC) systems are widely used in the automobile industry to control the temperature within the vehicle to increase occupant comfort. Increasingly, vehicles have incorporated additional, auxiliary thermal conditioning devices, such as heated and cooled seats and heated steering wheels. These auxiliary thermal conditioning devices are intended to further enhance occupant comfort.

The operation of the HVAC system and auxiliary thermal conditioning devices has not been coordinated. Each device within the vehicle is typically controlled independently based upon inputs from the occupant, such as by actuating switches and dials. Additionally, there has been no thermal conditioning system that addresses individual perception of thermal comfort, referred to herein as “occupant personal comfort,” which can vary dramatically between different occupants. Moreover, even when an occupant stops adjusting inputs because the occupant believes thermal comfort finally has been achieved, changing thermal loads on the vehicle may upset occupant thermal comfort, requiring more inputs from the occupant.

SUMMARY

In one exemplary embodiment, a vehicle microclimate system includes a microclimate device that is configured to be arranged within an interior space that provides a macroclimate environment to an occupant. The microclimate device is configured to provide a microclimate environment to the occupant. The microclimate device is configured to be in close proximity to a region of the occupant having an increased thermoreceptive response compared to other occupant regions exposed to the macroclimate environment. A controller is in communication with the microclimate device. The controller is configured to determine an occupant personal comfort and automatically command the microclimate device in response to the occupant personal comfort to achieve a desired occupant personal comfort.

In a further embodiment of any of the above, a HVAC thermal conditioning system is configured to provide the macroclimate environment.

In a further embodiment of any of the above, the vehicle microclimate system has at least one of an internal combustion engine, an electric motor system and a fuel cell. The HVAC thermal conditioning system is driven by the at least one of the internal combustion engine, the electric motor system and the fuel cell.

In a further embodiment of any of the above, there is an auxiliary thermal conditioning system that has multiple microclimate devices. The multiple microclimate devices provided by at least one of a steering wheel, a seat, a door panel, an armrest, a window defogger, a dash panel and a roof panel.

In a further embodiment of any of the above, the region of the occupant includes at least one of a hand, a foot, a neck, a face, a leg, an arm, a head and a torso.

In a further embodiment of any of the above, the controller includes a memory that has occupant characteristics providing a user profile that corresponds to the occupant. The controller is configured to use the user profile for determining the occupant personal comfort.

In a further embodiment of any of the above, the occupant characteristics include at least one of gender, height, weight and occupant-provided comfort data.

In a further embodiment of any of the above, the memory includes at least one look-up table with a microclimate profile, the controller configured to modify the microclimate profile based upon at least one user input.

In a further embodiment of any of the above, an occupant comfort sensor is in communication with the controller. The occupant comfort sensor is configured to detect the occupant characteristics. The controller is configured to use the detected occupant characteristics for determining the occupant personal comfort.

In a further embodiment of any of the above, the occupant characteristics include at least one of occupant core temperature, occupant skin temperature, occupant skin moisture, macroclimate humidity, and macroclimate temperature.

In a further embodiment of any of the above, the controller is configured to adjust the command to the microclimate device in response to the user profile and a microclimate profile associated with the user profile.

In a further embodiment of any of the above, the controller is configured to evaluate a vehicle exterior environment outside of the interior space, evaluate the macroclimate environment and evaluate the microclimate environment to determine the occupant personal comfort.

In a further embodiment of any of the above, the controller is configured to command the macroclimate device in response to the user profile and the microclimate profile.

In a further embodiment of any of the above, the vehicle exterior environment corresponds to the outside parameters including at least one of vehicle location, time and weather conditions.

In a further embodiment of any of the above, the controller includes a drowsiness module configured to detect occupant drowsiness based upon a drowsiness parameter. The microclimate device is commanded in response the drowsiness parameter.

In a further embodiment of any of the above, the controller includes a solar load module configured to detect a solar load on the vehicle based upon a solar load parameter. The microclimate device is commanded in response the solar load parameter.

In a further embodiment of any of the above, the controller includes a surface temperature sensitivity module that is configured to detect occupant surface temperature sensitivity based upon a surface temperature sensitivity parameter. The microclimate device is commanded in response to the surface temperature sensitivity parameter.

In a further embodiment of any of the above, the controller includes a baby seat module configured to detect an occupant baby seat based upon a baby seat parameter, the microclimate device commanded in response the baby seat parameter.

In a further embodiment of any of the above, the controller includes a remote start module configured to detect remote start input based upon a remote start input parameter. The microclimate device is commanded in response the remote start input parameter.

In a further embodiment of any of the above, the controller includes a climate conditioning transition module configured to detect a desired climate conditioning transition based upon a climate conditioning transition parameter. The microclimate device is commanded in response the climate conditioning transition parameter.

In another exemplary embodiment, a vehicle microclimate system includes a microclimate device that is configured to be arranged within an interior space that provides a macroclimate environment to an occupant. The microclimate device is configured to provide a microclimate environment to the occupant. A controller is in communication with the microclimate device. The controller is configured to determine a solar load and an occupant personal comfort. The controller is configured to automatically command the microclimate device in response to the solar load and the occupant personal comfort to achieve a desired occupant personal comfort.

In a further embodiment of any of the above, a HVAC thermal conditioning system is configured to provide the macroclimate environment.

In a further embodiment of any of the above, there is an auxiliary thermal conditioning system that has multiple microclimate devices. The multiple microclimate devices provided by at least one of a steering wheel, a seat, a door panel, an armrest, a window defogger, a dash panel and a roof panel.

In a further embodiment of any of the above, the controller includes a memory that has occupant characteristics providing a user profile that corresponds to the occupant. The controller is configured to use the user profile for determining the occupant personal comfort.

In a further embodiment of any of the above, the occupant characteristics include at least one of gender, height, weight and occupant-provided comfort data.

In a further embodiment of any of the above, the memory includes at least one look-up table with a microclimate profile, the controller configured to modify the microclimate profile based upon at least one user input.

In a further embodiment of any of the above, an occupant comfort sensor is in communication with the controller. The occupant comfort sensor is configured to detect the occupant characteristics. The controller is configured to use the detected occupant characteristics for determining the occupant personal comfort.

In a further embodiment of any of the above, the occupant characteristics include at least one of occupant core temperature, occupant skin temperature, occupant skin moisture, macroclimate humidity, and macroclimate temperature.

In a further embodiment of any of the above, the controller is configured to adjust the command to the microclimate device in response to the user profile and a microclimate profile associated with the user profile.

In a further embodiment of any of the above, the controller is configured to evaluate a vehicle exterior environment outside of the interior space, evaluate the macroclimate environment and evaluate the microclimate environment to determine the occupant personal comfort.

In a further embodiment of any of the above, the vehicle exterior environment corresponds to outside parameters including at least one of vehicle location, time and weather conditions.

In a further embodiment of any of the above, the controller is configured to determine the solar load based upon at least one of vehicle location, vehicle direction of travel, detected light intensity and sun location.

In another exemplary embodiment, a vehicle microclimate system includes a microclimate device configured to be arranged within an interior space that provides a macroclimate environment to an occupant. The microclimate device is configured to provide a microclimate environment to the occupant. A controller is in communication with the microclimate device. The controller is configured to detect a desired climate conditioning transition based upon a climate conditioning transition parameter and determine an occupant personal comfort. The microclimate device commanded in response the climate conditioning transition parameter and the occupant personal comfort to achieve a desired occupant personal comfort.

In a further embodiment of any of the above, the climate conditioning transition includes heating, cooling and neutral modes. The heating mode corresponds to a condition in which more heat is desired by the occupant. The cooling mode corresponds to another condition in which more cooling is desired by the occupant. The neutral mode corresponds to still another condition in which the current thermal environment is comfortable to the occupant. The controller is configured to automatically command in the neutral mode at least one of the microclimate device and a macroclimate device to achieve the desired occupant personal comfort.

In a further embodiment of any of the above, a HVAC thermal conditioning system is configured to provide the macroclimate environment.

In a further embodiment of any of the above, an auxiliary thermal conditioning system has multiple microclimate devices. The multiple microclimate devices provided by at least one of a steering wheel, a seat, a door panel, an armrest, a window defogger, a dash panel and a roof panel.

In a further embodiment of any of the above, the controller includes a memory that has occupant characteristics that provide a user profile that corresponds to the occupant. The controller is configured to use the user profile for determining the occupant personal comfort.

In a further embodiment of any of the above, the occupant characteristics include at least one of gender, height, weight and occupant-provided comfort data.

In a further embodiment of any of the above, the memory includes at least one look-up table with a microclimate profile. The controller is configured to modify the microclimate profile based upon at least one user input.

In a further embodiment of any of the above, an occupant comfort sensor is in communication with the controller. The occupant comfort sensor is configured to detect the occupant characteristics. The controller is configured to use the detected occupant characteristics for determining the occupant personal comfort.

In a further embodiment of any of the above, the occupant characteristics include at least one of occupant core temperature, occupant skin temperature, occupant skin moisture, macroclimate humidity, and macroclimate temperature.

In a further embodiment of any of the above, the controller is configured to evaluate a vehicle exterior environment outside of the interior space, evaluate the macroclimate environment and evaluate the microclimate environment to determine the occupant personal comfort.

In a further embodiment of any of the above, the vehicle exterior environment corresponds to outside parameters including at least one of vehicle location, time and weather conditions.

DETAILED DESCRIPTION

A vehicle10, such as an automobile, is schematically shown inFIG. 1. The vehicle10includes a cabin or an interior space12for one or more occupants16that provides a vehicle interior environment in which the occupant experiences thermal comfort. The vehicle10is arranged in a vehicle exterior environment14, which also can affect the thermal comfort of the interior space12, introducing a thermal energy imbalance in the vehicle's interior space.

Each occupant typically has a unique occupant personal comfort. That is, a particular occupant detects a level of thermal energy differently than another occupant. As a result, the exact same thermal environment within a vehicle may be perceived as comfortable by one occupant, but as uncomfortable by another occupant. To this end, this disclosure relates to providing an integrated approach to human thermal management by controlling and coordinating both macroclimate devices (e.g., central HVAC system) and microclimate devices (e.g., climate controlled seats (e.g., U.S. Pat. Nos. 5,524,439 and 6,857,697), head rest/neck conditioner (e.g., U.S. Provisional App. No. 62/039,125), climate controlled headliner (e.g., U.S. Provisional App. No. 61/900,334), steering wheel (e.g., U.S. Pat. No. 6,727,467 and U.S. Pub. No. 2014/0090513), heated gear shifter (e.g., U.S. Pub. No. 2013/0061603, etc.) to achieve a personalized microclimate system. The microclimate system provides desired occupant personal comfort in a more automated manner with little or no input from the occupant. It should be understood that microclimate devices alone (i.e. without a macroclimate device) can provide both a macroclimate and a personalized microclimate within the macroclimate. The referenced patents, publications and applications are incorporated herein by reference in their entirety.

In one example, the vehicle10includes an HVAC thermal conditioning system18and an auxiliary thermal conditioning system20(with microclimate devices), which are in communication with a controller22. Various inputs24may communicate with the controller22to affect and control operation of the HVAC thermal conditioning system18and/or the auxiliary thermal conditioning system20.

In one example microclimate system, the controller22receives various inputs via sensors and/or devices within the microclimate system, for example, from a vehicle exterior environment26shown inFIG. 2. The vehicle exterior environment26may include parameters such as vehicle location, vehicle direction and altitude, time of day and date, and weather related parameters (outdoor temperature, outdoor humidity, and solar load on the vehicle).

A microclimate environment30communicates parameters to the controller22. The microclimate environment parameters may include temperature and/or humidity at one or more microclimate devices, auxiliary conditioning system settings, and occupant comfort feedback. Occupant comfort feedback may be provided when the occupant provides an input to control one of the microclimate devices, such as by changing the position of a switch.

Occupant information32is provided to the controller22for customizing and accounting for thermoreceptive differences between various occupants. It has been shown, for example, that women and men, generally speaking, react to heat and cold differently, with women reacting more severely and more quickly to cold and men reacting more quickly to heat. Additionally, the occupant information32can provide information for determining a thermal mass, heat capacity, and internal energy production rate. Occupant information32includes such information as gender, height, weight, and other occupant-provided data to provide a user profile. Then, for example, an initial default data set, or microclimate profile, could be defined during the customer vehicle purchase process, prior to any data being collected. Then based on the default microclimate profile the system can begin the process of intuitively collecting data and then adjusting to individual's needs/wants based on the actual inputs by and use from the user over time. This initial microclimate profile could be based on any number of factors, including quantitative factors such as initial purchase location, driver characteristics (sex, height, weight, etc.), as well as qualitative factors, such as a survey where the respondent answers questions about their normal state of thermal comfort/stress. This information can be stored on a key fob or mobile device that is communicated to the controller22. The user profile and learned microclimate profile can “move” with the occupant via the vehicle data link, the cloud, wireless transmission and/or smartphone, for example.

Sensed occupant information may also be provided (see, e.g., sensor79inFIG. 3), for example, by detecting occupant temperature. These sensed occupant personal comfort inputs are provided to the controller22for determining a perceived occupant personal comfort. The inputs can include one or more measured physiological parameters such as skin or other body temperatures such as a body core temperature.

Multiple parameters from the vehicle exterior environment26, the macroclimate environment28, the microclimate environment30, and the occupant information32may be stored in memory, such as one or more look-up tables34. The memory may store information relating to one or more user profiles31and microclimate profiles33for various use scenarios corresponding to a particular user. The controller22may learn from adjustments to the microclimate system made by the occupant and update the microclimate profile33in the look-up tables34so that the occupant personal comfort may be anticipated and the microclimate system adjusted automatically. Interpolation of look-up table values or another suitable method can be used to determine settings between pre-existing set-points.

Referring inFIG. 3, an example HVAC thermal conditioning system18is in communication with the controller22. The HVAC thermal conditioning system18includes a heat exchanger36in fluid communication with a heating loop connected to an engine42. The engine42may include an internal combustion engine, an electric motor system, and/or a fuel cell. The engine42provides a heat source for the HVAC thermal conditioning system18. An evaporator40is arranged in a cooling loop, which may include refrigerant and conventional air conditioning components typically found in a vehicle. It should be understood that a conventional HVAC system can instead be provided by one or more electrically operated microcompressors, if desired. A ventilation system38, which provides fresh air to the HVAC system, may also be provided. The HVAC thermal conditioning system18typically includes ducting44providing multiple vents46. One or more valves48selectively control airflow from the HVAC system to the vents46. These HVAC system components provide the macroclimate environment.

The auxiliary thermal conditioning system20includes multiple microclimate devices, such as a window defroster/defogger50, a roof panel52, one or more panels58in an instrument panel54(which may include vents56), a door panel60, a door arm rest62, a center console armrest63, a seat64having thermal element66and a neck conditioning device67having a vent68, and/or a steering wheel70. These microclimate devices are intended to increase occupant comfort beyond what an HVAC system is capable by providing heating and/or cooling in close proximity to an occupant and thereby a more personalized microclimate environment within the surrounding interior environment. Heating and cooling can be provided by, for example, one or more heating elements, fans, thermoelectric devices, heat pumps, and/or microcompressors.

The inputs24are used to adjust the macroclimate environment and the microclimate environment through the controller22to achieve a desired occupant personal comfort. Inputs24include sensor signals and other inputs indicative of various parameters of the vehicle exterior environment26, the macroclimate environment28, and the microclimate environment30. Inputs24further include one or more switches72, a key fob74containing occupant information, a mobile device76containing occupant information and/or a display78. The display78may visually display outputs or operating modes of the HVAC thermal conditioning system18and/or the auxiliary thermal conditioning system20. The display74may also provide a means of input via a touchscreen, for example. A sensor79may provide real-time, sensed occupant information, such as temperature, moisture, humidity or other information.

Generally, the vehicle microclimate system includes at least one microclimate device configured to be arranged within the interior space of the vehicle. The interior space12provides a microclimate environment to the occupant16. The microclimate device is configured to provide a microclimate environment to the occupant16according to the user profile31and the microclimate profile33. In one example mode of operation, the microclimate device is configured to be in close proximity to a region of the occupant having an increased personal response compared to other occupant regions exposed to the macroclimate environment. These occupant regions may include at least one of a hand, a foot, a neck, a face, a leg, an arm, a head, and a torso.

The controller22is in communication with the microclimate device. The controller is configured to determine an occupant personal comfort, for example, based upon the occupant information30. The controller22commands the microclimate device in response to the occupant personal comfort to provide increased occupant comfort beyond what the HVAC system can provide, thereby fine-tuning the occupant's immediately surrounding environment. For example, a thermal energy input may unbalance the macroclimate environment, such as the sun shining intensely on the occupant's face for a prolonged period, which might cause the occupant's back to sweat. Anticipating this undesired condition, the controller22commands the seat to cool and thereby dehumidify the occupant's back, neck, and/or arms with the thermal elements66and/or neck conditioning device. Cooling the back can inhibit and/or remediate sweating in the back area and the associated discomfort such sweating can cause. Cooling one or both arms can lower skin temperature and counteract effects of the solar load on areas most exposed. In the foregoing manners, the auxiliary thermal conditioning system20can maintain a comfortable state by inhibiting and/or remediating sweating, which can be an additional source of discomfort.

The HVAC system is largely used to change the equilibrium point of the cabin environment, while the auxiliary thermal comfort system20manages the perception of comfort by the occupant. This may enable a reduction in HVAC system size since the thermal comfort of the occupant can be more directly manipulated by more targeted, localized devices. Furthermore, the effort of the two systems can be coordinated to limit the need for the occupant to intervene to change the control settings during operation. For example, when getting in a hot car, the air conditioning almost always begins at full power, leveling off to a lower value once the desired state is achieved. This could be managed quite easily without driver input.

The microclimate system and its controller can be designed using one or more methodologies. For example, an “open loop” methodology may be used wherein a particular model is implemented in a computing platform, which may or may not be in the vehicle. This model is then utilized to determine how occupant thermal comfort should be manipulated. The model may be populated using data from off-line testing and validation, and then the appropriate control effects would be created based on sensor input (e.g., humidity, external temperature, etc.).

A “closed loop” methodology may be used wherein a system (e.g., with an infrared camera being a part of the safety system as well as a humidity sensor) ascertains the condition of an occupant, such as a driver, and adjusts thermal conditions based on this information. For example, image processing techniques could determine that the driver is wearing a hat or that the driver is overheated due to exercise based on infrared (IR) imaging.

A “learning” methodology may be used where the closed loop or open loop methodology is modified over time based on the choices made by a particular occupant or set of occupants to adjust the microclimate profile33. For example, a vehicle may record the outside temperature, inside temperature, and humidity on the look-up tables34, and remember the thermal control settings chosen by the driver in these conditions, which could then be replicated (or interpolated) then next time that similar conditions are encountered. The longer that the driver uses the vehicle, the more information that is available, and the more “customized” the microclimate profile for the microclimate system will be to that particular individual. Furthermore, an excellent metric for the suitability of any set of parameters given a particular set of conditions would likely be how long the system is left in a particular state, that is, without an occupant adjusting any thermal settings.

FIG. 4illustrates an example control methodology of the microclimate system. In operation, the controller22includes a method80that identifies occupant characteristics, as indicated at block82, such as the occupant information32(FIG. 2) to provide the user profile31. This includes some level of occupant detection and personal identification, which can employ various vehicle systems. For example, many vehicles have “pre-sets” which identify the driver. Furthermore, weight sensors which detect the occupant's presence and can add another level of information used to identify the occupant. Interior visual systems (e.g., as a part of safety/airbag deployment, etc.) can greatly enhance the identification of a particular occupant. Bluetooth connected smartphones has also greatly simplified this task. Voice recognition or fingerprint identification may also be used. The presence of a particular device will provide driver (and in some cases passenger) identification with a high degree of certainty. This information can then be used to create the occupant's user profile31and the associated “thermal profile” data to produce the microclimate profile33used to implement the disclosed thermal management scheme. This information may then be stored on the phone or in the vehicle, allowing the transference of this information from one vehicle to another.

The controller22then determines occupant personal comfort, as indicated at block84. The occupant personal comfort may be determined based upon evaluating the vehicle exterior environment (block86;26inFIG. 2), evaluating the macroclimate environment (block88;28inFIG. 2), and/or evaluating the microclimate environment (block90;30inFIG. 2). Occupant personal comfort inputs may also be evaluated (block94;32inFIG. 2), for example, by using an infrared camera (e.g., sensor79inFIG. 3) to detect a body temperature or other condition of the occupant.

Once the occupant personal comfort has been determined, a microclimate device is commanded according to the microclimate profile33, as indicated at block92, to achieve a desired occupant personal comfort. Additionally, a macroclimate device may also be commanded, as indicated at block96, to further and more quickly achieve the desired occupant personal comfort. The occupant personal comfort may be reevaluated, as indicated at block98, by adjusting the microclimate profile33. This feedback may be provided by the occupant providing additional inputs via switches or other input devices, which indicates that the occupant is not yet comfortable, or by actively sensing the comfort of the occupant.

The controller22learns from the settings typically used by the occupant for a given set of conditions. The controller22also learns from adjustments to the settings during periods of automatic control when the microclimate system is operating according to an occupant's microclimate profile33associated with their user profile31. The seat heater, for example, could be turned to “high” for a preset amount of time, and then backed down as the occupant becomes more comfortable and the HVAC system sufficiently regulates the macroclimate environment. For a more complex example, a seat neck warmer could be triggered in order to vasodilate blood flow to the hands while coordinating the conditioning of the steering wheel to achieve maximum thermal comfort perception on the part of the driver. When the vehicle learns what a particular occupant likes, based on their not adjusting the thermal management system during operation, those same conditions can be replicated the next time that they occur.

Additionally, microclimate devices, such as the seat surfaces may be heated or cooled so that the occupant is comfortable. In one example, in a particularly hot vehicle interior, it is not enough to simply provide cooled air flow to the vehicle cabin. Seats, particularly vinyl or leather seats, may be hot or uncomfortable to the touch causing the occupant's back to sweat initially even when entering a cooled vehicle cabin. Rapidly heating or cooling the seat depending upon the condition enhances occupant thermal comfort.

The more degrees of freedom present for control, the more responsive the microclimate system can become to the occupant. The addition of humidity sensors in strategic locations, or the use of low power IR sensors to sense skin temperature (or a combination of both) could be used to directly manipulate the perception of thermal comfort. Furthermore, coordination with the HVAC system allows the vehicle microclimate system to possess a feed forward component, enabling the microclimate system to achieve a smooth transition from the dynamic state or environment (seat thermal elements on full power, HVAC system on full power) to a desired static/homeostatic state or environment. The transition can simultaneously manage a temperature transition within the interior12and an occupant thermal comfort transition.

The disclosed microclimate system enables many unique thermal comfort situations to be addressed more effectively in a vehicle. Several examples are illustrated inFIG. 5. The method80includes a system in which an occupant information module100and a vehicle environment module102communicate with the controller22, which generates occupant-specific microclimate profiles for use in setting the microclimate system at the occupant's specific location within the vehicle.

A climate conditioning transition module104includes algorithms that coordinate the operation of the HVAC thermal conditioning system18and the auxiliary thermal conditioning system20(examples of which are illustrated inFIGS. 6 and 7and discussed in more detail below). The climate conditioning transition module104may include an input that has heating, cooling and neutral modes. In the heating mode, the occupant indicates that more heat is desired, and, in the cooling mode, the occupant indicates that more cooling is desired. In the heating and cooling modes, the auxiliary thermal conditioning system20can operate in a dynamic state to transition operation towards or to a desired static/homeostatic state. The heating and cooling modes may override the automatic control provided by the microclimate system. In the neutral mode, the occupant has indicated that the current thermal environment is comfortable to the occupant. In this mode, the climate conditioning transition module104automatically adjust the HVAC thermal conditioning system18and/or the auxiliary thermal conditioning system20to maintain this comfortable thermal state for the particular occupant. The controller22can adjust the occupant's microclimate profiles in memory based on adjustments by the occupant during operation in a neutral mode.

A power management module106minimizes the power used by the HVAC thermal conditioning system18and the auxiliary thermal conditioning system20as much as possible, for example. Power management control features reduce compressor and/or alternator load on the engine by simultaneously adjusting or reducing HVAC system operation while adjusting or increasing power to certain auxiliary thermal conditioning system devices.

A driver drowsiness module108may detect when a driver is drowsy and command the HVAC system and/or microclimate devices to maintain alertness of the driver, for example, by rapidly cooling the steering wheel or blowing cold air on the feet or face of the occupant.

A baby seat module110controls the HVAC thermal conditioning system18and the auxiliary thermal conditioning system20in the area of a baby seat, which is detected by a seatbelt sensor, occupant weight sensor or other input device.

A surface temperature sensitivity module112controls the microclimate devices, for example, a seat, for occupants who may have particular temperature sensitivity, such as paraplegics. This ensures that the surface temperatures are controlled based upon the particular needs and desires of the occupant. Using Bluetooth as an identifying occupant reference could facilitate the identification of an occupant who is paraplegic, which would allow the microclimate system to disable the seat heater option, if desired. This would require some form of self-identification on the part of the paraplegic.

A remote start module114may control microclimate devices in a remote start condition. By identifying the key fob which triggers the remote start, the microclimate system would be able to precondition the vehicle based on the temperature and humidity inside the cabin, the temperature and humidity outside of the cabin, as well as the history of the individual driver, including occupant identification and profile, time of day, microclimate system settings at end of last key cycle. The remote start module114quickly adjusts the microclimate based on the HVAC system operation and surrounding interior environment to converge on desired comfort and avoid “overshooting” desired microclimate to the occupant.

A solar load module116accounts for the sometimes significant comfort impact of the sun on the occupant within the vehicle. In some situations, a brightly shining sun on an occupant may cause the occupant to sweat even though the temperature and humidity within the cabin remains steady and was previously comfortable to the occupant. The solar load module116accounts for this condition, which is more fully illustrated in connection with the example inFIGS. 6 and 7, discussed below.

The vehicle10and its interior space12are schematically illustrated inFIG. 6. The vehicle10is arranged within the vehicle exterior environment14. For illustrative purposes, the vehicle10includes the instrument panel54having vents56, the seat64and the steering wheel70. Of course, additional or different devices may be provided. The microclimate environment can be illustrated by the equations below.
TEocc=Σqr+Σqcv+ΣqcdEquation 1
TEocc=qr1+qr2+qcv1+qcv2+qcd1+qcd2Equation 2
TEocc=1.2qr1+0.8qr2+1.8qcv1+1.1qcv2+2.0qcd1+1.6qcd2Equation 3

Referring to Equation 1, TEoccis the thermal energy experienced by the occupant, qrcorresponds to the thermal radiation sources, qcvcorresponds to the thermal convection sources, and qcdcorresponds to the thermal conduction sources. Multiple thermal inputs are provided in Equation 2 for illustrative purposes. More or fewer thermal inputs may be used by the microclimate control system. In one example set forth in Equation 3 and shown inFIG. 6, qr1is a solar radiation source, qr2is a heat load from components within the vehicle such as an instrument panel, qcv1is airflow from a first vent, qcv2is airflow from a second vent, qcd1is cooling from a seat back, and qcd2is cooling from a steering wheel.

In operation, the controller22determines a solar load on the vehicle interior space12based on, for example, vehicle location, vehicle direction of travel, detected light intensity and the sun location to determine the impact on occupant personal comfort. In one example, the controller22determines a volume of the microclimate affected by the solar load (microclimate affected volume), and compensates for the solar load by adjusting (represented by the coefficients in Equation 3) at least one device within the microclimate affected volume, an example of which is graphically shown inFIG. 7.

During vehicle operation the solar load qr1may increase, upsetting occupant personal comfort. In response, the controller22automatically commands the HVAC system to direct cool airflow qcv1through the vent56onto the occupant16. The controller22also automatically commands the seat64to cool the back, qcd1, of the occupant16. The airflow from the vent56may be tapered off more quickly than the cooling from the seat64, because the controller22may have learned that directing airflow onto the occupant16is perceived as bothersome by this particular occupant.

It should be noted that a controller22can be used to implement the various functionality disclosed in this application. The controller22may include one or more discrete units. Moreover, a portion of the controller22may be provided in the vehicle10, while another portion of the controller22may be located elsewhere. In terms of hardware architecture, such a computing device can include a processor, memory, and one or more input and/or output (I/O) device interface(s) that are communicatively coupled via a local interface. The local interface can include, for example but not limited to, one or more buses and/or other wired or wireless connections. The local interface may have additional elements, which are omitted for simplicity, such as controllers, buffers (caches), drivers, repeaters, and receivers to enable communications. Further, the local interface may include address, control, and/or data connections to enable appropriate communications among the aforementioned components.

The controller22may be a hardware device for executing software, particularly software stored in memory. The controller22can be a custom made or commercially available processor, a central processing unit (CPU), an auxiliary processor among several processors associated with the controller, a semiconductor-based microprocessor (in the form of a microchip or chip set) or generally any device for executing software instructions.

The memory can include any one or combination of volatile memory elements (e.g., random access memory (RAM, such as DRAM, SRAM, SDRAM, VRAM, etc.)) and/or nonvolatile memory elements (e.g., ROM, hard drive, tape, CD-ROM, etc.). Moreover, the memory may incorporate electronic, magnetic, optical, and/or other types of storage media. The memory can also have a distributed architecture, where various components are situated remotely from one another, but can be accessed by the processor.

The software in the memory may include one or more separate programs, each of which includes an ordered listing of executable instructions for implementing logical functions. A system component embodied as software may also be construed as a source program, executable program (object code), script, or any other entity comprising a set of instructions to be performed. When constructed as a source program, the program is translated via a compiler, assembler, interpreter, or the like, which may or may not be included within the memory.

The disclosed input and output devices that may be coupled to system I/O interface(s) may include input devices, for example but not limited to, a keyboard, mouse, scanner, microphone, camera, mobile device, proximity device, etc. Further, the output devices, for example but not limited to, a printer, display, macroclimate device, microclimate device, etc. Finally, the input and output devices may further include devices that communicate both as inputs and outputs, for instance but not limited to, a modulator/demodulator (modem; for accessing another device, system, or network), a radio frequency (RF) or other transceiver, a telephonic interface, a bridge, a router, etc.

When the controller22is in operation, the processor can be configured to execute software stored within the memory, to communicate data to and from the memory, and to generally control operations of the computing device pursuant to the software. Software in memory, in whole or in part, is read by the processor, perhaps buffered within the processor, and then executed.