Rapid heating, cooling and massaging for car seats using integrated shape memory alloy actuators and thermoelectric devices

Inactive Publication Date: 2005-11-17
MASSACHUSETTS INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0038] Hence, the invention is directed to a new approach to car seat design for alleviating long-drive fatigue. To enhance blood circulation as well as to keep the skin temperature and moisture at desired levels, an acti

Problems solved by technology

Long hours of driving cause the driver's tissue at the thighs and hips to be pressurized for an extended period and result in considerable discomfort and driver fatigue.
Capillary blood vessels may collapse under a pressure higher than 30 mmHg thereby interfering with blood perfusion and circulation when the driver is seated for a long time.
Furthermore, continuous contact with the seat surface often causes heat and moisture accumulation at the contact surface.
A driver who is driving for an extended period of time can be fatigued due to inadequate blood

Method used

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  • Rapid heating, cooling and massaging for car seats using integrated shape memory alloy actuators and thermoelectric devices
  • Rapid heating, cooling and massaging for car seats using integrated shape memory alloy actuators and thermoelectric devices
  • Rapid heating, cooling and massaging for car seats using integrated shape memory alloy actuators and thermoelectric devices

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Embodiment Construction

[0071]FIG. 1 contains a schematic diagram of an active seat surface 11 for altering pressure distribution on a person in accordance with an embodiment of the invention. As illustrated in the figure, the body of the user, illustrated by human tissue 10, is supported at different areas of contact, so that the pressurized tissue areas may be changed. The figure shows a wave pattern of crests and troughs that are altered periodically. Referring to the “before” and “after” views, the motion of the wave pattern of crests and troughs is observed.

[0072]FIG. 2 contains a schematic diagram of the active seat surface 11 of the invention shown in FIG. 1, illustrating propagating surface waves for removing hot, humid air. To remove heat and moisture at the contact area, the air gap between the crest and the trough is relatively large. Furthermore, if the wave propagates, as shown in FIG. 2, the air of high moisture and temperature that is captured between the human skin and the trough may be tr...

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PUM

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Abstract

An apparatus and method for providing controlled heating, cooling and motion, in a device such as an active robotic automobile seat, are disclosed. A shape memory alloy (SMA) element, which changes shape upon application of a temperature change to the SMA element, is coupled to a thermoelectric device. Heat flows through the TED upon application of an electrical current through the TED. The apparatus is operable in one of a plurality of modes. In a first mode, a current is applied through the TED to cause a temperature change in the SMA element to change the shape of the SMA element. In a second mode, a current is applied to the TED to cause heat flow in a space adjacent to the apparatus. By controlling application of current to the TED, controlled motion, heating and cooling are achieved in the seat.

Description

RELATED APPLICATION [0001] This application is based on U.S. Provisional Application Ser. No. 60 / 565,894, filed on Apr. 28, 2004, the contents of which are incorporated herein in their entirety by reference.BACKGROUND OF THE INVENTION [0002] Long hours of driving cause the driver's tissue at the thighs and hips to be pressurized for an extended period and result in considerable discomfort and driver fatigue. Capillary blood vessels may collapse under a pressure higher than 30 mmHg thereby interfering with blood perfusion and circulation when the driver is seated for a long time. Furthermore, continuous contact with the seat surface often causes heat and moisture accumulation at the contact surface. Periodically stimulating the tissue in contact with the car seat, as well as providing adequate ventilation and pressure relief may alleviate these problems. Automotive manufacturers are enhancing the value of luxury cars by adding more functionality to the car seats. [0003] These car sea...

Claims

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Application Information

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IPC IPC(8): A47C7/72B60N2/56B60N2/90
CPCB60N2/448B60N2/5621B60N2/5692B60N2/5685B60N2/5664B60N2/976B60Y2410/136
Inventor ASADA, H. HARRYCHO, KYU-JINROY, BINAYAK
Owner MASSACHUSETTS INST OF TECH
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