Browse Topic: Defoggers

Items (29)

Parametric Modelling and Performance Analysis of HVAC Defroster Duct Using Robust Optimization Methodology

2020-01-125004/14/2020

Thermal comfort and safety of automotive passengers are the most important factors in the development of the automotive HVAC system. HVAC system is responsible for the demisting and defrosting of the vehicle’s windows and for creating/maintaining a pleasant environment inside the cabin by controlling airflow and temperature. Fog or ice which forms on the windshield is the main reason for invisibility and leads to major safety issue to the customers while driving. It has been shown that proper clear visibility for the windshield could be obtained with a better flow pattern and uniform flow distribution in the defrost mode of the HVAC system and defrost duct. Defroster performance has received significant attention from OEMs to meet the specific global performance standards of FMVSS103 and SAE J902. Therefore, defroster performance is seriously taken into consideration during the design of HVAC system and defroster duct. The HVAC unit provides hot air to the defroster duct which is

Khan, Mohsin, Khan, Mohsin, Valencia, Manuel, Garikipati, Nagababu, Garikipati, Nagababu, Marginean, Calin

Passenger Vehicle Windshield Demisting and Defrosting Systems

J902_201909 (Current)09/25/2019

This SAE Recommend Practice establishes for passenger cars, light trucks, and multipurpose vehicles with GVW of 4500 kg (10000 pounds) or less, as defined by EPA, and M1 category vehicles as defined by the European Commission:

Interior Climate Control Vehicle OEM Committee

Effects of the Glass and Body Heat Transfer Characteristics of an Electric Vehicle on its Energy Consumption and Cruising Distance

2016-01-026004/05/2016

In order to develop various parts and components of electric vehicles, understanding the effects of their structures and thermal performance on the energy consumption and cruising distance is important. However, such essential and detailed information is generally not always available to suppliers of vehicle parts and components. This paper presents the development of a simple model of the energy consumption by an electric vehicle in order to roughly calculate the cruising performance based only on the published information to give to suppliers, who otherwise cannot obtain the necessary information. The method can calculate the cruising distance within an error of 4% compared to the published information. The effects of the glass and body heat transfer characteristics on the cruising performance in winter were considered as an example application of the proposed model. An anti-fog control method was modeled, where the relative humidity around the front windshield was assumed to be

Ozeki, Yoshiichi, Nagano, Hideaki, Kohri, Itsuhei

Smart Rear Defog

2013-01-151004/08/2013

Smart Rear Defog can be defined as an optimized control algorithm that sets the state of a vehicle's rear defog relay based on a logical assessment of vehicle parameters and environmental conditions. The use of the optimized control algorithm will minimize the amount of user interaction needed to operate the rear defogger and it will minimize the amount of heat rejected to the environment which in turn will improve the vehicle's real world fuel economy or electric range. This paper provides a detailed description of the smart rear defog control system as well as evidence to demonstrate its robustness to variances in environmental conditions and vehicle usage compared to the traditional rear defog system commonly used in many vehicles today.

Delorme, Gilles

Effects of Fretting Corrosion on Lift Glass

2011-01-143404/12/2011

The electrical architecture design of a rear back glass defrost grid system encompasses many critical criteria that must be integrated into the design. For example, the defrost clip location and interface to the glass must meet all vehicle performance requirements. If the defrost clip to the glass interface is not resistant to vibration and relative movement, detachment and loss of function can occur. This paper describes a back glass defrost clip with a solder joint that is robust to manufacturing variations and customer usage conditions. A designed experiment using Design for Six Sigma methodologies was performed to understand the effects of the attachment interface to the electrical wiring pigtail, and parameters that affect performance. The working constraints, testing set up, validation, and root cause investigation of the clip detachment phenomenon is covered in this paper.

Pyszel, Richard

Commission Regulation (EU) No. 672/2010 of July 27, 2010 Concerning Type-Approval Requirements for Windscreen Defrosting and Demisting Systems of Certain Motor Vehicles and Implementing Regulation (EC) No. 661/2009 of the European Parliament and of the Council Concerning Type-Approval Requirements for the General Safety of Motor Vehicles, their Trailers and Systems, Components and Separate Technical Units Intended therefor.

INT-REG-16211/24/2010

Defrosting and Demisting Systems.

Development of an Automatic Windshield Defogging System

2009-01-017304/20/2009

The development of an automatic defogging system using an accurate windshield humidity sensor and the existing HVAC hardware is described herein. Improved cabin temperature control and forward visibility for the driver was achieved using a sophisticated automatic defogging strategy integrated into the Automatic Temperature Control microprocessor. Laboratory tests were conducted under various weather conditions and test modes using a climate wind tunnel and field tests were conducted in North America The automatic defogging system worked well in all cases

Kwon, Choon-Gyu, Jang, Ki-Lyong, Lee, Chang-Won, Jung, Seung-Gyoon, Foster, Lee

Development of Next Generation Automatic Climate Control

2007-01-118804/16/2007

The majority of today's Automatic Climate Control (ACC) systems are based on linear analog controller technology which was developed in the mid of last century. In cognizance of the state of the ACC technology, we developed a new ACC system based on the concepts of power balance and the separation of transient and steady state control. Production implementations have demonstrated that the new ACC system technology improves overall control performance, and reduces program development time and the associated cost.

Wang, Mingyu, Pawlak, John L., Archibald, Charles A.

Passenger Car Windshield Defrosting Systems

J902_200307 (Historical)07/09/2003

This SAE Recommended Practice provides a test procedure and performance guideline for evaluating passenger vehicle windshield defrosting systems. It is limited to results of tests that can be conducted on uniform test equipment in commercially available laboratory facilities. The current engineering practice prescribes that for laboratory evaluation of defroster systems, a known quantity of water shall be sprayed on the windshield to form an ice coating and then melted by the defroster under specific vehicle operating conditions. The procedure provides uniform and repeatable laboratory test results, even though under actual conditions such a coating would be removed by scraping before driving the vehicle. The performance obtained, therefore, does not directly relate to actual driving conditions, but serves as a laboratory performance indicator for comparing test results within or between systems. This document is intended as a guide toward standard practice but may be subject to

Interior Climate Control Steering Committee

Investigations of Automotive Defroster and Windshield Flow

2001-01-344110/01/2001

The specification of automotive ventilation / defrosting systems has often utilized “trial-and-error” and “prior experience” techniques. But design development and production efficiency has generated a strong interest in using more sophisticated design tools such as computational fluid dynamics. For this purpose a joint experimental and numerical study was undertaken. This comprehensive investigation was divided into two parts. First, the three dimensional defroster flow field was measured using LDA in an actual automobile. Second, LDA and infrared thermography was used to map the flow and temperature fields for a two dimensional jet impinging upon a slanted plate -- a simplified representation of a car defroster geometry.

Becker, Stefan, Lienhart, Hermann, Stoots, Carl, Beier, Max, Hofhaus, Jörn, Schlenz, Dieter, Zemsch, Stefan, Ryssel, Edna

Windshield Defrosting Systems Performance Requirements--Trucks, Buses, and Multipurpose Vehicles

J382_200009 (Current)09/29/2000

This SAE Recommended Practice presents minimum defrosting system performance requirements for trucks, buses, and multipurpose vehicles when tested according to SAE J381. It is the intent that this document will be reviewed and revised to reflect technological progress in vehicle defroster systems.

Truck and Bus Windshield Wipers and Climate Control Comm

Passenger Car Windshield Defrosting Systems

J902_199902 (Historical)02/19/1999

This SAE Recommended Practice provides a test procedure and performance guideline for evaluating passenger car windshield defrosting systems. It is limited to results of tests that can be conducted on uniform test equipment in commercially available laboratory facilities. The current engineering practice prescribes that for laboratory evaluation of defroster systems, a known quantity of water shall be sprayed on the windshield to form an ice coating and then melted by the defroster under specific vehicle operating conditions. The procedure provides uniform and repeatable laboratory test results, even though under actual conditions such a coating would be removed by scraping before driving the vehicle. The performance obtained, therefore, does not directly relate to actual driving conditions, but serves as a laboratory performance indicator for comparing test results within or between systems. This document is intended as a guide toward standard practice but may be subject to frequent

Interior Climate Control Steering Committee

Passenger Car Backlight Defogging System

J953_199902 (Historical)02/01/1999

The scope of this SAE Recommended Practice is to establish uniform test procedures for passenger cars, to determine whether the system is defined as a defroster or defogger, and to establish minimum performance requirements for each system. A defroster for purposes of this practice is a system which will remove moisture and/or frost from the interior surface of the backlight at -18 °C. A defogger is a system which will remove moisture and/or fog from the interior surface of the backlight at 4 °C. The test procedure is intended to simulate actual conditions by utilizing either a cold room with an appropriate device to introduce air flow over the backlight or a sufficiently large wind tunnel with ambient temperature control. The test procedure and the minimum performance requirements are based on currently available engineering data.

Interior Climate Control Steering Committee

Motor Vehicle Heater Test Procedure

J638_199811 (Historical)11/05/1998

This SAE Recommended Practice, limited to liquid coolant systems, establishes uniform vehicle heater test procedures. Both laboratory and complete vehicle tests are specified in this document. Required test equipment, facilities, and definitions are included. NOTE—Defrosting and defogging procedures and requirements can be found in SAE J902, J381, J382, and J953.

Interior Climate Control Steering Committee

DAB Multiband Glass Antenna

98114402/23/1998

A new type of antenna, installed on the rear glass of a vehicle, to receive both Band III and L band was developed. This antenna consists of a rectangular loop, inductance elements inserted in the loop and a monopole connected to the edge of the loop. It works, through the use of the elements, both as a one-wavelength loop antenna for Band III and a half-wave dipole for L band. This antenna is (1) conformal and (2) compatible with the defogger heater grid lines. As the results of an open site test, this antenna had a higher gain than that of commercially- available whip-type multiband antennas for both bands.

Miyahara, Shunji, Shibata, Naoki

Windshield Defrosting Systems Performance Guidelines--Trucks, Buses, and Multi-Purpose Vehicles

J382_199406 (Historical)06/01/1994

Truck and Bus Windshield Wipers and Climate Control Comm

Optimum Design of Defroster Nozzle

92016702/01/1992

Time-consuming experiments have heretofore been required for the development of defroster nozzles. To solve this problem, the authors have quantitatively correlated configuration factors for defroster nozzles and air flow distribution through experiments with simplified models and multiple-regression analysis. Using this approach, it has become possible to derive defrosting patterns from defroster nozzle configuration factors in the design phase.

Kohnotou, Takashi, Iwamoto, Yoshiaki, Hoshiawa, Kiyohito, Nagataki, Masanori

Fuel-Fired Heaters-Air Heating-For Construction and Industrial Machinery

J1024_198912 (Historical)12/01/1989

This standard covers off-road, self-propelled work machines as categorized in SAE J1116. This standard outlines requirements that must be met in order for the heating equipment to perform satisfactorily on construction and industrial machinery. This standard describes a general set of parameters covering fuel-fired heaters for heating and defrosting cabs on construction and industrial machinery.

CTTC C4, Cold Weather Operation

Fuel-Fired Heaters - Air Heating - for Construction and Industrial Machinery

J1024_198905 (Historical)05/01/1989

Common Tests Technical Steering Committee

Windshield Defrosting Systems Performance Requirements--Trucks, Buses, and Multipurpose Vehicles

J382_198410 (Historical)10/01/1984

Truck and Bus Windshield Wipers and Climate Control Comm

Passenger Car Windshield Demisting and Defrosting Systems

J902_198410 (Historical)10/01/1984

Interior Climate Control Vehicle OEM Committee

Passenger Car Backlight Defogging System

J953_198406 (Historical)06/01/1984

Interior Climate Control Steering Committee

Motor Vehicle Heater Test Procedure

J638_198206 (Historical)06/01/1982

This SAE Recommended Practice, limited to liquid coolant systems, establishes uniform vehicle heater test procedures. Both laboratory and complete vehicle tests are specified in this document. Required test equipment, facilities, and definitions are included. NOTE - Defrosting and defogging procedures and requirements can be found in SAE J902, J381, J382, and J953.

Interior Climate Control Steering Committee

Windshield Defrosting Systems Performance Requirements--Trucks, Buses, and Multipurpose Vehicles

J382_197101 (Historical)01/01/1971

Truck and Bus Windshield Wipers and Climate Control Comm

Passenger Car Windshield Demisting and Defrosting Systems

J902A_196706 (Historical)06/01/1967

This SAE Recommend Practice establishes for passenger cars, light trucks, and multipurpose vehicles with GVW of 4500 kg (10 000 lb) or less, as defined by EPA, and M1 category vehicles as defined by the European Commission: a. Minimum performance standards for defrosting and demisting systems. b. Test procedures that can be conducted on uniform test equipment by commercially available laboratory facilities.

Interior Climate Control Vehicle OEM Committee

Passenger Car Windshield Demisting and Defrosting Systems

J902A_196703 (Historical)03/01/1967

Interior Climate Control Vehicle OEM Committee

Passenger Car Backlight Defogging System

J953_196605 (Historical)05/01/1966

Interior Climate Control Steering Committee

Passenger Car Windshield Demisting and Defrosting Systems

J902_196408 (Historical)08/01/1964

Interior Climate Control Vehicle OEM Committee

PRACTICAL APPROACHES TO COLD WEATHER TESTING

58020701/01/1958

The difficulties of outdoor testing for performance of engines, heaters, defrosters, fuel-induction systems and other automotive components are discussed, with illustrations from a typical winter expedition. How these problems are overcome by cold room testing, and practical procedures for reproducing natural problems in the laboratories are outlined. Necessary precautions and specialized equipment are treated with examples from Ford's cold room laboratories.

Runyon, Carl C.

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