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'HW'.-i-iTT.TIffl- Wheels NORTHWEST HERALD Section C Friday, September 1JLIMS Pw 3 J¥isg£*nf Computers improve Buick brakes Volkswogen TOYOTA FLINT, Mich. - Buick Motor Division, an industry leader in * a p p l i c a t i o n s o f • ; automotive electronics >.;• and braking systems, v will offer a computer- > controlled Anti-lock Z . ^ r a k i n g S y s t e m (ABS) as an option on the 1986 Buick Electra, I Park Avenue, and Electra T Type, v: Developed in con- junction with Alfred T e v e s C o r p . V, (Frankfurt, Federal Republic of Germany) v ABS is designed to pro- t vide controlled brak- t ing under all operating i-Z conditions. "The ABS system monitors wheel speeds at each wheel," ex­ p l a i n e d D a v i d S . Sharpe, Buick chief engineer. "If, during braking, those speeds differ from predeter­ mined limits, in­ dicating onset of lock­ ing, the computer automatically adjusts hydraulic pressure to each brake. The result is maximum braking, with control, on all kinds of road sur­ faces." The system will not, be noticeable under normal dirving condi­ tions, Sharpe said. On­ l y w h e n t h e A B S system^ senses the onset of a locking wheel will the driver feel a slight pulsation of the brake pedal under his foot. ABS replaces the n o r m a l v a c u u m booster with an elec- t r i e p u m ^ a n d hydraulic booster. Pressure is stored in an accumulator to sup­ ply the system during normal braking as well as in the anti-lock mode. During anti­ shock braking, seven solenoid valves control the supply of pressure to each wheel. Each front wheel can be con­ trolled independently; the two rear wheels a r e c o n t r o l l e d together, although either can signal the need for anti-lock braking. # The electronic con­ trol module for the ABS system contains t w o4 K m i c r o p r o c e s s o r s which calculate wheel speed and accelera­ tion/deceleration. The microprocessors also monitor the integrity of the system: supply pressure, fluid level, speed sensor integrity, and solenoid valve in- CAMS tegrity. As sensor signals are received from the four wheels, the elec­ t r o n i c c o n t r o l l e r calculates values for v e h i c l e s p e e d a n d compares them to the w h e e l s p e e d s a n d other predetermined criteria. It produces command signals for the solenoids to use in maintaining exactly the proper amount of hydraulic pressure, On any road surface, e x t r e m e b r a k i n g pressure (such as a "panic stop") without ABS could cause a f o u r - w h e e l s k i d . Because the tires are sliding, steering abili­ ty is lost. This condi­ tion is eliminated with ABS. Each time ABS is us­ ed, it learns to brake p r o p e r l y " f o r t h a t specific incident by reading the way the tire reacts to the road surface within the first f e w m i l l e s e c o n d s . These data are used by the system to optimize brake pressure during the stop for maximum control. A B S c o n t a i n s several built-in system monitors to watch for BRAKES -- Page 5C (Continued from Page 1C) One BIG tire ^Bridgestone Company, a lead- • ing Japanese tire maker, an- - nounced this week in Tokyo it yhas developed the world's big- *. gest tire to fit ultra-large shovel UPI photo i * .* * dozers to be lied for coal mines in Australia and other coun­ tries. The tire is 11% feet in diameter, 5% feet wide, and weights six tons. the car's battery and to the Assembly Line D i a g n o s t i c L i n k (ALDL) under the c a r ' s i n s t r u m e n t , panel. (Every Buick built since 1981 is e q u i p p e d w i t h a n ALDL, an end-of- assembly-line check for electrical com­ ponents.) All of the customer-reported driveability symptoms a r e e n t e r e d i n t o CAMS, which then automatically per­ forms tests of the elec­ tronic control module, and analyzes input data provided to the E C M f r o m t h e transmission, air con­ ditioner, and engine. The CAMS terminal t h e n p e r f o r m s a logical fault analysis of the systems. " W h e r e e x i s t i n g 'diagnostic' systems will provide a variety of electrical readings, CAMS takes the next logical step: it inter­ prets the readings and tells the technician how to correct faults, explained L.D. ROD-' bins, Buick's assistant general sales manager - service. For example, CAMS w i l l d i s p l a y a schematic diagram of the circuit needing at­ tention, a description of the precise problem, then a step-by-step procedure for repair or adjustment. When the technician has made the correction,} CAMS follows a pro­ gram which performs an immediate check to be certain no addi­ tional service action is necessary. The CAMS program includes a complete "Instruction Menu" featuring a "HELP" function which can provide the technician with specific addi­ tional information and assistance at any step in the repair pro­ cedure: In addition to the s o p h i s t i c a t e d diagnostic capability, a major feature which makes CAMS truly a state-of-the art service system is its com- m u n i c a t i o n s capabilities -- in­ cluding complete up- to-date information on new developments and f a c t o r y p T r o d u c t c h a n g e s , n e w diagnostic and repair techniques, and the l a t e s t v e h i c l e specifications, service manual information, and service bulletin summaries. T h e c o n s t a n t l y - updated information is fed into the CAMS dealership unit over­ night when the techni­ cian connects CAMS (through a standard telephone jack) to the CAMS host system at Buick headquarters. In the same com­ munications process, all the information fed into CAMS that day by the dealership service technician is transmit­ ted to the main com-, puter in Flint. The f o l l o w i n g m o r n i n g designers, engineers, m a n u f a c t u r i n g engineers, and Buick's service department management can see exactly what kinds of service siutations have been encountered in the field. If a product or procedural change is needed at the fac­ tory to eliminate a pro­ blem, that information is available on a daily basis. "Buick will be using this as an 'early warn­ ing system,' "Bobbins said, "so we can res­ pond more quickly and minimize any inconve- n i e n c e t o B u i c k owners." 1985 YEAR END CLEARANCE ON ALL --TOYOTAS AND VOLKSWAGONS '2000 Rebate On198S SCIR0CC0S! USED CAR SPECIALS 1984 VW RABBIT Diesel '6395 „ t 1981 TOYOTA TERCEL 4 Spd. '2995 1910 FORD FIESTA $/R.4Spd. *1995 1979 PEUGEOT 604 V-6, A/C, Auto. _ '2995 2 1 1979 TOYOTA UNO-CRUISER 7,000 Cert. Mil** l4695 Volkswogen TOYOTA (815) 459-7100 IN CRYSTAL LAKE RT 14 JUST WEST OF ROUTE 31 11,483 c:iL 20 TOYOTAS TO CHOOSE FROM! You won't see prices like this a EASE A LEASE A 1985 SUBARU GL 4 WD WAGON per month Payment 60 Month Lease 1st Month Payment $200 Security Deposit + License Title Fees CTueat Delivery Date. MIDGET '82 REGAL $639S°°