PeterUbers

iTrader: (1)

5-SPEED AUTOMATIC TRANSMISSION
To maximize the performance capabilities of both the 3.2 CL and Type S V-6 engines, an advanced 5-speed automatic transmission with a Sequential SportShift system was developed. Though the new engine commands a significant role in the new CL's improved performance, the new 5-speed automatic transmission figures heavily in measured performance gains and seat-of-the-pants driving feel.

The close ratio settings match the demands of varied driving situations while the new transmission's tall top gear ratio results in low cruising rpm's for reduced engine noise and lower fuel consumption.

Immediately noticeable from the driver's seat is a marked improvement in shift quality, relative to the four-speed automatic transmission in the 1999 CL. The new 5-speed transmission downshifts more quickly, with less shift shock, and is tuned much more aggressively to take advantage of the new, more powerful engine.

By sharing the idler and third gear clutches, the new transmission provides a total of five ratios without a significant increase in size or weight over typical 4-speed transmissions. Other improvements include the addition of a first gear one-way clutch for smoother shifts and a new heat exchanger design that moderates transmission operating temperature more quickly and with less complexity. An expanded torque converter lockup area provides a more direct driveline feel, similar to a manual transmission.

Using Direct Control shift technology, the new transmission uses a 16-bit, 20 MHz ECU directly controlling transmission operation in concert with the engine management system. Linear solenoids provide precise, real-time control of the clutch on/off pressure in the CL's transmission. With superior clutch-engagement accuracy, the sophisticated control logic system operates smoothly under all conditions. To reduce noise, a bearing supports the idler shaft, and gear-mesh contact ratio was refined.

Multiple safety and control strategies use interaction between engine and transmission controllers to manage overall powertrain operation. By limiting engine output torque and/or transmission clutch pressure, sharp driveline shocks are eliminated. The engine is also prevented from exceeding 5000 rpm in neutral and park.

SEQUENTIAL SPORTSHIFT SYSTEM

Both the 3.2 CL and the Type S are equipped with a Sequential SportShift system, similar to the one originally introduced in the NSX sports car. The CL's SportShift transmission operates as an automatic or puts gear selection in the hands of the driver, much like a manual transmission. By moving the console-mounted transmission selector handle to the left of the "Drive" position into a special SportShift gate, upshifts and downshifts can be commanded with a quick fore or aft motion. Gear selection is indicated by an LED display located in the tachometer face.

To foster the immediate feel of a manual transmission, in SportShift mode, the transmission logic commands firmer shifts that are approximately 10 percent quicker than in automatic mode. Additionally, the system is engineered to deliver an unusually quick response time to shift commands as compared to other semi-manual automatic transmissions.

Typically, the CL's transmission responds to a shift command in just 0.35 second, with the total shift completed in just over 0.9 second from the initial lever movement. These figures are quicker than those of semi-manual automatic transmissions of sports cars costing twice as much as the CL.

The Sequential SportShift system parallels the operation of a manual gearbox, but with built-in safety override features. The logic will not allow a downshift that would cause the engine to over-rev in the driver-selected lower gear. The transmission will stay in the selected gear until the vehicle approaches a complete stop and then will shift into first automatically. During acceleration, except for shifting between 1st and 2nd, the transmission will not up-shift automatically in SportShift Mode; however, should the driver fail to command an upshift in time, the engine ECU's will cut off the fuel flow to prevent the engine from over revving.

GRADE LOGIC CONTROL By monitoring throttle position, vehicle speed and acceleration/deceleration, then comparing these inputs with a map stored in the transmission computer, the Grade Logic Control System "knows" when the car is on a hill. The shift schedule is then adjusted automatically to hold the engine in a lower gear for better climbing power, increased downhill engine braking and reduced shift frequency.

Thanks again, Gavrill.



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2002 TL Type S
White Diamond Pearl
Parchment

hunter001

Hondabeat.com also gives very good technical details of Acura cars - about their design, technical details etc.......

Check the following link out:
http://www.hondabeat.com/acura/cltech.cfm



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2000 Naples Gold 3.2TL/Navi - Factory Stock but with up-graded tires

Fiddler

that's not information.. its marketing babble

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-Fiddler
ControlGenie Automation Systems
1998 Accord EX V6 Coupe (HomePage)