Grade Logic Control for Automatic transmission is only available for 2010-2011 Accord models or is it available from 2008-2011 accord models?
5-Speed Automatic Transmission
Accord four-cylinder and V-6 models are available with 5-speed automatic transmissions with Grade Logic Control. Four-cylinder engines have a compact three-shaft transmission design that is engineered for smooth operation and fuel efficiency. To accommodate the large displacement and high power output of the Accord V-6 engine, a four-shaft, 5-speed automatic transmission related to the transmission used in the Honda Odyssey is used.
Accord's Powertrain Control Module (PCM) manages overall powertrain operation, and provides precise management of the interaction between automatic transmission and engine. This integrated control strategy makes for smoother shifts with reduced shift shock. VCM engines are equipped with a long torsional control damper to helps enhance overall transmission smoothness.
Different transmission gear ratios are used for the 177-horsepower and 190-horsepower four-cylinder engines. To take full advantage of the 190-horsepower engine's added high-rpm power, its 5-speed automatic transmission has lower second-, third- and fourth-gear ratios (higher numerically). This provides an added boost to acceleration and responsiveness. The first- and the fifth-gear ratios are common among all four-cylinder engines, resulting in an efficient and quiet cruising rpm at higher speeds.
Grade Logic Control
To reduce gear "hunting" and unnecessary shifting, Grade Logic Control and Shift Hold Control systems are integrated into the shift programming of Accord automatic transmissions. Grade Logic Control alters the 5-speed automatic's shift schedule, reducing shift frequency while traveling uphill or downhill. Using inputs monitoring throttle position, vehicle speed and acceleration/deceleration, Grade Logic compares the operating parameters with a digital map stored in the transmission computer. When the system determines the Accord is on a hill, the shift schedule is adjusted to automatically hold the transmission in a lower gear for better climbing power or increased downhill engine braking.