摘要:
Engine racing is determined during shift in an automatic transmission having clutches associated with respective gear positions, by, after a shift command is issued to effect a shift in a power-on mode, detecting the input and output rotational speed ratios of previous-gear-position and next-gear-position clutches of the transmission, and determining that engine racing has occurred if the input and output rotational speed ratio of one of the clutches which is normally greater than 1.0 during a gear shift remains below a threshold value slightly smaller than 1.0 for a predetermined period of time.
摘要:
In a system for controlling a gear ratio of a multi-step geared or continuously variable automatic transmission of a vehicle based on determined parameter indicative of operating condition of the vehicle including a driving resistance, the driving resistance is calculated in an equation in which motive force-driving resistance=vehicle mass.times.acceleration using the law of motion. In the first embodiment, the calculation is carried out, without using a torque sensor, by applying an adjustment for torque consumption by a device such as an air conditioner and a torque loss caused by braking. In the second and third embodiments, the driving resistance is calculated using a torque sensor. Thus, with the arrangement, the driving resistance can be accurately determined applying appropriate adjustment, a gear ratio to be shifted is properly determined in any traveling condition including hill climbing.
摘要:
In a control system for controlling a gear ratio of a multi-step geared or continuously variable automatic transmission, the driver's intention to decelerate is inferred by carrying out a first fuzzy reasoning using a degree of throttle opening or the like and then the target gear ratio is determined by carrying out a second fuzzy reasoning using parameters including the inferred driver's intention to decelerate. The first fuzzy reasoning is carried out using fuzzy production rules classified by operating conditions such as a road profile and a vehicle speed. The inferred driver's intention to decelerate is canceled if braking is discontinued. Thus the control ascertain the intention of the driver and is thus possible to achieve sophisticated shift scheduling well matched to the sensibilities of the driver.
摘要:
The amount of engagement of a direct couping mechanism such as lockup clutch (6) disposed between input and output members of a hydrodynamic driving apparatus such as a torque converter (5) to mechanically connect or disconnect the input and output members (5a, 5b) is controlled so as to bring a parameter indicative of the amount of slippage between the input and output members into a predetermined reference range. The average value of the parameter which is measured in a prescribed time interval is determined, and a control value for the amount of engagement in a next prescribed time interval is determined based on the differnece between the average value and the predetermined reference range value.
摘要:
A controller for an automatic transmission hydraulic clutch includes a hydraulic clutch engaged by hydraulic pressure, a hydraulic pressure control valve for regulating the hydraulic pressure, and a detector for detecting a condition immediately before engagement of the hydraulic clutch based upon a change in the hydraulic pressure. A timing controller adjusts timing to change a control force in the hydraulic pressure control valve in response to detection of a condition immediately before engagement of the clutch.