摘要:
To curb temperature rises in a control device for a supercharger and extend the life of the control device for the supercharger, a work vehicle includes a variable geometry supercharger with variable boost pressure, and a working device driven by pressure oil discharged from a working hydraulic pump, the work vehicle further including: a supercharger control device adapted to control the supercharger; a temperature detection device adapted to detect temperature of the supercharger control device; and a main control device adapted to limit at least one of maximum rotational speed of an engine and maximum vehicle speed of the work vehicle in case the temperature of the supercharger control device is above a predetermined temperature as compared to case the temperature of the supercharger control device is below the predetermined temperature.
摘要:
A control method is provided for a powertrain in a vehicle, the powertrain including an engine mechanically connected to a gearbox and an Electronic Control Unit (ECU), wherein the method includes allowing an extraordinary gear shift in spite of a first torque comparison indicating an expected engine output torque demand above a first general limit for allowed output torque associated with the extraordinary gear shift provided that: a second torque comparison indicates that the expected engine output torque demand after the extraordinary gear shift is within the limits of a second temporarily increased allowed engine output torque limit; and an extraordinary gear shift criteria is fulfilled indicating a gear shift is allowed the criteria being dependent on at least one parameter chosen among estimated fuel efficiency, engine efficiency, expected future torque demand, time of running the engine above the general engine torque limit and engine temperature.
摘要:
A control method for controlling a transmission of a vehicle, the method comprising: receiving at least one measurement relating to a hydraulic lag of a continuously variable valve lift system that occurs in a cold condition, the continuously variable valve lift system being associated with an engine of the vehicle; determining, based on the at least one measurement relating to the hydraulic lag, an engine speed threshold above which engine power output is impaired as a result of the hydraulic lag; monitoring the engine speed; and generating an alert if the engine speed exceeds the engine speed threshold.
摘要:
Provided is a control device of an automatic transmission, by which a supercharger can be prevented from becoming high in temperature and deteriorating in durability. An automatic transmission is connected to an engine (1) in which a supercharger (2) is mounted and has a manual mode to manually select a desired gear ratio from a plurality of fixed gear ratios. A control device includes a manual mode detection unit, a temperature judgment unit (31) and a gear ratio changeover unit (43) arranged such that, when the manual mode detection unit detects that the automatic transmission is in the manual mode and when the temperature judgment unit judges that the temperature of the supercharger is higher than or equal to a predetermined value, the gear ratio changeover unit changes the gear ratio of the automatic transmission to a higher gear ratio and thereby lowers the rotation speed of the engine (1).
摘要:
An automatic transmission control apparatus includes an engine rotational speed limit verifying section and a shift control characteristic changing section. The engine rotational speed limit verifying section is configured to receive an engine rotational speed limit value for limiting an engine rotational speed and determine if the engine rotational speed limit value is lower than a prescribed normal upper limit value. The shift control characteristic changing section is configured to change a shift schedule of an automatic transmission based on the engine rotational speed being limited by the engine rotational speed limit value and the automatic transmission having a stronger tendency to select a higher gear stage than if the engine rotational speed limit value was not being limited to a lower value than the prescribed normal limit value, when the engine rotational speed limit value is determined to lower than the prescribed normal upper limit value.
摘要:
A system for controlling an automatic transmission (12) mounted on a vehicle, including an automatic mode in which gear is retrieved from a predetermined gearshift characteristics by the detected vehicle speed (VSP) and the engine load (THHF) and an manual mode in which gear is designated by a device manually operated by a vehicle driver. In the system, a temperature (TEX) in an exhaust pipe (38) of the vehicle is estimated based on the detecting operating conditions and the gear designated in the manual mode is corrected to upshift by one gear, if the estimated exhaust pipe temperature (TEX) is found to exceed a predetermined temperature, thereby improving avoidance of the occurrence of excessive thermal load of components in the vicinity of the exhaust pipe (38), and that, by not conducting forced upshift until such time, fully exploits the features of the manual mode and, by this, makes the product more appealing to customers.
摘要:
A system for controlling an automatic transmission (12) mounted on a vehicle, including an automatic mode in which gear is retrieved from a predetermined gearshift characteristics by the detected vehicle speed (VSP) and the engine load (THHF) and an manual mode in which gear is designated by a device manually operated by a vehicle driver. In the system, a temperature (TEX) in an exhaust pipe (38) of the vehicle is estimated based on the detecting operating conditions and the gear designated in the manual mode is corrected to upshift by one gear, if the estimated exhaust pipe temperature (TEX) is found to exceed a predetermined temperature, thereby improving avoidance of the occurrence of excessive thermal load of components in the vicinity of the exhaust pipe (38), and that, by not conducting forced upshift until such time, fully exploits the features of the manual mode and, by this, makes the product more appealing to customers.
摘要:
A lock-up control system for an automatic transmission of an automotive vehicle controls operation of a lock-up clutch for mechanically engaging the automatic transmission with the engine to enable transmission of a driving force output from the engine to the automatic transmission. An engaging force of the lock-up clutch is controlled in an predetermined operating region of the automotive vehicle, which is determined based on operating conditions of the automotive vehicle and the engine, in such a manner that an amount of slip of the lock-up clutch becomes equal to a desired value. An engaging force control amount for controlling the engaging force of the lock-up clutch is learned when the automotive vehicle is traveling in the predetermined operating region with the automatic transmission being in a predetermined speed position, and a learned value thus obtained is stored. The engaging force control amount is calculated by correcting the stored learned value according to load on the engine, when the automotive vehicle is traveling with the automatic transmission being in a speed position which is suitable for a lower traveling speed of the automotive vehicle than the predetermined speed position. The engaging force of the lock-up clutch is controlled by the use of the corrected engaging force control amount, when the automotive vehicle is traveling with the automatic transmission being in the above speed position which is suitable for the lower speed of the automotive vehicle.
摘要:
A lock-up control system for an automatic transmission of an automotive vehicle controls operation of a lock-up clutch for mechanically engaging the automatic transmission with the engine to enable transmission of a driving force output from the engine to the automatic transmission. An engaging force of the lock-up clutch is controlled in an predetermined operating region of the automotive vehicle, which is determined based on operating conditions of the automotive vehicle and the engine, in such a manner that an amount of slip of the lock-up clutch becomes equal to a desired value. An engaging force control amount for controlling the engaging force of the lock-up clutch is learned when the automotive vehicle is traveling in the predetermined operating region with the automatic transmission being in a predetermined speed position, and a learned value thus obtained is stored. The engaging force control amount is calculated by correcting the stored learned value according to load on the engine, when the automotive vehicle is traveling with the automatic transmission being in a speed position which is suitable for a lower traveling speed of the automotive vehicle than the predetermined speed position. The engaging force of the lock-up clutch is controlled by the use of the corrected engaging force control amount, when the automotive vehicle is traveling with the automatic transmission being in the above speed position which is suitable for the lower speed of the automotive vehicle.