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Electrical/hydraulic transmission control system varying line pressure according to engine load
| Details |
Inventors: Taga, Yutaka; Nakamura, Shinya;
Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota, JP)
Primary Examiner: Herrmann; Allan D.
Assistant Examiner: Andrews; Stephen B.
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland & Maier
A control system for an automatic transmission which includes one or more hydraulically actuated friction engaging mechanisms. An electrical control device receives electrical signals representing engine load and vehicle speed from sensors for these quantities, decides which speed stage of the transmission should currently be engaged, and selectively supplies actuating electrical energy to one or more hydraulic fluid pressure switching valves. These valves selectively provide supply of line pressure from a line pressure generator to the hydraulically actuated friction engaging mechanisms so as selectively to engage the desired speed stage of the transmission. This line pressure generator which produces the line pressure is controlled according to the current value of a certain parameter representative of engine load. The value of the line pressure generated by this line pressure generator varies in response to the current value of this parameter representative of engine load. Accordingly the value of line pressure can be adjusted according to engine load so as to be most appropriate for engaging each one of the friction engaging mechanisms from its disengaged condition when so required, the line pressure being thus varied in response to engine load which determines the torque which the friction engaging mechanisms will each be required to transmit when engaged. Thus both jerky engagement and also slippage during the process of engagement of the friction engaging mechanisms can be prevented, and such smooth engagement of the friction engaging mechanisms ensures long life for the transmission. |
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DETAILED DESCRIPTION Accordingly, it is the primary object of the present invention to provide a transmission control system, in which the decisions as to which speed stage the transmission should be set are performed based upon engine parameters including a first engine load signal as the engine load signal, while the line hydraulic fluid pressure is tailored based upon engine parameters including a second engine load signal as the engine load signal which is independent of said first engine load signal.
It is a further object of the present invention to provide a transmission control system, in which the decisions as to which speed stage the transmission should be set are performed electrically, and in which said first engine load signal is an electric signal generated by an electric throttle sensor.
It is a further object of the present invention to provide such a transmission control system, in which said second engine load signal which modulates said line hydraulic fluid pressure is the throttle hydraulic fluid pressure generated by a throttle hydraulic fluid pressure generator.
It is a further object of the present invention to provide such a transmission control system, in which the actuating hydraulic fluid pressure for a hydraulic fluid pressure actuated friction engaging mechanism is properly and appropriately modulated according to variation in the engine load.
It is a further object of the present invention to provide such a transmission control system, in which the coupled elements of a hydraulic fluid pressure actuated friction engaging mechanism are pressed together, when the hydraulic fluid pressure actuated friction engaging mechanism is to be engaged, with the most appropriate pressing force, taking into account the current value of engine load.
It is a further object of the present invention to provide such a transmission control system, in which the coupled elements of a hydraulic fluid pressure actuated friction engaging mechanism, when the hydraulic fluid pressure actuated friction engaging mechanism is to be engaged, are not pressed together too hard, taking into account the current value of engine load
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Exercise Devices 
