Mazda Motor Corporation

Chitoshi Morishige

Tomohiko Adachi

Tomoo Sawasaki

Yasuhide Yano

Syuichi Kawamura

Minoru Miyakoshi

Shin Wakitani

Nobutaka Wada

Tomohoko Adachi

Seiya Fujii

Toru Yamamoto

To keep plant performance constant in a control apparatus for controlling a plant including a plurality of units. The control apparatus (a PCM) controls an automobile including a plurality of units. The control apparatus includes a model controller that generates a target value of a characteristic to be achieved by each unit based on a model set for each unit, a unit specifier (a performance change determinator) that specifies a unit in which performance unique to the unit has changed among the units, and a target value corrector (an FF updater) that corrects the target value for the unit that has been specified by the unit specifier.

Control apparatus and control system

A control apparatus for controlling a stepless transmission which changes the effective diameter between a primary pulley and a secondary pulley by cyclically controlling a change rate toward a target value to be set in advance based upon the characteristic set in advance. The apparatus detects the throttle opening degree TVO, a RANGE signal, the revolutional frequency of the secondary pulley Ns and the like, and detects whether the vehicle is in a transitional status of an acceleration operation or a deceleration operation. At a point in time during the transitional period, the apparatus sets a first target value based upon the signals such as the TVO signal, the RANGE signal and the Ns signal, and sets a second target value based upon the difference between the first target value set in the current control cycle and the second target value set in the previous control cycle, at the same time, sets a change in the second target value to be smaller than that in the first target value. The change rate is controlled toward this second target value.

Control apparatus for stepless transmission for vehicles

According to a gear shift control system of a continuous transmission of the present invention, when the gear ratio is controlled to a target gear ratio, a deviation between an actual primary pulley speed and the target primary pulley speed is detected. When a feedback-control is carried out to control the actual primary pulley speed to the target primary pulley speed on the basis of the above deviation, the control gain(s) is changed according to the deviation between the actual and the target primary pulley speeds at changing the gear ratio. Thus, the gear ratio is changed at the constant speed and better gear characteristics can be gained. Moreover, the hunting of the actual primary pulley speed occurred around the target speed can be prevented.

Speed shift control system of a continuous transmission

A hydraulic control apparatus for a transmission performs hydraulic control for the pressure controlling valves by conducting a feedback pressure control on one pressure controlling valve provided in the transmission on the basis of the output of a hydraulic sensor and by performing feedforward control on the other pressure controlling valve in the transmission utilizing the results of the feedback control.

Hydraulic control apparatus for hydraulic transmission

A control apparatus for a transmission apparatus which controls the change ratio by varying, by hydraulic pressure, the effective radius of a drive pulley (primary pulley) and that of a follower pulley (secondary pulley) with a belt arranged therebetween. The apparatus a change ratio control valve for controlling the change ratio and a change ratio fixing valve for forcibly fixing the change ratio if the engine is about to rotate excessively so that the excessive rotation of the engine is prevented.

Control apparatus for stepless transmission

A hydraulic control system for a steplessly variable transmission, having primary and secondary pulley assemblies, controls a line pressure for complementarily varying effective diameters of the primary and secondary pulley assemblies so as to steplessly vary a transmission ratio of the steplessly variable transmission. The line pressure is changed according to an engine output transmitted to the primary pulley assembly from an engine and a transmission ratio of the steplessly variable transmission. A decrease of pressure is caused in the line pressure according to a thrust exerted on either one of the primary and secondary pulley assemblies caused by centrifugal force.

Hydraulic transmission control system

A steplessly variable power transmission has a torque converter provided with an input member connected with an engine output member of an engine and an output member. A belt-pulley type of steplessly variable power transmitting mechanism is provided with primary pulley device, connected with the output member of the torque converter. A secondary pulley device, constituting an output member of the transmission, is also provided and a belt connects the primary pulley devices with the secondary pulley device for transmitting power between the primary and secondary pulley device with a predetermined pulley speed ratio. A hydraulic control system controls effetive diameters of the primary and secondary pulley devices to thereby change the speed ratio of the transmission steplessly. An output torque of the torque converter or a turbine torque of the torque converter, and the pulley speed ratio are calculated. A line pressure of the hydraulic control system is controlled in accordance with signals representing the output or turbine torque and pulley speed ratio to control the effective diameter so that a slippage of the belt can be effectively prevented.

Hydraulic control system for steplessly variable transmission

A hydraulic control system for controlling a transmission of an automotive vehicle has a hydraulic pump driven by an engine to deliver a line pressure and a regulator valve for regulating the line pressure according to a pilot pressure applied thereto. To change the pilot pressure so as to regulate the line pressure to a desired pressure, a duty solenoid valve is operated at a proper duty rate with a steady signal. The steady signal for operating the duty solenoid valve at the desired duty rate is provided at a frequency which is changed according to operating conditions of the automotive vehicle.

A hydraulic control system for a steplessly variable power transmission includes primary and secondary pulleys, a belt connected with both pulleys and, hydraulic chambers for controlling effective diameters of the pulleys for changing a speed ratio steplessly. A speed ratio control valve controls the hydraulic pressure applied to the hydraulic chamber in accordance with a pilot pressure introduced into a pilot chamber provided in the speed ratio control valve means. A solenoid valve controls the pilot pressure applied to the speed ratio control valve, and a fluid pressure producing device produces a control pressure in accordance with a vehicle driving condition. A switch valve selectively connects the pilot chamber with either the solenoid valve or the fluid pressure producing device. The switch valve is actuated so as to connect the pilot chamber with the fluid pressure producing device when a deviation between an actual pilot pressure and a desirable pilot pressure is increased beyond a predetermined value. A stable speed ratio control therefore can be provided.

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Hiroshima, Japan

Chitoshi Morishige