Abstract: A hybrid vehicle drive system including (a) an engine, (b) an electric motor, (c) a planetary gear device having a first rotary element connected to the engine, a second rotary element connected to the electric motor and connected through a first clutch to an output member connected to vehicle drive wheel, and a third rotary element connected through a second clutch to the output member, (d) a forward-motor-drive control device for engaging the first clutch and releasing the second clutch to thereby establish a forward motor drive mode in which the vehicle is driven in a forward direction by the electric motor, (e) a forward-engine-drive control device for engaging at least the second clutch to establish an engine-drive mode in which the vehicle is driven in the forward direction by the engine, and (f) a second-clutch control device operable upon switching of a vehicle drive mode from the forward motor drive mode to the forward engine drive mode, for engaging the second clutch only after the engine speed has

Abstract: A hybrid vehicle drive system including (a) an engine, (b) an electric motor, (c) a planetary gear device having a first rotary element connected to the engine, a second rotary element connected to the electric motor and connected through a first clutch to an output member connected to vehicle drive wheel, and a third rotary element connected through a second clutch to the output member, (d) a forward-motor-drive control device for engaging the first clutch and releasing the second clutch to thereby establish a forward motor drive mode in which the vehicle is driven in a forward direction by the electric motor, (e) a forward-engine-drive control device for engaging at least the second clutch to establish an engine-drive mode in which the vehicle is driven in the forward direction by the engine, and (f) a second-clutch control device operable upon switching of a vehicle drive mode from the forward motor drive mode to the forward engine drive mode, for engaging the second clutch only after the engine speed has

Abstract: A control apparatus for controlling a hybrid automotive vehicle including an engine and an electric motor as drive power sources for driving the vehicle, and an electric generator operable by the engine to charge a battery while the vehicle is driven by the engine. The control apparatus includes a charging opportunity selecting device operable to determine whether the battery should be charged by the electric generator, on the basis of at least one of a required charging amount of electric energy with which the battery is charged and an energy conversion efficiency of said electric generator.

Abstract: A control apparatus for a power train including a continuously variable transmission and a clutch arranged in series with the continuously variable transmission is provided in which an engaging pressure of the clutch is first reduced until a slip occurs, and is then increased after detection of the slip so as to re-engage the clutch, and an engaging pressure of the clutch to be established is calculated by giving an excess pressure to the engaging pressure at which the clutch is re-engaged, such that an excess amount of the transmitted torque of the clutch is set smaller than that of the continuously variable transmission. The control apparatus is adapted to determine a learned value as a correction value of the engaging pressure that is set in advance in accordance with an input torque applied to the clutch, based on the engaging pressure calculated by giving the excess pressure to the engaging pressure at which the clutch is re-engaged.

Abstract: A control apparatus for a drive system, in which a power source is activated to output a torque by an energy fed from an energy source so that the torque is transmitted to rotary members through a torque transmission element having a variable transmission torque capacity. The stop of the power source due to the exhaustion of energy is predicted to increase the transmission torque capacity of the torque transmission element.

Abstract: A control apparatus for controlling a drive mechanism including a continuously variable transmission and a clutch device torque capacities of which are variable and which are disposed in series with each other between a drive power source and drive wheel, the control apparatus including a clutch-torque-capacity adjusting portion for adjusting the torque capacity of the clutch device such that the clutch device is capable of transmitting an output torque of the drive power source, without a slipping action of the clutch device, and a transmission-torque-capacity adjusting portion for adjusting the torque capacity of the continuously variable transmission after the torque capacity of the clutch device has been adjusted by the clutch-torque-capacity adjusting means, such that the continuously variable transmission is operable without a slipping action thereof.

Abstract: Methods and apparatus for a vehicle drive control apparatus changes in the transfer torque capacity of a power transfer device according to various states of operation with respect to at least one drive power source. The vehicle drive control apparatus includes a power transfer device that has a variable transfer torque capacity and the drive power sources that rotate a device wheel via the power transfer device. A controller is included that causes a vehicle to selectively run in a variety of run modes that differ in states of operation with respect to at least one of the drive power sources. The controller changes the transfer torque capacity of the power transfer device in accordance with the various run modes. According to the vehicle device control apparatus, a target oil pressure is raised by a predetermined amount when the mode of run is change, or when the vehicle descends in a direction opposite to a vehicle starting direction at the time of a hill climb start.

Abstract: A thrust ratio calculation section 50 calculates a thrust ratio based on driving pulley thrust from a driving pulley thrust calculation section 44 and following pulley thrust from a following pulley thrust calculation section 48. A thrust ratio state of change identifying section 52 detects a peak of a thrust ratio caused by changing of the following pulley thrust, based on the thrust ratio and the following pulley thrust. The following pulley thrust is maintained such that the thrust ratio remains at the peak. This enables appropriate control of the pulley thrust.

Abstract: A control apparatus for a drive system, in which a power source is activated to output a torque by an energy fed from an energy source so that the torque is transmitted to rotary members through a torque transmission element having a variable transmission torque capacity. The stop of the power source due to the exhaustion of energy is predicted to increase the transmission torque capacity of the torque transmission element.

Abstract: An apparatus for rear-driving an automotive vehicle having a drive power source, an output member operatively connected to a drive wheel, a gear type synthesizing/distributing device including a housing, and a first, a second and a third rotary element, the first and second rotary elements being rotated in respective opposite directions when the third rotary element is stationary, and connected to the drive power source and the output member, respectively, and a brake or fixing the third rotary element to the housing, wherein the brake is a frictional coupling device capable of effecting a slipping engagement.

Abstract: An apparatus for controlling a hybrid vehicle with a power transmitting system including a transmission and a planetary gear device having a first rotary element connected to a first drive power source such as an engine, a second rotary element connected to a second drive power source and to the transmission through a first clutch, and a third rotary element connected to the transmission through a second clutch, the apparatus including a neutral-mode determining device operable when the first and second clutches are in a released state, for determining whether the power transmitting system is placed in a first or a second neutral state, depending upon which one of the first and second clutches is to be engaged when a driving of the hybrid vehicle is subsequently initiated, a first synchronizing device operable when the power transmitting system is placed in the first neutral state, for synchronizing speeds of a pair of friction members of the first clutch with each other, and a second synchronizing device ope

Abstract: A drive control system for a hybrid vehicle in which an internal combustion engine is selectively coupled through a clutch mechanism to a power transmission line coupled to an electric motor. The drive control system comprises: motoring device for coupling the engine to the power transmission line to rotate the engine, with the feed of a fuel to the engine being stopped when the hybrid vehicle is driven to run by the output of the electric motor, by controlling the clutch mechanism in an applied state. Thus, it is possible to start the engine even at a low speed of the hybrid vehicle and to prevent the deterioration in the riding comfort, as might otherwise be caused by the fluctuation in a driving torque.

Abstract: A drive control system for a hybrid vehicle, in which the output torques of an electric motor and an internal combustion engine are synthesized by and outputted from a torque synthesizing/distributing mechanism. The target speed of the engine is determined on the basis of the output demand for the engine and the output speed of the torque synthesizing/distributing mechanism, and the target speed of the motor is determined on the basis of the target speed of the engine and the output speed of the torque synthesizing/distributing mechanism. The output of the engine is controlled to the output torque which is determined on the basis of the output demand for the engine and the target speed of the engine, and the output speed of the motor is controlled to the target speed.

Abstract: A control system for improving the fuel economy of a hybrid vehicle by evaluating a fuel to be consumed for a charging operation thereby to select a running mode. Specifically, a drive control system for a hybrid vehicle including an internal combustion engine, an electric motor and a battery device.

Abstract: A drive control system for a hybrid vehicle in which an internal combustion engine is selectively coupled through a clutch mechanism to a power transmission line coupled to an electric motor. The drive control system comprises: motoring device for coupling the engine to the power transmission line to rotate the engine, with the feed of a fuel to the engine being stopped when the hybrid vehicle is driven to run by the output of the electric motor, by controlling the clutch mechanism in an applied state. Thus, it is possible to start the engine even at a low speed of the hybrid vehicle and to prevent the deterioration in the riding comfort, as might otherwise be caused by the fluctuation in a driving torque.

Abstract: In a vehicular automatic transmission, a coast downshift is executed in an appropriate engine-braking state and with a light gearshift shock. While predetermined conditions for the execution of the downshift are met, an oil pressure to be fed to a clutch (c12 in FIG. 1) on the side of a gearshift output stage (a lower speed stage) is controlled, for example, in order that the input shaft speed (turbine speed01 in FIG. 1) of the automatic transmission may agree with a desired value adapted to keep the weak engine-braking state.

Abstract: A drive control system for starting an internal combustion engine of a hybrid vehicle running while transmitting the output of an electric motor to a power transmission line for the run, by coupling the internal combustion engine to the power transmission line. The drive control system comprises: a start demand deciding unit for deciding a demand for the start of the internal combustion engine; and an assist setting unit for raising the output torque of the electric motor, when the demand for starting the internal combustion engine is decided by the start demand deciding unit, by a torque corresponding to either a motoring torque necessary for rotating the internal combustion engine or a summed torque of the motoring torque and an inertia torque according to the changing rate of the revolution speed of the internal combustion engine.

Abstract: A drive control system for a hybrid vehicle for preventing a delay in the application of a one-way clutch in a transmission and an application shock. In this drive control system, an electric motor and an internal combustion engine are coupled to the input side of a transmission having at least one gear stage to be set by applying a one-way clutch. The drive control system comprises: a detector for detecting a coasting state in which the one-way clutch is released in a deceleration state set with the gear stage; and an input speed raising device for driving the electric motor when the coasting state is detected, so that the input speed of the transmission may approach the synchronous speed which is the product of the gear ratio of the gear stage to be set by applying the one-way clutch and the output speed of the transmission.

Abstract: A control apparatus for an automatic transmission of twin clutch type, in which a skip downshift is executed with a light gearshift shock and in a short gearshifting time period. As illustrated in FIG. 1, after the release of a clutch C2, a command for switching over a synchro mechanism is issued at a time t3. When the r.p.m. NT of a turbine has reached the synchronous r.p.m. NT3 of the intermediate stage of the skip downshift, the oil pressure of a clutch C1 is raised in order that the rising rate of the turbine r.p.m. (speed) NT may become a predetermined value d/dt(NT1) or d/dt(NT2). Thereafter, the oil pressure of the clutch C1 is controlled in order that the turbine r.p.m. NT may maintain a value NT2 (synchronous r.p.m. of the lower speed stage of the skip downshift)+.DELTA.NT4. After the completion of the switchover of the synchro mechanism, the oil pressure of the clutch C2 is gradually raised, and that of the clutch C1 is gradually lowered. Thus, the skip downshift in a power-ON state is executed.

Abstract: In a gearshift control apparatus for an automatic transmission which performs a downshift under power ON state, after a command for a clutch-to-clutch downshift has been issued, the hydraulic pressure of a higher-speed-stage side clutch is first lowered to raise the input r.p.m. of the transmission. When the beginning of rise in the input r.p.m. of the transmission has been detected, the hydraulic pressure of the higher-speed-stage side clutch is subjected to a feedback control so that the change rate of the input r.p.m. of the transmission may become a specific value. Upon the detection that the input r.p.m. of the transmission have come near to the synchronous r.p.m. of a lower speed stage, the hydraulic pressure of the lower-speed-stage side clutch is gradually raised, and simultaneously, the hydraulic pressure of the higher-speed-stage side clutch is subjected to a feedback control on the basis of the input r.p.m. of the transmission.