A hybrid drive train includes a first electric motor, a nested power splitting planetary gear set having a first carrier element and a second carrier element, an inner sun gear coupled with the first electric motor and an outer sun gear coupled with an output shaft. A first selectable one-way clutch controls the first and the second carrier element, and switches between operation as a one way clutch and operation as a brake. A second selectable one-way clutch controls a ring gear of the nested planetary gear set, and switches between operation as a one way clutch and operation as a brake. The extra outer planetary gear set improves lowing capacity at higher speeds without substantially increasing the axial length of the power split device.

In a hybrid vehicle including an engine, a first motor, a differential unit, a second motor, a driving force split device, and a controller, the controller is configured to control the engine, the first motor, and the second motor such that the hybrid vehicle travels with the engine rotating within a range of an allowable maximum rotational speed for control or less. In this case, the controller is configured to set the allowable maximum rotational speed such that the allowable maximum rotational speed is higher when a main-side ratio is lower than when the main-side ratio is higher. The main-side ratio is a ratio of a driving force that is transmitted to main drive wheels to the total driving force that is transmitted from a drive shaft to the main drive wheels and sub drive wheels via the driving force split device.

A control system for a hybrid vehicle that reduces delay in engagement of a clutch when shifting an operating mode by manipulating the clutch. A controller is configured to adjust a speed of a first motor to a first standby speed at which the speed difference in a first clutch is reduced when an operating mode will be shifted from a single-motor mode to a first mode, and adjust a speed of the first motor to a second standby speed at which a speed difference in the second clutch is reduced when the operating mode will be shifted from the single-motor mode to a second mode.

A vehicle drive device and a control method therefor are provided. The vehicle drive device includes: a power source including a first rotating electrical machine; a second rotating electrical machine; a differential unit including three rotating elements to which a first output shaft, a second output shaft, and the second rotating electrical machine are connected; and an electronic control device. The electronic control device regeneratively controls the first rotating electrical machine and the second rotating electrical machine in such a manner that negative torque is applied to the first output shaft and the second output shaft, when performing regenerative control by the second rotating electrical machine in a drive mode in which torque from the power source is distributed to the first output shaft and the second output shaft by controlling torque of the second rotating electrical machine during deceleration of a vehicle.

A fire fighting vehicle includes a chassis, tractive elements coupled to the chassis, a pump coupled to the chassis, a discharge fluidly coupled to the pump, an accessory module coupled to the chassis, and an electric motor coupled to the chassis, the pump, and the accessory module. The accessory module is configured to receive a mechanical energy input and provide at least one of electrical energy or fluid energy. The electric motor is configured to provide mechanical energy to drive (a) the pump to provide fluid to the discharge such that the fluid is expelled from the discharge and (b) the accessory module to provide the at least one of electrical energy or fluid energy.

The present invention provides a power system for a hybrid vehicle, relating to the field of hybrid vehicles. The power system for a hybrid vehicle adopts a first planetary gear mechanism with two sun gears, the first sun gear rotates with an input shaft, the second sun gear and the input shaft are independent of each other, and the second sun gear achieves different motion states through a second brake or/and a second clutch, and cooperates with a first brake to provide different transmission ratios of four to six gears when an engine and motors are in driving, so that the power system is simple in structure and low in cost, and the fuel economy and acceleration dynamic performance of the power system are improved.

A control device for a hybrid vehicle includes an engine operating point control unit that shifts an engine operating point to an engine operating point on an optimal fuel-efficiency operating line outside a predetermined noise generation region in which combustion sounds of an engine become noise when the engine operating point is in the noise generation region. Accordingly, when the engine operating point is in the noise generation region, the engine operating point control unit shifts the engine operating point to an engine operating point on the optimal fuel-efficiency operating line outside the noise generation region. As a result, since the engine operating point is not separated from the optimal fuel-efficiency operating line even when the engine operating point departs from the noise generation region, it is possible to curb a decrease in fuel efficiency.

A control device includes: an engagement mechanism having a first engagement element and a second engagement element; and an actuator that generates a thrust that brings the first engagement element and the second engagement element close to each other when the engagement mechanism is engaged. The control device performs engagement with the thrust of the actuator when a differential rotation speed of the engagement mechanism is less than a predetermined value. In the control device, a parameter indicating an operating state of the actuator is detected, a target differential rotation speed is calculated in accordance with a value of the detected parameter, and the differential rotation speed is controlled to the calculated target differential rotation speed.

A power transmission apparatus of a hybrid vehicle using an engine and a motor-generator as a power source, includes a first shaft fixedly connected to an output side of the engine, a second shaft selectively connectable to the first shaft and fixedly connected to the motor-generator, a third shaft selectively connectable to the second shaft, a fourth shaft disposed without rotational interference in the external circumference of the third shaft, a fifth shaft externally geared with the third and fourth, a sixth shaft externally geared with the fourth shaft, a planetary gear set including first, second, and third rotation elements, and one of the three rotation elements is fixedly connected to the second shaft, the other rotation element is selectively connectable to a transmission housing, and the other rotation element is fixedly connected to the fourth, and four gear trains forming an external gear connection between the first, second, third, fourth, fifth and sixth shafts.

A control system for a hybrid vehicle configured to accelerate the coasting hybrid vehicle sharply in response to a depression of an accelerator pedal. A controller is configured to: shift an operating mode from low mode to high mode at a higher speed in a case that the hybrid vehicle coasts without depressing an accelerator pedal, compared to a case that the hybrid vehicle is propelled by depressing the accelerator pedal; and delay a timing to shift the operating mode from the low mode to the high mode for a predetermined period of time when accelerating the coasting hybrid vehicle by depressing the accelerator pedal.