A control method for a hybrid work machine including an internal combustion engine which includes an exhaust gas treatment device, a generator motor which is connected to an output shaft of the internal combustion engine, and an electrical storage device which stores electric power generated by the generator motor or supplies electric power to the generator motor, the control method for the hybrid work machine includes: determining whether the hybrid work machine is in a regeneration state in which a regeneration is performed by the exhaust gas treatment device; setting a threshold value for starting a generation of power by the generator motor to a minimum generation torque as a lower limit value when it is determined that the exhaust gas treatment device performs a regeneration; and controlling the generator motor based on the set threshold value.

In a state of reverse driving with load operation of an engine, an upper limit torque Temax of the engine is set to cause a total torque of a torque demand Tr* and a cancellation torque for cancelling a torque applied to a driveshaft accompanied with load operation of the engine to be output from a second motor to the driveshaft. A product of the upper limit torque Temax of the engine and an upper limit rotation speed Nemax of the engine is set to an upper limit power Pemax. A target power Pe* of the engine is then set in a range of not greater than the upper limit power Pemax. The engine, a first motor and the second motor are then controlled such as to cause the target power Pe* to be output from the engine and such as to output the torque demand Tr* to the driveshaft.

A hybrid vehicle includes an engine, a first rotating electrical machine (first MG), a second rotating electrical machine (second MG), a planetary gear mechanism which mechanically couples these devices, a first inverter which drives the first MG, a second inverter which drives the second MG, and a controller. When the controller receives a fail signal from the first inverter, the controller performs shut-down control which brings the first inverter into a gate shut-down state with fuel supply to the engine being stopped. When the absolute value of an engine rotation speed Ne is more than or equal to a predetermined value and the absolute value of a rotation speed Nm1 of the first MG is less than a threshold value after the shut-down control is started, the controller determines that the first inverter has a short-circuit fault.

An engine stopping system for reducing electric consumption by interrupting power supply to a motor during disengagement of a clutch is provided. The engine stopping system is applied to a vehicle in which the clutch is interposed between an engine and a power distribution device. The engine stopping system is configured to interrupt power supply to the motor while bringing the clutch into disengagement, when an input speed N.sub.in falls below a threshold value , under conditions that the engine does not generate power during engagement of the clutch, and that the motor generates electricity utilizing an inertia torque of the engine while controlling an output torque of the motor to lower the engine speed.

A hybrid or electric vehicle includes a traction battery to store and provide energy for the vehicle. The traction battery includes a number of battery cells. For effective operation of the traction battery, operating parameters, such as state of charge and battery power limits, may need to be known. The operating parameters may be a function of battery cell voltage and impedance parameters. A parameter estimation scheme may use measured cell voltages and a measured traction battery current as inputs. A current measurement bias may be modeled that incorporates measurement bias caused by asynchronous current and voltage measurements. The current measurement bias may be estimated for each cell and the value may differ between cells.

A hybrid vehicle includes an electric control unit. A predictable condition may be a condition that the time period from beginning of a charging of a battery to beginning of a rapid decrease in charged electricity is predicted to be within a specified time period. The electronic control unit may be configured to control a first motor such that a motoring of an engine is performed at a first speed by the first motor. The electronic control unit may be configured to prevent motoring of the engine by the first motor when the predictable condition is not satisfied. The electronic control unit may be configured to control the first motor such that the motoring of the engine is performed at a second speed that is higher than the first speed by the first motor when the predictable condition is satisfied.

A hybrid vehicle includes a control unit that performs control such that the motoring of an engine is carried out at a higher rotational speed when a required braking force is large than when the required braking force is small, from the start of charge of a battery to the start of rapid decrease in a charging power of the battery, in the case where predetermined control is performed to control a first motor and a second motor such that the battery is charged within a range of a permissible charging power through regenerative driving of the second motor and the motoring of the engine by the first motor with fuel injection stopped and that the required braking force at a braking request is applied to the vehicle, in response to the making of the braking request during the performance of cruise control or variable speed limiter control.

Methods and systems are provided for controlling and diagnosing a mechanical vehicle component. In one example, a method may include determining an input device state and an electric machine torque at a diagnostic controller, and identifying a fault condition based on these determinations. Further, the diagnostic controller may trigger an active fault state of the mechanical vehicle component to avoid unintended vehicle acceleration, particularly at low speeds.

Disclosed is a hybrid power system including a computing core, a power converter, a driving motor, an engine generator, a charging stand, and a battery pack. The power converter is coupled to the computing core. The driving motor is coupled to the power converter. The engine generator is coupled to the power converter. The charging stand is coupled to the power converter. The battery pack is coupled to the power converter. When inputting a required torque to the computing core and switching to a charging mode, an electric energy source is coupled to the charging stand and provides power to the battery pack through the power converter. The computing core executes an optimal power allocation algorithm.

A control method of a low voltage DC-DC converter for a hybrid vehicle is provided. The method includes determining a vehicle drive mode, determining vehicle driving condition, and determining vehicle condition information including a motor output alteration and a gear mode. Further, an output mode of the low voltage converter is determined based to the drive mode, the driving condition, and the condition information and an output voltage of the low voltage converter is adjusted based on temperature and SOC of a battery in the determined output mode.