61results about How to "Degraded drivability" patented technology

A hybrid propulsion system for a vehicle. The system including, a transmission device for transmitting torque to a first at least one drive wheel, a first electric energy conversion device coupled to an input of the transmission device, a second electric energy conversion device for transmitting torque to a second at least one drive wheel, and a control system, during a vehicle speed control operation where a speed of the vehicle is maintained at a desired speed, in response to acceleration resulting in vehicle speed beyond the desired speed, the acceleration not caused by vehicle operator input, the control system varying torque output of at least one of the first electric energy conversion device and the second electric energy conversion device to provide brake torque to at least one of the first at least one drive wheel and the second at least one drive wheel to decelerate the vehicle to the desired speed, selection of said one of the first and second electric energy conversion device based on an operating condition.

The invention is directed toward methods for operating a parallel hybrid vehicle in a manner that responds to the operator's demand for power output, while maximizing engine efficiency and minimizing disruptions in vehicle drivability. According to principles of the present invention, when the driver of a hybrid vehicle makes a demand for power output immediately after a braking event, the power provided to meet the initial demand is from either an ICE or a secondary power source. Which power source is used, and when it is engaged and disengaged, depends on various vehicle operating conditions. Also, the ICE is selectively turned off and on in response to various operating conditions.

Varying oil injection by an oil injector onto a piston of an engine to accommodate different operating conditions.

An integrated control system includes a main control system (accelerator) controlling a driving system, a main control system (brake) controlling a brake system, and a main control system (steering) controlling a steering system, based on manipulation by a driver, as well as an adviser unit generating and providing information to be used at each main control system based on environmental information around a vehicle or information related to a driver. The advisor unit executes a program including the steps of: sensing a vehicle state, driver's manipulation, and environmental information; operating an expected value by the driver with regard to a driving force; performing distribution processing of a braking / driving torque; and operating a distribution ratio so as to carry out distribution.

A vehicle propulsion system and method of operation are presented. As one example, the method includes operating an engine to produce an engine output; transferring the engine output to one or more drive wheels of the vehicle via a transmission; responsive to a first condition, varying torque supplied to the drive wheels by adjusting a relative number of combusting cylinders and deactivated cylinders of the engine; and responsive to a second condition, varying the torque supplied to the drive wheels by adjusting a number of strokes performed by the combusting cylinders per combustion cycle while shifting the transmission between different gear ratios.

A fuel control approach that compensates for time delays to increase exhaust gas sensor feedback response speed.

A control apparatus for an internal combustion engine is configured, during a slightly stratified-charge lean-burn operation, to: calculate a basic total fuel injection amount based on a required torque; calculate a compression stroke injection amount based on an ignition delay index value; calculate, as a basic main injection amount, a value obtained by subtracting a compression stroke injection amount from the basic total fuel injection amount; calculate, based on an output value of an in-cylinder pressure sensor, an actual specified combustion index value that represents a main combustion speed or a combustion fluctuation rate; calculate a main injection correction term based on a result of a comparison between a target specified combustion index value or a tolerable specified combustion index value, and the actual specified combustion index value; and calculate a main injection amount by adding the main injection correction term to the basic main injection amount.

An electric drive vehicle which is capable of performing a bidirectional voltage conversion between two DC power supplies and a rotary electric machine, and a connection switch between a series connection and a parallel connection of the two power supplies with respect to the rotary electric machine. The electric drive vehicle can supply electric power without a delay in response to a change in a load request. A controller sets the connection between the two power supplies to the parallel connection when an estimated value of an output electric current in accordance with a torque command to the rotary electric machine exceeds a tolerable electric current value of at least one of the two power supplies.

A fuel control approach that compensates for time delays to increase exhaust gas sensor feedback response speed.

This invention discloses a semiconductor memory device having a voltage supply circuit for generating a driver power supply voltage. The voltage supply circuit is provided with a first voltage supply circuit for precharging the driver power supply voltage to a power supply voltage level of a memory cell, and a second voltage supply circuit for supplying a voltage lower than the power supply voltage level of the memory cell as the driver power supply voltage.

A semiconductor memory device that can achieve high-speed operation or that is highly integrated and simultaneously can achieve high-speed operation is provided. Transistors are disposed on both sides of diffusion layer regions to which capacitor for storing information is connected and other diffusion layer region of each transistor is connected to the same bit line. When access to a memory cell is made, two transistors are activated and the information is read. When writing operation to the memory cell is carried out, two transistors are used and electric charges are written to the capacitor.

The objective of this invention is to provide a static memory cell and an SRAM device that can improve the write margin while preventing degradation of the static noise margin. By turning on / off transistor Qp13, it is possible to control the drop in voltage due to the threshold voltage of transistor Qn15. For example, in read mode, when it is necessary to hold the stored data while setting word line WL to the high level, transistor Qp13 is turned off; the drivability of transistor pair Qn11, Qn12 is decreased, thereby increasing the static margin. In the case of rewriting the stored data, transistor Qp13 is turned on; the drivability of transistor pair Qn11, Qn12 is increased, thereby increasing the write margin. As a result, it is possible to improve the performance of both the static noise margin and the write margin.

An electric vehicle driven by a synchronous motor 21 and an induction motor 31, and braked with a first regenerative torque BT1 generated by the synchronous motor generator 21 and a second regenerative torque BT2 generated by the induction motor generator 31. The ratio of the first regenerative torque BT1 to the second regenerative torque BT2 is changed in accordance with a state of charge (SOC) of a battery 11. In this way, a switching frequency from a regenerative brake to a hydraulic brake is restricted to improve drivability when a state of charge (SOC) of the battery 11 is high.

The fuel cell system of the present invention comprises: an electric motor, a fuel cell stack, a fuel supply unit, and a controller that controls a power-plant including the fuel cell stack and the fuel supply unit. The controller comprises further: a stack output-response request computing unit to compute a stack output-response request requested for the fuel cell stack; a stack voltage setup unit during idle-stop to set up a lower limit of stack setup-voltage during idle-stop that is set up as a stack voltage during execution of idle-stop so as to be higher as the stack output-response request is larger, and so as to be lower as the request is smaller; and an operation unit of recovering a stack voltage during idle-stop to execute a recovery operation when an actual stack voltage becomes, during execution of idle-stop, lower than the lower limit of stack setup-voltage during idle-stop.

A calculating section finds a left-right rear wheel drive force difference transient control computation value, which is a basic target value for a turning response transiently requested by a driver through a steering speed at current wheel speeds (vehicle speed). A computing section finds a left-right drive force difference transient control gain based on a target yaw rate change rate such that the control gain is smaller than 1 in a high target yaw rate change rate region. The computing value is multiplied by the control gain to calculate a left-right rear wheel drive force difference transient control amount for a left-right wheel drive force distribution control. As a result, during high-speed steering when the yaw rate gain tends to increase, the left-right drive force difference transient control amount is revised to a decreased value such that the transient control amount causes less of an increase in the yaw rate.

A control system for a vehicle includes an electronic control unit. The electronic control unit is configured to i) calculate a target supercharging pressure of an intake air such that, when an internal combustion engine is operated through the homogeneous charge compression ignition, the internal combustion engine achieves a required output while satisfying a predetermined requirement, ii) control an output of the internal combustion engine such that the output approaches the required output in accordance with an actual supercharging pressure in process of changing the actual supercharging pressure to the target supercharging pressure that is achieved by a supercharger, and iii) control a rotary machine such that an output of the rotary machine compensates for part or all of a differential output between the required output and the output in process of changing the actual supercharging pressure to the target supercharging pressure.

The ground contact pressure on land portions 44 is uniformed so that drivability is improved and uneven wear is suppressed to improve wear resistance. The parts of the carcass layer 28 and belt layer 33 overlapping with the main grooves 42 are convexly curved toward the outside in the radial direction due to the internal pressure. The reinforcing layer 49 is arranged at the position spaced from the neutral axis of deformation in the compressed side in a certain distance, i.e. radially inside of the radially outermost carcass ply 30, and the steel cords 47 which extend in the direction including the tire width direction and its approximate direction and which act as supports for resisting against the compression force are embedded in the reinforcing layer. As a result, the above-mentioned curved deformation can be effectively suppressed.

A control apparatus for a vehicle equipped with an automatic transmission having an apply element that is applied when the vehicle takes off from a standstill, which executes a neutral control which releases the apply element when the automatic transmission is in a forward-drive range and the vehicle is stopped with a predetermined condition being satisfied, includes a controller that detects a target idle speed of an engine and determines whether the neutral control can be executed based on the target idle speed.

Various method for operating an engine responsive to transmission shifts under non-fueling conditions are provided. In one example, a method of operating an internal combustion engine comprises deactivating at least one engine cylinder, performing a diagnostic while the at least one engine cylinder is deactivated and while the engine is operating under high load, predicting a transmission shift, and responsive to the predicted transmission shift, reducing engine load below the high load and terminating the diagnostic.

Provided is a technology capable of ensuring drivability of an electric vehicle while preventing thermal destruction of its parts and deterioration of a battery, caused by an LC resonance. The present specification discloses a motor controller for an electric vehicle having a battery, a converter circuit, an inverter circuit, a smoothing capacitor, and a motor, the motor controller configured to control a drive of the motor by controlling an operation of the inverter circuit. In this motor controller, an operating region of the motor that causes a resonance of an LC circuit configured by a reactor of the converter circuit and the smoothing capacitor is set as a resonance region. In this motor controller, execution of square-wave control on the motor is permitted only over a predetermined time period, when the converter circuit is not boosting the DC power and an operating point of the motor is included in the resonance region.

An engine is provided. The engine includes a piston operable to reciprocate in a cylinder, a crankshaft rotatably coupled to the piston, and a supercharger rotatably coupled to the crankshaft. The supercharger has an unequal distribution of mass along a longitudinal plane of the supercharger to provide a rotational counterbalance to reduce engine imbalance.

A semiconductor memory device that can achieve high-speed operation or that is highly integrated and simultaneously can achieve high-speed operation is provided. Transistors are disposed on both sides of diffusion layer regions to which capacitor for storing information is connected and other diffusion layer region of each transistor is connected to the same bit line. When access to a memory cell is made, two transistors are activated and the information is read. When writing operation to the memory cell is carried out, two transistors are used and electric charges are written to the capacitor.

An apparatus and a method for controlling a driving mode of an HEV are provided. The apparatus releases an HEV mode at an appropriate time before forcibly releasing an engine clutch even when an accelerator pedal is engaged while driving the vehicle on an uphill road in the HEV mode to reduce a shock caused when the engine clutch is forcibly disengaged and improve riding comfort and drivability. The method includes determining whether the vehicle is driven on an uphill road from gradient information of a current road while the vehicle is driven in a HEV mode and determining a clutch engagement impossible speed corresponding to the gradient of the current road when the vehicle is driven on the uphill road. The engine clutch is disengaged to release the HEV mode when the speed of the motor is equal to or less than the determined clutch engagement impossible speed.