One embodiment is a method of operating an electronic control system (ECS) to control an engine to propel a vehicle. The method comprises receiving a throttle command, determining an operation to increase engine cycle efficiency by reducing engine torque below a magnitude corresponding to the throttle command and below a torque curve limit over a first vehicle operation segment and permitting an increase in engine torque above the torque curve limit over a second vehicle operation segment, controlling the engine to output torque below the magnitude corresponding to the throttle command and below the torque curve limit over the first vehicle operation segment, and controlling the engine to output torque above the torque curve limit over the second vehicle operation segment in response to a second received throttle command and constrained by an extended limit on operation of the engine above the torque curve limit.

The present specification relates to a system and a method for preventing overheating of an axle in a construction equipment. A system for preventing overheating of an axle in a construction equipment is mounted in the construction equipment and transmits driving power of an engine to a wheel, and the system includes: a brake pedal; a brake sensor which detects displacement of the brake pedal when the brake pedal is manipulated by an operator; an exhaust brake which is mounted in the engine and operates and controls an opening degree of an exhaust gas discharge passageway of the engine; and a control unit which adjusts the opening degree of the exhaust gas discharge passageway by controlling the exhaust brake corresponding to the displacement of the brake pedal when manipulation of the brake pedal is detected by the brake sensor.

A vehicle control device includes a motor, a clutch and a control unit. The motor is configured to apply torque to a power transmission path between an engine and a drive wheel. The clutch is disposed between the engine and the drive wheel. The control unit stops fuel injection of the engine when the engine is greater than or equal to a prescribed engine rotational speed during deceleration, and restarts the fuel injection after disengaging the clutch, and then stops the power running of the motor after resuming the fuel injection of the engine. The control unit drives the motor to carry out power running such that a deceleration of the vehicle becomes less than or equal to a prescribed value when fuel injection of the engine is stopped.

A vehicle includes: a motive power generating device that includes a multi-cylinder engine and outputs driving power to a wheel; an exhaust gas control apparatus including a catalyst that removes harmful components of exhaust gas from the multi-cylinder engine; and a controller. The controller is configured to, upon request for raising the temperature of the catalyst during load operation of the multi-cylinder engine, execute catalyst temperature raising control that involves stopping fuel supply to at least one of cylinders and supplying fuel to the other cylinders than the at least one cylinder, and to control the motive power generating device so as to cover a driving power shortage resulting from execution of the catalyst temperature raising control.

A hybrid vehicle includes a multi-cylinder engine, an exhaust gas control apparatus, an electric motor, an electricity storage device, and a controller. The controller is configured to control the electric motor so as to cover a driving power shortage resulting from execution of catalyst temperature raising control. The catalyst temperature raising control is control that involves stopping fuel supply to at least one of cylinders of the multi-cylinder engine and enriching air-fuel ratios for the other cylinders than the at least one cylinder.

Methods and systems are provided for calculating a fuel aging of fuel in a fuel tank. In one example, a method may include alerting a vehicle operator and/or adjusting engine operating parameters in response to a fuel aging being greater than a threshold aging.

A neutral coasting control (NCC) method based on fuel injection condition reinforcement applied to an NCC system is provided. The NCC method comprises in response to a controller detecting pressing of a brake pedal of a pedal system being switched to an NCC release from an operation, practice, or action of an NCC of a vehicle, fuel injection condition reinforcement control for delaying a fuel injection of a fuel injector. The delay of the fuel injection is according to a fuel injection stop condition for a predetermined time. The fuel injection delay is stopped according to a fuel injection stop abort condition and a fuel injection stop release condition. Fuel injection start control to stop or start the fuel injection according to a state of an engine overrun after transmission direct connection state is established such that improvement of fuel efficiency can be achieved by preventing an unnecessary fuel injection through delaying and limiting of the fuel injection start.

A hybrid electric vehicle control apparatus increases a speed of an engine in view of a speed of a drive motor when starting the engine, and turns on an engine clutch after identifying a self-operation of the engine, based on a disturbance torque, thereby rapidly synchronizing the engine speed and the drive motor speed and preventing waste of fuel, which in turn improves fuel efficiency.

A power-train controlling apparatus controls a power train of an engine electric hybrid vehicle. The power train is provided with an engine, a catalytic converter, an oxygen-level sensor, an engaging element, and an electric rotating machine. The power-train controlling apparatus includes a fuel injection controller, a catalyst diagnosing unit, and an engaging-element controller. The fuel injection controller stops fuel injection to the engine during coasting of the vehicle while the engaging element is engaged, introduces oxygen to the catalytic converter, and resumes the fuel injection in a fuel-rich state while the vehicle is running. The catalyst diagnosing unit diagnoses the catalytic converter after the resuming of the fuel injection. The engaging-element controller prohibits transition of the engaging element to a released state during a period between the stopping of the fuel injection and completion of the diagnosing of the catalytic converter.

A sobriety ignition interlock system including an engine control device and a method for managing available vehicle engine power using the sobriety ignition interlock system. The engine control device includes an engine control processor (ECP) that is electronically connected in between an engine control unit (ECU), an engine sensor assembly, and a sobriety processor. The sobriety processor determines a sobriety level of a vehicle driver and sends a corresponding sobriety signal to the ECP. The ECP intercepts an engine signal transmitted from the engine sensor assembly to the ECU and manipulates the engine signal according to the sobriety signal, in order to manage the available power of the vehicle engine.