Abstract: In a motor grader, controls for running the vehicle at a constant speed are provided when a work for improving a land surface with a blade is started by running a working vehicle at a low speed from the low idling start. With this operation, it is possible to perform the work for improving a land surface by maintaining an actual revolution speed of the engine 5 at a value obtained by subtracting a prespecified revolution speed from the revolution speed for low idling to run the working vehicle at a low speed. With this feature, it is possible to continue the work at a constant speed and also to prevent occurrence of engine stop during the work at a low speed, when a higher duty of the engine is required and the actual revolution speed drops like in the case where an ascending slope of the land to be improved becomes large or where the cutting rate temporally increases due to local irregularities of the land surface during the land surface improvement work.

Abstract: In the invention an apparatus and method direct an engine speed to converge to a target idle speed by detecting a current engine speed, calculating a dynamic reference speed based on the current engine speed, calculating a target idle speed actuator (ISA) opening based on the dynamic reference speed and the current engine speed, and actuating the ISA based on the target ISA opening.

Abstract: The present invention relate to idle control in an internal combustion engine and particularly to the control of the air supply to the engine during engine idling. An engine control unit (ECU) monitors the operation of ancillary consumer units to calculate an engine demand depending at least partly on the operation of these units. The ECU also monitors the engine idling speed to determine if the expected engine demand can be met at this engine idling speed. When the engine demand exceeds that available at the idling speed, the ECU determines a desired degree of opening of an air inlet valve to meet the expected engine demand. The ECU is arranged first to open the air inlet valve to a position at which the steady state airflow would exceed that necessary to meet the expected engine demand, and then closes the air inlet valve towards the calculated desired opening.

Abstract: An apparatus for controlling an internal combustion engine calculates a target indicated torque and determines operating degree for engine control actuators such as an air system, a fuel system and an ignition system. The target indicated torque for an idling condition of the engine is calculated based on a constant target indicated power, e.g. the constant target indicated power has a value that corresponds to or slightly overcomes internal and external loss when the engine is in the idling. Although an idling speed control with a feedback control method is inhibited during a transient condition of the engine, the constant target indicated power provides a self-stabilizing to maintain the engine speed constant. As a result, the apparatus maintain the engine speed constant during the idling even external disturbance is applied to the engine.

Abstract: A torque transfer system of a motor vehicle has a clutch, a transmission, a control device, and a traction load detecting device. The traction load is the variable resistance that a vehicle has to overcome to start or to keep moving, e.g., going uphill or downhill, with a heavy or light load, with or without a trailer or a roof load. The control device controls the torque transfer system, in particular the clutch, dependent on input signals received from the traction load detecting device.

Abstract: As a vehicle runs, current load q(t) is calculated every given time. The current load q(t) can be calculated by multiplying the amount of air taken into an engine of the vehicle by the engine speed. Added-up load Q(t) can be found by adding up the current load q(t) according to expression of Q(t)=Q(t−1)+((q(t)−Q(t−1))/a). If the added-up load Q(t) exceeds an inhibition determination value Z, idling stop is inhibited, so that overheating of the engine can be prevented appropriately.

Abstract: In the invention an apparatus and method direct an engine speed to converge to a target idle speed by detecting a current engine speed, calculating a dynamic reference speed based on the current engine speed, calculating a target idle speed actuator (ISA) opening based on the dynamic reference speed and the current engine speed, and actuating the ISA based on the target ISA opening.

Abstract: An apparatus and method control a negative pressure in an internal combustion engine equipped with a brake booster that uses a negative pressure produced on a downstream side of a throttle valve provided in an intake passage of the engine, as a power source for amplifying the pedal pressing force. A controller of the apparatus or method determines whether a negative pressure applied to the brake booster has reached a predetermined level when the internal combustion engine is started, and, if the negative pressure has not reached the predetermined level, increases an operating speed of the engine to a predetermined high speed and then keeps the throttle valve in a fully closed position during a period of time in which the engine proceeds to a steady-state operating mode.

Abstract: Multi-cylinder stationary internal combustion engine (1)—in particular a gas otto engine—with at least one throttle valve (13) and with at least one compressor (15)—in particular turbo-supercharger—for driving at least one generator (3) for the production of electric current or for driving at least one other consumer of mechanical energy, the internal combustion engine (1) containing a regulator (10) which, for the shedding of load, sets the throttle valve (13) to a permissible minimum-closure position which differs from the completely closed position and disconnects at least one cylinder (9) in order to prevent overspeed.

Abstract: A system and method for unthrottled intake air control for an internal combustion engine. The engine has at least one combustion chamber provided with electromagnetic intake means. The opening and closing times of the intake means are adjustable entirely independently from the crankshaft position to control intake air supplied to the combustion chamber. A control unit is used to implement instructions for determining a first portion of requested intake airflow, which first portion requests a first engine response performance, and instructions for determining a second portion of requested intake airflow, which second portion requests a second engine response performance.

Abstract: An idle speed control device for an internal combustion engine controls an idle speed of the internal combustion engine by at least one of an amount of intake air and an ignition timing during application of an external load. The control device calculates a target amount of air corrected by the external load, estimates a transient speed of the internal combustion engine when changing the amount of intake air to the target amount of air, and further corrects the amount of intake air or corrects the ignition timing on the basis of a difference between the estimated speed and the actual speed of the internal combustion engine at the timing when the speed is estimated, in such a manner as to reduce the difference. If the external load changes, the control device corrects the amount of intake air so as to maintain the engine speed, and prevents the engine speed from fluctuating due to a delay of response in such a case.

Abstract: An anti-rollback system for an automatic transmission includes an output gear connected to an output shaft of the automatic transmission, and a magnetic sensor for detecting output rpm of the output gear. The magnetic sensor is electrically connected to an. ECU (electronic control unit) and the output gear has a plurality of teeth, each tooth having a slot formed on its upper surface thereof.

Abstract: The present invention provides a system for running a diesel engine comprising an idle speedup switch, an uphill slope sensor, an accelerator pedal sensor, control means increasing an idle speed, when the idle speedup switch is on or the accelerator pedal is depressed on an uphill slope to start movement of a vehicle in an idle state, to a predetermined level greater than a given idle speed such that an amount of air supply increases and operating the engine in accordance with the increased amount of air supply, and a turbocharger providing air to the engine.

Abstract: An engine control method for reducing emissions during cold start and idling is provided, which includes: opening an ISA with a predetermined opening rate such that an air/fuel ratio becomes higher than a stoichiometric air/fuel ratio, and minimizing an engine load caused by an automatic transmission; performing air/fuel ratio control and ignition timing control based on engine speed and engine load, and controlling an amount of fuel injected in consideration of a quantity of wetting fuel; and determining an air flow rate according to an engine speed and coolant temperature, and performing air/fuel ratio control and ignition timing control to control an engine speed fluctuation.

Abstract: The present invention provides a system for running a diesel engine comprising an idle speedup switch, an uphill slope sensor, an accelerator pedal sensor, control means increasing an idle speed, when the idle speedup switch is on or the accelerator pedal is depressed on an uphill slope to start movement of a vehicle in an idle state, to a predetermined level greater than a given idle speed such that an amount of air supply increases and operating the engine in accordance with the increased amount of air supply, and a turbocharger providing air to the engine.

Abstract: An idle speed control device for an internal combustion engine controls an idle speed of the internal combustion engine by at least one of an amount of intake air and an ignition timing during application of an external load. The control device calculates a target amount of air corrected by the external load, estimates a transient speed of the internal combustion engine when changing the amount of intake air to the target amount of air, and further corrects the amount of intake air or corrects the ignition timing on the basis of a difference between the estimated speed and the actual speed of the internal combustion engine at the timing when the speed is estimated, in such a manner as to reduce the difference. If the external load changes, the control device corrects the amount of intake air so as to maintain the engine speed, and prevents the engine speed from fluctuating due to a delay of response in such a case.

Abstract: Engine speed and/or vehicle velocity limitation apparatus of engine-driven motor vehicles, wherein a controller defines, as a function of the difference between an actual speed value or actual velocity value as controlled variable, on the one hand, and a speed limit value or velocity limit value or a speed limit function or velocity limit function, on the other hand, a torque setpoint for the engine of the motor vehicle as the manipulated variable. As a result, the combustion processes occur at the stoichiometric ratio even during the limiting operation, and the elimination of torque surges results in a considerable increase in drivability for the driver.

Abstract: A system and method for unthrottled intake air control for an internal combustion engine. The engine has at least one combustion chamber provided with electromagnetic intake means. The opening and closing times of the intake means are adjustable entirely independently from the crankshaft position to control intake air supplied to the combustion chamber. A control unit is used to implement instructions for determining a first portion of requested intake airflow, which first portion requests a first engine response performance, and instructions for determining a second portion of requested intake airflow, which second portion requests a second engine response performance.

Abstract: The disclosed control apparatus and method of an engine of the present invention calculates a target engine torque using an operation amount of an accelerator, converting the target engine torque into a first opening area of a throttle valve, calculates a required air amount at the time of idling, converting the required air amount into a second opening area of the throttle valve, calculates a target total opening area of the throttle valve by adding the first opening area and the second opening area of the throttle valve, calculates a target opening degree of the throttle valve in correspondence to the target total opening area, and outputs the target opening degree to the throttle valve controller which controls an opening degree of the throttle valve.

Abstract: The present invention includes preventing an engine from stalling at a preselected low idle range during operation of a work machine. To accomplish this, a controller is located within a tachometer and disposed on the work machine. The controller is responsive to a first specified low idle RPM signal from the engine. The controller converts the RPM signal to an electrical signal that is directed to a relay. The relay is responsive to the electrical signal to automatically switch at least one device operating on the work machine from a first power output level to a second power output level lower than the first power output level. The controller is responsive to a second specified low idle RPM signal from the engine and converts it to another electrical signal.