Abstract: A method for controlling a delivery of driving torque of an engine of an agricultural tractor comprising a first step of monitoring a speed of said engine, and when said speed is stable, comprising a second step of maintaining it subsequently stable by compensating a load variation applied to the engine. The invention also concerns a fuel injection system implementing the above method.

Abstract: A control device for tuning a servo motor is suggested. The control device comprises a calculation unit configured to determine a current proportional speed gain of the servo motor and to calculate a stabilization time ratio based on a current stabilization time of the servo motor and a target stabilization time, a determination unit configured to select a gain determination process based on the calculated stabilization time ratio, to determine a next proportional speed gain using the selected gain determination process starting from the current proportional speed gain, wherein the calculation unit is further configured to update parameters of the servo motor according to the determined next proportional speed gain, and a control unit configured to generate a control signal for controlling the servo motor for driving a load based on the updated parameters.

Abstract: In a method for operating a valve, one valve element of the valve being able to be moved from a first position into a second position by activating an electrically actuatable actuator, the actuator is activated at least once in a first time interval, and is thereafter not activated in a second time interval, and a signal characterizing a strike of the valve element at the first position is ascertained at electrical terminals of the actuator. During the process, an activation energy of the actuator is gradually modified, and a threshold value of the activation energy at which the valve element is just able or is just no longer able to lift is ascertained.

Abstract: A control system for a turbo charged natural gas engine. A butterfly valve used for fuel control upstream of a carburetor provides non-linear flow response during opening and closing and a flow compensator compensates for the non-linear response. A throttle valve position sensor acts in association with a controller which compares the throttle valve position signal with a predetermined set point and thereby opens or closes the waste gate of the turbo charger which affects oxygen content in the exhaust. A compensator for a throttle valve used with electronic engine controllers is also provided.

Abstract: A machine engine idle speed control system may include an automated autoadaptive mode to supplement typical economy and normal power modes. The autoadaptive mode may afford an operator with an automated option to optimize fuel economy and lower engine/machine noise. The autoadaptive mode may initially default to a typical lower engine idle speed of the economy mode. However, as the machine workload rises, demands on the engine may become greater, and at a predetermined threshold of engine workload the engine idle speed may be automatically increased to a higher set point. The engine control may then remain at the higher idle speed until engine load is reduced to some predetermined target, and/or after a certain time period has elapsed. The time period may be controlled by a configurable delay timer to avoid unnecessary/undesirable cycling between modes. In addition, an operator may always intervene to increase or decrease engine idle speed.

Abstract: An ECU for controlling an engine counts an unused time TIM of engine in a low-temperature environment. If the unused time TIM is shorter than a predetermined reference value, the ECU sets idle speed immediately after start of operation of the engine to a first idle speed, and if the unused time TIM is longer than the reference value, sets the idle speed to a second idle speed higher than the first idle speed. If duration of the second idle speed exceeds a reference period determined by state of driving of the vehicle, the ECU sets the idle speed to be lower than the second idle speed. In this manner, increased vibration in idling operation in a low-temperature environment can be prevented.

Abstract: An engine control system comprises an engine speed control module and an idle limiting module. The engine speed control module selectively controls an engine based on an idle speed request. The idle limiting module selectively reduces the idle speed request by an amount that is based on a wheel slip value.

Abstract: A control system for a turbo charged natural gas engine. A butterfly valve used for fuel control upstream of a carburetor provides non-linear flow response during opening and closing and a flow compensator compensates for the non-linear response. A throttle valve position sensor acts in association with a controller which compares the throttle valve position signal with a predetermined set point and thereby opens or closes the waste gate of the turbo charger which affects oxygen content in the exhaust. A compensator for a throttle valve used with electronic engine controllers is also provided.

Abstract: A PI control strategy controls engine speed to an engine speed set-point. A proportional map (36) is populated with data values to be used in calculating the P component of the strategy. An integral map (38) is populated with data values to be used in calculating the I component. Each data value in the maps is correlated with a speed data value representing engine speed (N) and a speed error data value representing the difference between engine speed and engine speed set-point (N_DIF_MAX_LIM). Values for proportional and integral components are selected from the respective maps by processing current engine speed data and current engine speed error data. The strategy uses the values from the maps for controlling engine speed to the speed set-point. Data values from other maps (20 and 24; or 22 and 26) modify the selected values from the proportional and integral maps (36, 38) for transmission type, transmission gear, and engine temperature.

Abstract: This in particular involves testing the operation of a fuel vapor purge valve (31). The engine (1) is running at idle. An idle speed controller (ISC, 47) acts on the engine idle speed. At a given moment in this operation of the engine, a command to open the purge valve (31) is issued and the idle speed controller is also operated in such a way that it acts on this speed to keep it substantially constant in spite of the fact that the purge valve is open.

Abstract: An intake flow control apparatus for an internal combustion engine eases operation of an air flow regulator and permits use of a short intake passage, thus providing a high output. The intake flow control apparatus includes an air routing member having an intake passage formed therein, and an air flow regulator opposed to an upstream-side opening of the intake passage. The air flow regulator moves in an intake axis direction while being guided by a light-weight guide structure to control the amount of intake air supplied. The air flow regulator may include plural valve elements different in operation timing, in which a valve actuator successively actuates the plural valve elements in accordance with a throttle operation to control the amount of intake air. The apparatus also includes a vacuum moderating structure for reducing the effective strength of a vacuum applied to the air flow regulator.

Abstract: A method for controlling the speed of a torque-controlled internal combustion engine in which the generation of the drive torque is regulated by actuators which are controlled from a control value of the instantaneous torque and by a control value of the predicted torque, the method providing for the calculation of an objective value of the speed, the calculation of an objective value of the torque reserve, the calculation of an objective value of the potential torque on the basis of the objective value of the torque reserve, the generation of the control value of the instantaneous torque by means of a first feedback control loop which uses as input the objective value of the speed, and the generation of the control value of the predicted torque by means of a second feedback control loop which uses as input the objective value of the potential torque.

Abstract: An unstable idling state immediately after engine start is stabilized. The difference between a target idling engine speed corresponding to the cooling water temperature and an actual engine speed is integrated. The ignition timing is changed toward advance or retard while using a value obtained by multiplying the integration value of the engine speed difference with a gain, as an ignition timing changing amount. Immediately after engine start, the gain is made relatively large to rapidly increase engine speed. When the engine speed approaches the target engine speed, the gain is set to a smaller usual gain, and, in a change to the same advancing or retarding side, a change to an ignition timing in the same side is suppressed using a smaller advancing or retarding gain. In a throttle-off state, an ignition timing corresponding to the cooling water temperature is set to rapidly reduce engine speed.

Abstract: An engine and transmission control system is responsive to manipulation of manually operated control devices which can cause actions which result in increased load on the vehicle engine, before the engine actually begins to be effected by the load increase. The control system monitors manipulation of control devices and engine load, and when engine load decreases, the system stores the identity and displacement direction of the manipulated control device. When the same control device is then manipulated in the opposite direction, the control system will begin to temporarily boost or raise engine rpm and decrease the transmission ratio in anticipation of the expected load. After the control system has boosted the engine rpm, it monitors whether or not the engine speed was boosted high enough to prevent the engine speed from dropping below a threshold.

Abstract: To permit easy and adequate setting of a gain in an internal combustion engine (hereinafter be called an “engine”) for the surer stabilization of an idle speed, the present invention provides a device for controlling an air volume during an idle operation of the engine. This device is provided with a first estimation unit for estimating a current output torque correlation value corresponding to a present intake-air volume of the engine; a second estimation unit for estimating an output torque correlation value correction amount corresponding to a difference between a current engine speed and a target engine speed of the engine; a third estimation unit for estimating a target output torque correlation value based on the correlation value and the correction amount; and a control unit for controlling an intake-air-volume adjusting system of the engine to achieve an intake-air volume which is equivalent to the target output torque correlation value.

Abstract: An engine and transmission control system is responsive to manipulation of manually operated control devices which can cause actions which result in increased load on the vehicle engine, before the engine actually begins to be effected by the load increase. The control system monitors manipulation of control devices and engine load, and when engine load decreases, the system stores the identity and displacement direction of the manipulated control device. When the same control device is then manipulated in the opposite direction, the control system will begin to temporarily boost or raise engine rpm and decrease the transmission ratio in anticipation of the expected load. After the control system has boosted the engine rpm, it monitors whether or not the engine speed was boosted high enough to prevent the engine speed from dropping below a threshold.

Abstract: An internal combustion engine (1) is provided with a three-way catalytic converter (16) which purifies exhaust gas, a spark plug (6) which ignites a gaseous mixture and a throttle (11) which regulates an intake air flow rate. When the engine (1) is started, the ignition timing of the spark plug (6) is retarded based on the difference of the rotation speed Ne from a target idle rotation speed Net. If the engine rotation speed Ne is higher than the target idle rotation speed even after the ignition timing has reached a retard limit, the ignition timing is fixed to the retard limit and the intake air flow rate is reduced through the throttle (11), thereby forcing the engine rotation speed Ne to converge rapidly to the target idling rotation speed Net while maintaining the ignition timing at the retard limit to ensure rapid temperature increase in the converter (16).

Abstract: A method and system for generating an idle control signal for an internal combustion engine is disclosed. Rotational speed, n, of the engine is measured. Combustion generated torque &tgr;ind is estimated as a function of the measured engine rotational speed, n. The idle control signal for the engine is produced as a function of the difference between: (A) a time rate of change in such measured engine rotational speed, dn/dt, and; (B) the sum of the estimated combustion generated torque &tgr;ind and a function of an engine idle speed error. The idle speed error is representative of the difference between an idle speed set point and the measured rotational speed, n. Thus, idle speed control is achieved using only a feedback system which responds to measured operating conditions of the engine rather than with a combination of feedback and a feedforward model which relies on a model of each individual engine loss or load to calculate the resulting impact on the engine.

Abstract: In a method of controlling a drive unit, particularly an internal-combustion engine generator unit, in addition to first and second controlling devices, a third controlling device is provided for computing a third injection quantity. One of the controlling devices is set as dominant for controlling the rotational speed. From an operator determined charge definition, a charge injection quantity is computed, and is compared with the injection quantity of the dominant controlling device. As a function of the comparison, the dominance of the controlling device is retained or the charge definition is set to be dominant for a power-determining signal.

Abstract: In a method of controlling a drive unit, particularly an internal-combustion engine generator unit, in addition to first and second controlling devices, a third controlling device is provided for computing a third injection quantity. One of the controlling devices is set as dominant for controlling the rotational speed. From an operator determined charge definition, a charge injection quantity is computed, and is compared with the injection quantity of the dominant controlling device. As a function of the comparison, the dominance of the controlling device is retained or the charge definition is set to be dominant for a power-determining signal.

Abstract: A method of controlling the idle speed of an internal combustion engine including, in response to the engine speed being below a predetermined level: determining the rate of change of the speed of the engine; selecting an idle entry set-point as a function of said rate; and initiating idle speed control of the engine on the basis of said idle entry set-point to thereby control the engine speed to a base idle speed.

Abstract: A method and an arrangement for controlling an operating variable of a drive unit is suggested. A controller is provided, which has at least one changing parameter. A switchover from a first parameter value to a second parameter value takes place in dependence upon a switchover signal. A filter is initialized with a value at the switchover time point and this value corresponds to the magnitude of the change of the output signal of the controller at this time point and, with this value, a continuous trace of the controller output signal is achieved at the switchover time point.

Abstract: Within both a method for operating an internal combustion engine and a system for operating the internal combustion engine there is provided an engine rotation speed pulsation damping within the internal combustion engine through use of a PID controller which varies a single PID control parameter, particularly, KD to provide the engine rotation speed pulsation damping within the internal combustion engine. Within both the method and the system there is also provided a pair of control algorithms for use within the PID controller such as to effect the desired engine rotation speed pulsation damping when operating the internal combustion engine.

Abstract: The invention is directed to a method and an arrangement for the rpm control of a drive unit. A control is provided having at least two components. At the start of the drive unit, these two components are activated one after the other.

Abstract: A method of controlling an internal combustion engine having an electromagnetically actuated intake valve for a cylinder.

Abstract: A method of controlling the idle speed of an internal combustion engine including, in response to the engine speed being below a predetermined level: determining the rate of change of the speed of the engine; selecting an idle entry set-point as a function of said rate; and initiating idle speed control of the engine on the basis of said idle entry set-point to thereby control the engine speed to a base idle speed.

Abstract: When canister purge is started during feedback control of idle rotation speed, a feedback control value for immediately prior to starting purge is stored, and when purge is stopped, the feedback operating amount is changed stepwise up to the stored value.

Abstract: With an electronically controlled throttle type internal combustion engine, where a target opening of a throttle valve is set according to a required output of the engine, and the throttle valve is opened and closed with an actuator so as to obtain a target opening; air quantity learning for learning and correcting the target opening of the throttle valve so as to obtain a target intake air quantity is performed by comparing an intake air quantity estimated based on a detection value of the throttle valve opening and an actually detected intake air quantity, at the time of idling the engine. After completion of the air quantity learning, friction learning for learning and correcting the target opening of the throttle valve so as to obtain a target engine output is performed while feedback controlling the throttle valve opening so that the engine rotation speed approaches a target idle rotation speed, at the time of idling the engine.

Abstract: A system and method for controlling the speed of an engine, or a speed governor, receives an error signal indicative of the difference between the actual engine speed and a commanded engine speed. This error signal is passed through a linear controller that determines a fuel flow rate in units of volume per unit time. The fuel flow rate is a substantially linear function of engine speed, and more specifically engine speed error. The output of the linear controller is fed to a non-linear compensator that determines a fueling command signal as a non-linear function of actual engine speed and fuel flow rate. The speed governor can accurately control engine speeds at low idle conditions. In one embodiment, the non-linear compensator utilizes a three-dimensional table of fueling command values as a function of fuel flow rate and engine speed. In another embodiment, the compensator applies a transfer function utilizing low and high calibration speed values enveloping a low engine speed.

Abstract: A computer-implemented apparatus and method for inferring power steering load and for controlling airflow to an engine of a vehicle having an engine speed. A sensor which is connected to the engine senses the engine speed of the engine. An engine speed reference data table stores at least one engine reference speed, and a reference comparator module which is connected to the sensor and to the reference data table performs a comparison between the sensed engine speed and the engine reference speed. The airflow to the engine is controlled based upon the comparison.