Method and arrangement for controlling the fuel metered in a diesel engine
First Claim
1. An arrangement for making a fuel metering signal (M) available in a diesel engine starting with measured variables such as accelerator pedal position, engine speed, lambda, exhaust gas temperature, and torque, the arrangement comprising:
- a precontrol characteristic field (50) for emitting a signal representing a precontrol value (MV) in dependence upon at least said engine speed;
a driving-performance characteristic field (30) for emitting a fuel-quantity request signal (MW) in dependence upon at least said accelerator pedal position;
a minimum selector (15) for supplying an output signal for determining the metering of fuel to the engine;
means for applying said signal representing said precontrol value (MV) and said fuel-quantity request signal (MW) to said minimum selector (15);
means for limiting said fuel-quantity request signal (MW) to said precontrol value; and
,a controller (60);
means for causing said controller (60) to make a signal (MR) available for correcting said precontrol value (MV) for specific operating conditions of the engine in at least one of the following ways;
additively and multiplicatively.
1 Assignment
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Accused Products
Abstract
The invention relates to a method and arrangement for preparing a fuel-metering signal M for a diesel engine starting with measured variables such as accelerator pedal position, rotational speed, lambda, exhaust gas temperature or torque. A fuel quantity request MW is pregiven in dependence upon the position of the accelerator pedal. This quantity request MW is supplied to a minimum selector together with a second signal. The output signal M of the minimum selector, in turn, determines the metered fuel. The second signal derives from a precontrol characteristic field 50 in dependence upon the speed. The output signal of the precontrol characteristic field MV is influenced by the controller output signal MR in specific operating conditions.
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Citations
18 Claims
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1. An arrangement for making a fuel metering signal (M) available in a diesel engine starting with measured variables such as accelerator pedal position, engine speed, lambda, exhaust gas temperature, and torque, the arrangement comprising:
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a precontrol characteristic field (50) for emitting a signal representing a precontrol value (MV) in dependence upon at least said engine speed; a driving-performance characteristic field (30) for emitting a fuel-quantity request signal (MW) in dependence upon at least said accelerator pedal position; a minimum selector (15) for supplying an output signal for determining the metering of fuel to the engine; means for applying said signal representing said precontrol value (MV) and said fuel-quantity request signal (MW) to said minimum selector (15); means for limiting said fuel-quantity request signal (MW) to said precontrol value; and
,a controller (60); means for causing said controller (60) to make a signal (MR) available for correcting said precontrol value (MV) for specific operating conditions of the engine in at least one of the following ways;
additively and multiplicatively.
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2. A method of making a fuel metering signal (M) available in a diesel engine starting with measured variables including accelerator pedal position, engine speed, lambda, exhaust gas temperature or torque, the method comprising the steps of:
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emitting a signal representing a precontrol value (MV) from a precontrol characteristic field (50) in dependence upon at least said engine speed; emitting a fuel-quantity request signal (MW) from a driving-performance characteristic field (30) in dependence upon at least said accelerator pedal position; applying said signal representing said precontrol value (MV) and said fuel-quantity request signal (MW) to a minimum selector (15) which, in turn, supplies an output signal for determining the metering of fuel to the engine; limiting said fuel-quantity request signal (MW) to said precontrol value (MV); and
,causing a controller (60) to make a signal (MR) available for correcting said precontrol value (MV) for specific operating conditions of said engine in at least one of the following ways;
additively and multiplicatively. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18)
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13. A method of making a fuel metering signal (M) available in a diesel engine starting with measured variables including accelerator pedal position, engine speed, lambda, exhaust gas temperature or torque, the method comprising the steps of:
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providing a first signal (MW) indicative of a preselected fuel-quantity request dependent upon accelerator pedal position; providing a second signal (MV) taken from a precontrol characteristic field (50) and dependent upon engine speed; applying said first and second signals (MW and MV) to a minimum selector which, in turn, supplies an output signal determining the metering of the fuel; influencing said second signal (MV) with the signal (MR) of a controller (60) with respect to a variable to be controlled during specific operating conditions; the values of the precontrol characteristic field (50) depending upon the air quantity (QL) drawn in by suction, said air quantity being arrived at by one of the following; measuring by means of an air-flow sensor and computing by means of a simulation; the air quantity (QL) being computed from the temperature (TL) and the pressure (PL) of the intake air wherein one of the following applies; (a) the pressure (PL) and the temperature (TL) are measured; (b) the course of the pressure is derived from the measured course of the temperature; and
,(c) the course of the temperature is derived from the measured course of the pressure; with the temperature signal being precontrolled in dependence upon the pressure signal (PL) in the case of a slow temperature sensor.
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Specification