JP4951610B2 - Operation control device for internal combustion engine - Google Patents

Description

  The present invention relates to an operation control apparatus for an internal combustion engine, and more particularly, to a determination means for an operation stop condition for a vehicle that performs idle stop.

  There is a vehicle that performs idle stop for the purpose of reducing fuel consumption and exhaust of an internal combustion engine. During the idle stop, the electric load is covered by the energy stored in the power storage means. When the remaining power of the power storage means falls below a predetermined value, the internal combustion engine is started and the generator is driven to supply the electric load. . There is known a technique for accurately measuring the remaining power of the power storage means by stopping the power generation means during operation of the internal combustion engine when the idle stop condition is satisfied.

JP 2004-150354 A

  The problem to be solved by the present invention is that a vehicle equipped with an electric load that consumes a large amount of current, such as audio and television, without using an operating state detection means, has unexpectedly high power consumption after an idle stop, Therefore, it is to realize a system that does not perform idle stop with poor operability such as restarting in a short time.

  By utilizing the fact that the electric load current can be measured by the discharge current of the power storage means while the power generation means is stopped, the operation control device for the internal combustion engine according to the present invention is capable of storing the power estimated by the operating state detection means while the power generation means is stopped. When the detected discharge current is larger than the discharge current of the means, there is provided means for correcting the determination threshold value of the operation stop condition to the side not to stop.

  According to the present invention, in order to correct the idle stop determination threshold according to an electric load that consumes a large amount of current such as audio or television retrofitted by the user, the discharge of the power storage means proceeds in a short time and the internal combustion engine is restarted. Deterioration of drivability can be prevented.

  An embodiment of an internal combustion engine applied to an operation control apparatus according to the present invention will be described with reference to the drawings. In FIG. 1, the internal combustion engine 1 is an engine 1 mounted on, for example, an automobile. In the following description, the internal combustion engine 1 may be referred to as the engine 1. The engine 1 includes a rotation detection device, a water temperature detection device, an air flow rate device, a fuel injection device, an ignition device, and the like, and operates according to a command from an ECM 2 that is an operation control device 2 of the engine 1.

  The ECM 2 starts the engine 1 with a signal from the start switch 3 and controls the engine 1 so that torque according to the operation of the accelerator pedal 4 is generated.

  The state of the battery 5 is detected by the battery sensor 6 that detects the current, voltage, and temperature provided in the battery 5 that is the power storage means 5, and the generated voltage is instructed to the alternator 7 that is the power generation means 7 driven by the engine 1. .

  The ECM 2 calculates the magnitude of the electric load from the operation switch signal information of the electric load 8 such as a headlight and a rear window heat ray, and compares the state with the state of the battery 5 to determine whether idling can be stopped.

  The ECM 2 depresses the brake pedal 9 and, when the vehicle speed obtained from the ATCU 11 that controls the transmission 10 via the CAN 12 of the communication means is 0 and the electrical load is capable of idling stop, the ECM 2 determines idling stop and sends fuel to the fuel injection device. Cut is instructed and the engine 1 is stopped.

  The ATCU 11 calculates a gear ratio command based on information from the ECM 2 obtained via the shift lever 13 and the CAN 12 of the communication means.

  The control flow in the ECM 2 of the present invention will be described with reference to FIG.

  In this embodiment, it is activated and executed every 10 milliseconds.

  In the input process (step 100), the signals of the start switch 3, the accelerator pedal 4, the battery sensor 6, the electric load 8, and the brake pedal 9 are captured.

  In the power generation system control (step 101), a power generation voltage instruction is issued to the alternator 7 depending on the state of the battery 5 and the electric load 8.

  The processing of I / S control (step 102) is shown in FIG.

  In the electric load estimation (step 200), the magnitude of the electric load is estimated from the operation switch signal information such as the headlight and the rear window heat ray as the electric load 8.

  If the power generation means 7 is turned off (step 201), the current detected by the battery sensor 6 is used as the current of the electric load 8 in the electric load detection (step 202).

In the determination value correction (step 203), the determination threshold of the electric load 8 used in the idle stop determination (step 204) is detected from the battery discharge current estimated in the electric load estimation (step 200) (step 202). When the discharge current of the battery detected in (1 ) is larger , the correction is made so that the idle stop is not performed.

  In the I / S determination (step 204), the electric load estimated in the electric load estimation (step 200) does not satisfy the determination value of the determination value correction (step 203), the brake pedal 9 is depressed, and the previous CAN communication process ( If the vehicle speed is 0 in step 106), the fuel injection is stopped as an idle stop.

  In the starter control (step 205), if the engine 1 is not completely exploded in the determination that the idle stop is not performed in the I / S determination (step 204), the starter 14 is energized. Otherwise, the starter 14 is instructed. Instruct de-energization.

  Returning to the air system control (step 103) of the control flow of FIG.

  Based on the information acquired in the input processing (step 100) and the I / S determination (step 204), the air system control (step 103) adjusts the throttle opening, and the injection amount (in step 104) is an injector. In the injection time, the fuel injection amount and the ignition timing control (step 105) optimally control the plug ignition timing.

  In the CAN communication process (step 106), information transmission / reception such as reception of vehicle speed information from the ATCU 11 is performed by CAN communication.

1 is a schematic configuration diagram showing an operation control device for an internal combustion engine according to an embodiment of the present invention. The flowchart which shows the outline | summary of the operation control method of the internal combustion engine which concerns on one Embodiment of this invention. The flowchart which shows the outline | summary of the process of I / S control which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Internal combustion engine, Engine 2 Operation control device 3 Start switch 4 Accelerator pedal 5 Power storage means, battery 6 Battery sensor 7 Power generation means, alternator 8 Electric load 9 Brake pedal 10 Transmission 11 ATCU
12 CAN
13 Shift lever 14 Starter

Claims (1)

Power generation means driven by an internal combustion engine;
A storage means which is charged by said power generating means,
Current detection means for detecting a discharge current of the power storage means;
An electrical load driven by the energy of the power storage means or the power generation means;
An operating state detecting means for estimating an electric load as a discharge current of the power storage means ;
Means for determining an operation stop condition of the internal combustion engine by comparing at least a discharge current estimated by the operating state detection means and a threshold value ,
If the discharge current the operating state detecting means during stopping of said power generating means is detected by said current detecting means than the discharge current value you estimate is large,
An operation control device for an internal combustion engine, wherein the threshold value of the determination unit for the operation stop condition is corrected so as not to stop.

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