JP2011190770A - Vehicular controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To aim at increasing an updating frequency of a learnt value important to perform learning control essential to practice a high-precision idle-speed control. <P>SOLUTION: There is provided a vehicular controller equipped with an idle-speed control means. The idle-speed control means includes a learning control means for performing the learning control of the learnt value in the idle-speed control of an engine, a decision means for deciding which values are large between an engine revolution speed at the time of having detected that the vehicle speed is zero in an idling operation of the engine by a vehicle speed detection means and a value created by adding a certain value to a target engine revolution speed, and an updating means for updating the learnt value used for the learning control means depending on the decided result by the decision means. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle control device, and more particularly to a vehicle control device that can increase the frequency of updating a learned value that is important in performing learning control of idle rotation speed control.

Some vehicles are equipped with a vehicle control device including an idle rotation speed control means in order to stabilize the engine rotation speed during idling operation of the mounted engine at a constant rotation speed. For vehicles equipped with an engine for controlling the idle speed, the engine is stopped (idle stop) when the automatic stop condition is satisfied, and the stopped engine is restarted when the automatic start condition is satisfied. Some have automatic stop / start control means.
In a vehicle that automatically stops and starts such an engine,
(1). There is basically no engine operation in the idle state.
(2). There is no operating condition at a constant engine speed during idling.
Due to a load change caused by temperature adjustment by an air conditioner, there is no idle state at a constant engine speed.
The driving situation is.
The vehicle control device is the above 1). 2). Under the condition that there is no time (idle operation) during which the engine is operated at a constant rotational speed, fine adjustment is made to stabilize the engine rotational speed of idle operation to the target engine rotational speed. There is no time to adjust the speed control (ISC).
Since the idle air amount is not adjusted, the vehicle control device stabilizes the engine rotation speed at the target engine rotation speed when it is necessary to maintain the target engine rotation speed (requires idle operation). Since the idle air amount for adjusting is not adjusted, the engine rotation speed may increase or decrease. When maintaining the target engine speed, that is, when the engine is not automatically stopped (idle stop), there is a case where a malfunction or failure has occurred in the engine.

More specifically, in a vehicle control apparatus that controls idle rotation speed of an engine that is automatically controlled to start and stop, the relationship among the vehicle speed, engine rotation speed, and idle air amount is shown in FIGS. It has transitioned to.
As shown in FIG. 6, the vehicle control device confirms that the vehicle speed Vs is zero when the vehicle speed Vs = zero (0 km / h) permitting automatic engine stop (idle stop) after the vehicle is decelerated (t1). Then, after verifying the situation such as the hydraulic pressure of the transmission (time = B), an engine stop signal is output (t2).
When the engine stop signal = ON (A Point), the vehicle control device determines that the engine speed (Ne) and the target engine speed Ntrgt are:
It is determined whether the target engine rotational speed + a constant value α <the engine rotational speed is satisfied, or the target engine rotational speed + the constant value α> the engine rotational speed.
At this time, the vehicle control device adjusts the idle air amount so that the target engine speed is reached when the vehicle speed Vs is zero. In FIG. 7, the idle air amount is decreased. When the engine stop signal is turned ON, the idle air amount becomes the flow rate at the time of engine start.
Originally, the learning of idle speed control is performed so that the feedback correction coefficient is centered in a state where the engine speed is stable within a specific time within the target engine speed ± β (β = dead zone). It is corrected with.
However, when the engine stops automatically, the learning value for idle speed control cannot be updated because the engine speed stays stable in β (dead zone) and there is no time for stabilization (idle operation). The constant is memorized.
When the learning value is not updated from the initial setting constant value, it is better not to stop the engine automatically (for example, when a malfunction or failure such as an engine or CVT (continuously variable transmission) occurs) When it becomes necessary to control to the target engine rotation speed for driving, the engine rotation speed may rise or drop.

In order to deal with such inconveniences, the conventional vehicle control device automatically stops the engine until the update value of the learning value in the learning control of the idle rotation speed control exceeds a predetermined value and it is determined that the update is completed. By limiting, there are those that reliably achieve the update of learning control. (Patent Document 1)
The conventional vehicle control device permits intermittent operation of the engine (automatic stop start) when the learning of the engine idle speed control amount is not completed, and the shift lever is in the parking position, and the shift lever There is one that secures an opportunity for learning the idle rotation speed control amount by prohibiting intermittent engine operation when in the drive position. (Patent Document 2)
In a conventional vehicle control device, when the amount of change in the learning value of engine knocking learning control is large, idle rotation speed learning control is performed in a learning acceleration mode in which idle rotation speed learning control is rapidly executed. In some hybrid vehicles, idle rotation speed learning control that is performed during idle operation is completed in a short time. (Patent Document 3)
In the conventional vehicle control device, the engine is temporarily stopped when the engine is warmed up and the vehicle can be learned and the braking device operates and the vehicle speed satisfies the condition of the set vehicle speed or less. Is prohibited, and the idle rotation speed learning control of the engine that is intermittently operated is executed while avoiding the deterioration of the fuel consumption without shocking the driver. . (Patent Document 4)

JP 2002-266684 A JP 2006-266193 A JP 2007-154875 A JP 2009-40234 A

  However, the vehicle control devices described in Patent Documents 1 to 4 prohibit or limit automatic engine stop and perform learning control of idle rotation speed control, or rapidly perform learning control of idle rotation speed control. As a result, the opportunity to update the learning value can be secured, but the opportunity to automatically stop the engine is lost, resulting in an increase in fuel consumption. There is a problem that the accuracy of learning control is impaired because time cannot be secured.

  An object of the present invention is to increase the frequency of updating a learning value that is important in performing learning control that is indispensable for carrying out highly accurate idle speed control.

  The present invention provides an engine rotation speed detection means for detecting an engine rotation speed of an engine mounted on a vehicle, a vehicle speed detection means for detecting a vehicle speed of the vehicle, and the engine rotation speed detection means when the engine is idling. In a vehicle control device comprising: an idle rotation speed control unit that controls the engine rotation speed that has been set to a target engine rotation speed, the idle rotation speed control unit learns and controls a learning value for idle rotation speed control of the engine. A learning control means, a value of the engine speed at the time of detecting that the vehicle speed is zero by the vehicle speed detecting means during the idling operation of the engine, and a value obtained by adding a constant value to the target engine speed Determining means for determining which value is greater, and depending on the determination result of the determining means , Characterized in that it comprises updating means for updating the learning value to be used for the learning control means.

  The vehicle control device according to the present invention provides either the value of the engine rotational speed at the time of detecting that the vehicle speed is zero during idling of the engine or the value obtained by adding a constant value to the target engine rotational speed. Since the learning value is determined according to the determination result and whether or not the value is large, the learning value is important in performing learning control that is indispensable for performing highly accurate idle rotation speed control. It is possible to increase the frequency of updates.

It is a flowchart of the control apparatus for vehicles. (Example) It is a block diagram of a control device for vehicles. (Example) It is a figure which shows the relationship between the vehicle speed, engine speed, and idle air amount when the value of engine speed at the time of deceleration of a vehicle is larger than the value which added the constant value (alpha) to target engine speed. (Example) It is a figure which shows the relationship between the vehicle speed, engine speed, and idle air quantity when the value of engine speed at the time of deceleration of a vehicle is smaller than the value which added the constant value (alpha) to target engine speed. (Example) It is a figure which shows the relationship between a vehicle speed and an engine speed when the load of an air conditioner changes. (Modification) It is a figure which shows the relationship between the vehicle speed and engine rotation speed at the time of deceleration of a vehicle. (Conventional example) It is a figure which shows the relationship between the vehicle speed which expanded the arrow A part of FIG. 6, the engine speed, and the idle air amount. (Conventional example)

  Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention. In FIG. 2, 1 is a vehicle and 2 is an engine mounted on the vehicle 1. The engine 2 includes a fuel injection valve 3 for injecting fuel, an igniter 4 for causing a spark plug to ignite, a starter motor 5 for cranking the engine 2, an idle control valve 6 for adjusting the amount of idle air, and the like. The operation of the engine 2 is controlled by the control means 8 of the vehicle control device 7.
The control means 8 of the vehicle control device 7 includes an ignition switch 9 for the engine 2, a throttle opening detection means 10 for detecting the opening degree of the throttle valve of the engine 2, and a brake switch for detecting the depression state of the brake pedal of the vehicle 1. 11, an engine rotation speed detection means 12 for detecting the engine rotation speed of the engine 2 and a vehicle speed detection means 13 for detecting the vehicle speed of the vehicle 1 are connected. The control means 8 controls the operating state of the engine 2 based on various signals input from the ignition switch 9 to the vehicle speed detection means 13 or the like.
The control means 8 of the vehicle control device 7 includes an automatic stop / start control means 14. The automatic stop start control means 14 stops the operation of the fuel injection valve 3 and the igniter 4 when the vehicle 1 satisfies the automatic stop condition such as when the vehicle 1 is stopped (the vehicle speed is zero) while the engine 2 is operating. When the operating engine 2 is stopped and an automatic start condition such as a start operation is satisfied while the engine 2 is automatically stopped, fuel injection is performed while the stopped engine 2 is cranked by the starter motor 5. The valve 3 and the igniter 4 are actuated to start again, and the engine 2 can be automatically stopped or started without operating the ignition switch 9.
Further, the vehicle control device 7 includes an idle rotation speed control means 15. The idle rotation speed control means 15 connects the engine rotation speed detection means 12 that detects the engine rotation speed of the engine 2 and the vehicle speed detection means 13 that detects the vehicle speed of the vehicle 1. The idle rotation speed control means 15 controls the engine rotation speed Ne detected by the engine rotation speed detection means 12 to converge to the target engine rotation speed Ntrgt when the engine 2 is idling.
The idle rotation speed control unit 15 includes a learning control unit 16, a determination unit 17, and an update unit 18. The learning control means 16 performs learning control of a learning value for idle rotation speed control of the engine 2. The determination means 17 is a value of the engine speed Ne at the time when the engine 2 is idling and the vehicle speed detection means 13 detects that the vehicle speed Vs is zero (Vs = 0 km / h), and the target engine speed. It is determined which value is larger, the value obtained by adding a constant value α to Ntrgt. The updating unit 18 updates the learning value used for the learning control unit 16 according to the determination result of the determining unit 17.

Next, the operation of the vehicle control device 7 will be described with reference to FIG.
When the control is started (S01), the vehicle control device 7 determines whether the engine 2 is idling and the vehicle speed Vs is zero (S02). In this determination (S02), it is determined whether a learning value update condition for idle rotation speed control is satisfied.
If this determination (S02) is NO, the engine is not idling, so the control to set the engine speed Ne to the target engine speed Ntrgt is not performed, and the control ends (S08). If this determination (S02) is YES, since it is an idle operation, it is determined whether or not the condition that the engine rotation speed Ne is within the target engine rotation speed ± β (β = disturbance zone) is satisfied (S03).
If this determination (S03) is YES, the learning value reflecting the value of the idle rotation speed control is updated (S04), and the control is terminated (S08). If this determination (S03) is NO, it is determined whether the value of the engine speed Ne is greater than a value obtained by adding a constant value α to the target engine speed Ntrgt (S05).
If this determination (S05) is YES (target engine speed + constant value α <engine speed), the constant amount C is subtracted from the current learning value and updated to a new learning value (S06), and control is performed. The process ends (S08). If this determination (S05) is NO (target engine rotational speed + constant value α> engine rotational speed), a constant amount D is added to the current learned value to update it to a new learned value (S07), and control is performed. The process ends (S08).

The operation of the vehicle control device 7 will be described with reference to FIGS.
After the vehicle is decelerated, the vehicle control device 7 has a vehicle speed Vs = zero (0 km / h) that permits automatic stop (idle stop) of the engine 2 (t1), and after confirming that the vehicle speed Vs is zero, the hydraulic pressure of the transmission After verifying the situation (time = B), an engine stop signal is output (t2).
When the engine stop signal = ON (A Point), the vehicle control device 7 determines that when the relationship between the engine rotational speed Ne and the target engine rotational speed Ntrgt + α is the target engine rotational speed + the constant value α <the engine rotational speed, As shown in FIG. 3, it is determined that the idle air amount should be subtracted during the time “B” from when the vehicle speed Vs is zero (= 0 km / h) to when the engine stop signal = ON (A Point). The value is updated by subtracting “C” L / min. Accordingly, the vehicle control device 7 reduces the idle air amount so as to reduce the rotational speed when the vehicle speed Vs is zero (0 km / h). The time “B” is a time during which it is diagnosed whether the vehicle speed Vs becomes zero (0 km / h) and the engine 2 may be stopped (idle stop).
On the other hand, when the engine stop signal = ON (A Point), the vehicle control device 7 determines that the relationship between the engine rotational speed Ne and the target engine rotational speed Ntrgt + α is: target engine rotational speed + constant value α> engine rotational speed. In this case, as shown in FIG. 4, the idle air amount should be added at a low rotational speed during the time “B” from the time when the vehicle speed is zero (0 km / h) to the time when the engine stop signal = ON (A Point). The learning value is updated by adding “D” L / min. As a result, the vehicle control device 7 adds the idle air amount in an attempt to increase the rotational speed when the vehicle speed is zero (0 km / h). The time “B” is a time during which it is diagnosed whether the vehicle speed is zero (0 km / h) and the engine 2 may be stopped (idle stop).
By updating the learning value in this way, the vehicle control device 7 can suppress the engine speed from rising or dropping when the engine 2 is not stopped (idle stop). The timing to be reflected in the learning value is a value that is added or subtracted when the engine 2 is stopped (idle stop) next time.

Thus, the vehicle control device 7 confirms the stop of the vehicle 1 (vehicle speed = 0 km / h) and confirms the vehicle speed = 0 km / h when the vehicle 1 decelerates and stops once after the vehicle 1 travels. Thereafter, a stop command (engine stop signal) of the engine 2 is sent to the engine 2 and the automatic stop / start control means 14. The automatic stop / start control means 14 that has received a command to stop the engine 2 determines whether or not the engine 2 in idle operation can be stopped. The idle rotation speed control means 15 learns the learning value of the idle rotation speed control of the engine 2 by the learning control means 16 at the time B during the determination.
The idle rotation speed control means 15 uses the determination means 17 to update the learning value so that the value of the engine rotation speed Ne immediately before the stop of the engine 2 is a value obtained by adding a constant value α to the target engine rotation speed Ntrgt. Diagnose whether it is “+” or “−”.
The idle rotation speed control means 15 subtracts or adds a fixed amount from the learning value by the update means 18 according to the determination result of the determination means 17. When the value of the engine speed Ne is “+” with respect to the value obtained by adding the constant value α to the target engine speed Ntrgt, the updating unit 18 subtracts the constant amount C from the learning value. Further, when the value of the engine rotational speed Ne is “−” with respect to the value obtained by adding the constant value α to the target engine rotational speed Ntrgt, the updating unit 18 adds the constant amount D to the learning value. The update means 18 increases when the engine rotational speed Ne immediately before the engine 2 stops reaches a value obtained by adding a constant value α to the target engine rotational speed Ntrgt (target engine rotational speed + constant value α = engine rotational speed). Do not change.

Therefore, the vehicle control device 7 adds a constant value α to the value of the engine rotational speed Ne and the target engine rotational speed Ntrgt at the time of detecting that the vehicle speed Vs is zero while the engine 2 is idling. Since the learning value is updated according to the determination result, it is necessary to perform learning control that is indispensable for performing highly accurate idle rotation speed control. It is possible to increase the frequency of updating the learning value, which is important.
The vehicle control device 7 stops the engine 2 that is operating when the automatic stop condition is satisfied, and restarts the stopped engine 2 when the automatic start condition is satisfied. Since the automatic stop / start control means 14 is provided, it is possible to increase the number of times of update of the learning value for learning control of the idle rotation speed control, which decreases by the execution of the automatic stop / start control (idle stop control).

In the vehicle control device 7 of the above-described embodiment, the present invention is applied to the update of the learning value of the idle rotation speed control of the engine 2 that is controlled to start and stop automatically. Can also be applied. As an auxiliary machine having a large load change, for example, there is an air conditioner having an air conditioner compressor driven by engine power. When the load of the air conditioner changes in a short time due to the influence of the outside air temperature, it can be applied to update the learning value of the idle rotation speed control.
In the air conditioner, when the difference between the outside air temperature and the air conditioner set temperature is small, the air conditioner compressor is repeatedly turned on and off. Also in this case, the learning value cannot be updated because the time during which the engine speed converges within the dead zone of the target engine speed during idle operation is too short. Due to the fact that the learning value cannot be updated and the engine speed changes due to repeated changes in the load of the air conditioner, there is a problem that the engine speed increases and drops when the target engine speed changes.
In order to solve such a problem, as shown in FIG. 5, the vehicle control device 7 uses a learning value when the air conditioner is turned off (E Point) from the engine rotational speed just before the target engine rotational speed is switched. The learning value is updated when the air conditioner is turned on (F Point).
When the air conditioner is turned off (E Point), the vehicle control device 7 determines that the relationship between the engine rotational speed Ne and the target engine rotational speed Ntrgt + the constant value α is from the engine rotational speed just before the target engine rotational speed is switched. When engine speed + fixed value α <engine speed, the learning value is updated by subtracting “C” L / min. As a result, the vehicle control device 7 reduces the idle air amount so as to reduce the rotational speed when the air conditioner is OFF.
On the other hand, when the air conditioner is turned on (F Point), the vehicle control device 7 determines that the relationship between the engine rotational speed Ne and the target engine rotational speed Ntrgt + α is from the engine rotational speed just before the target engine rotational speed is switched. When the rotational speed + the constant value α> the engine rotational speed, the learning value is updated by adding “D” L / min. As a result, the vehicle control device 7 adds the idle air amount in an attempt to increase the rotational speed when the air conditioner is ON.
By updating the learning value in this way, the vehicle control device 7 can suppress the engine speed from rising and falling due to repeated changes in the load of the air conditioner.

  The vehicle control device of the present invention can increase the frequency of updating the learning value of idle rotation speed control, and can provide an engine that is automatically stopped and started, and auxiliary equipment that has a large load change such as an air conditioner. It can also be applied to an engine equipped.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Engine 3 Fuel injection valve 4 Igniter 5 Starter motor 6 Idle control valve 7 Vehicle control device 8 Control means 9 Ignition switch 10 Throttle opening detection means 11 Brake switch 12 Engine rotation speed detection means 13 Vehicle speed detection means 14 Automatic stop Start control means 15 Idle rotation speed control means 16 Learning control means 17 Determination means 18 Update means

Claims (2)

Engine rotation speed detection means for detecting the engine rotation speed of the engine mounted on the vehicle;
Vehicle speed detecting means for detecting the vehicle speed of the vehicle;
In a vehicle control device comprising: an idle rotation speed control unit that controls an engine rotation speed detected by the engine rotation speed detection unit during idle operation of the engine to a target engine rotation speed;
The idle rotation speed control means includes
Learning control means for learning and controlling a learning value of idle speed control of the engine;
Either the value of the engine speed at the time of idling of the engine and when the vehicle speed detecting means detects that the vehicle speed is zero, or a value obtained by adding a constant value to the target engine speed is larger. Determining means for determining whether or not
A vehicle control apparatus, comprising: an updating unit that updates a learning value used for the learning control unit in accordance with a determination result of the determination unit.   When the automatic stop condition is satisfied, the engine being operated is stopped, and when the automatic start condition is satisfied, an automatic stop start control means is provided for restarting the stopped engine. The vehicle control device according to claim 1.

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