JP2956209B2 - Idle speed control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an idle speed control device.

[Prior Art] Japanese Patent Application Laid-Open No. 59-158357 discloses that the engine speed is adjusted so that the conductivity of the field current becomes a predetermined value at the time of idling without causing overdischarge of the battery. There is disclosed a technique of improving fuel efficiency by operating in a low rotation range.

[Problems to be Solved by the Invention] However, the conventional technology has the following disadvantages.

In normal driving with a low idling ratio, the alternator can generate enough power during driving and fully charge the battery, but the idling speed is adjusted to keep the battery voltage at the specified voltage during idling. Is bad.

An object of the present invention is to provide an idle speed control device capable of preventing overdischarge of a battery and improving fuel efficiency.

[Means for Solving the Problems] To achieve the above objects, the present invention employs the following configurations.

(1) The idle speed control device is driven by an onboard engine to generate power, and a low power generation capacity state of an alternator for charging a battery that supplies power to an electric load, that is, when the vehicle is in an idle state, or Detecting means for detecting a case where the rotation speed of the alternator is equal to or lower than a predetermined value, integration means for integrating the time in the low power generation capacity state for each predetermined time, and actuator control means for controlling an actuator for adjusting the idle rotation speed; With
If the above integrated value is equal to or greater than the set value, the actuator control means outputs to the actuator so as to increase the idle speed.

(2) A battery that supplies power to the electric load of the vehicle, an alternator that is driven by an onboard engine to generate electric power and charges the battery, compares the battery voltage with a target voltage, and the battery voltage becomes the target voltage. And a regulator for switching the field current of the alternator to control the amount of power generated by the alternator. Duty detecting means for detecting when the alternator is in a low power generation capacity state, that is, when the vehicle is in an idle state or when the rotation speed of the alternator is equal to or less than a predetermined value, And an actuator for adjusting the idle speed. To to and a Akucheeta control means, if said integrated value is larger than a predetermined value, Akucheeta control means, conduction rate of the field current for controlling the actuator to be in the proper range.

[Actions and Effects of the Invention] (Regarding Claim 1) When the vehicle is in an idle state, or when the engine speed is slow and the speed of the alternator driven by the on-board engine to generate power is less than or equal to a predetermined value, the alternator is activated. The battery is in a low power generation capacity state, and the battery that supplies power to the electric load of the vehicle is almost discharged. The detecting means detects this low power generation capacity state. The integrating means integrates the time in the low power generation capacity state at predetermined time intervals. When the integrated value is equal to or larger than the set value (the ratio of the low power generation capacity state is large), the actuator control means outputs to the actuator for adjusting the idle speed to increase the idle speed.

When the ratio of the low power generation capacity state of the alternator increases, the idling speed is increased. Therefore, the power generation capacity of the alternator during idling increases, and the battery discharge state is eliminated.

When there are many high power generation capacity states, the battery can be sufficiently charged in the high power generation capacity state. In this case, since the idling speed is not increased, the fuel efficiency is improved accordingly.

(Regarding Claim 2) The regulator compares the battery voltage with the target voltage, and switches the field current of the alternator so that the battery voltage becomes the target voltage to control the power generation amount of the alternator. The duty detecting means detects the conductivity of the field current (the higher the discharge state of the battery, the higher the duty ratio). The detection means detects an idling state of the vehicle or a low power generation capacity state of the alternator that occurs when the rotation speed of the alternator is equal to or lower than a predetermined value. The integrating means integrates the time in the low power generation capacity state at predetermined time intervals. When the integrated value is equal to or larger than the set value, the actuator control means
The actuator is controlled so that the conductivity of the field current falls within an appropriate range.

When the rate of the low power generation capacity state of the alternator increases, the actuator is controlled such that the field current conductivity falls within an appropriate range. Therefore, the power generation capacity of the alternator during idling increases, and the battery discharge state is eliminated.

When there are many high power generation capacity states, the battery can be sufficiently charged in the high power generation capacity state, so that the idle speed is not changed. When the alternator is in a low power generation capacity state and the field current conductivity is within an appropriate range, the battery is not considered to be overdischarged, and the idle speed is not changed. That is, the idling speed is increased only when necessary, so that fuel efficiency is improved.

Next, a first embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, A is the fluctuating electric load R of the automobile.
1 is a vehicle power supply system having an open-circuit voltage 12.8 V battery B, an alternator 1 for charging the battery, and a regulator 2. The idling speed control device 3 connected to the vehicle power supply system A includes a duty detecting means 31, a detecting means 32 for detecting a low power generation capacity state of the alternator 1, an integrating means 33, and an actuator controlling means 34. And a microcomputer.

The alternator 1 has an armature coil 11, a field coil 12, a rectifying diode group 13, a brush, a step ring, and the like, and is connected to a crankshaft of the vehicle-mounted engine E by a belt.

Regulator 2 has a transistor Tr for switching the field current If, the zener diode Di for setting the target voltage V _M (14.5 V), comparing with the target voltage V _M the battery voltage V _B, the battery voltage V _B Is switched by the transistor Tr so that the target voltage V _M becomes the target voltage V _M, and the power generation amount of the alternator 1 is controlled.

The duty detecting means 31 detects the conduction state (duty) of the field current If by detecting the conduction state of the transistor Tr.

The detecting means 32 detects an idle state in which the engine E is rotating and the vehicle is stopped. The alternator 1
May be configured to detect a state in which the rotation of the motor is less than a predetermined value (for example, 1600 RPM).

The integrating means 33 integrates the idle time every 10 minutes.

When the integrated value is 5 minutes or more after 10 minutes, the actuator control means 34 determines that the conductivity of the field current If is 70%.
The actuator 100 is controlled to fall within the range of% to 90%. Note that the actuator 100 is a known air-fuel ratio control device that adjusts the supply amount of the air-fuel mixture supplied to the engine E.

Next, the operation of the idle speed control device 3 will be described with reference to the flowchart shown in FIG.

(1) In step S1, T (measurement time) = 0, IC
(Integrated value of time during idle state) = 0 and idle flag = 0.

(2) Idle is determined in step S2. If yes, the process proceeds to step S3.

(3) In step S3, the idle control flag = 1 is determined,
If yes, go to step S4; if no, go to step S2
Return to

(4) Duty is read in step S4, and step S5
Proceed to.

(5) It is determined in step S5 that the duty is greater than 90%. If no, the process proceeds to step S6. If yes, the idle-up is performed, and then the process returns to step S2.

(6) It is determined in step S6 that the duty is less than 70%, and if no, the process returns to step 2 without changing the idle speed.
If yes, perform idle down and return to step S2.

In all the states of steps S1 to S6, an interrupt consisting of steps S10 to S18 is performed every 10 ms.

1. Time measurement is performed in step S10, and T = T + 1 is executed every time 10 ms has elapsed.

2. In step S11, idle is determined. If yes, the process proceeds to step S12. If no, the process jumps to step S13.

3. In step S12, the time during the idle state is accumulated, and every time the idle state continues for 10 ms, IC = IC + 1 is executed.

4. In step S13, T ≧ 60000 is determined. If yes, the process proceeds to step S14, and if no, the process returns to the main (the location where the interrupt of steps S1 to S6 occurs).

5. In step S14, IC ≧ 30000 is determined. If yes, the process proceeds to step S15, and if no, the process proceeds to step S16.

6. In step S15, the idle control flag = 1 is executed, and the process proceeds to step S17.

7. In step S16, the idle control flag = 0 is executed, and the process proceeds to step S17.

8. In step S17, execute T = 0 and IC = 0, and return to main.

 Next, the operation and effect of this embodiment will be described.

(A) If the accumulated value is 5 minutes or more after 10 minutes, the idle speed control device 3 sets the actuator 100 so that the conductivity of the field current If falls within the range of 70% to 90%.
Control.

For this reason, the power generation capacity of the alternator 1 during idling is increased (when the conductivity is greater than 90%), and the discharged state of the battery B is eliminated. When the discharged state of the battery B is good (when the conductivity is less than 70%). In this case, the idling speed is reduced, which contributes to improved fuel efficiency.

(A) If the integrated value is less than 5 minutes after 10 minutes have elapsed, the battery B can be sufficiently charged when the alternator 1 is in the high power generation capacity state, so that the idle control is not performed.

(C) In the case of the configuration in which the low power generation capacity state of the alternator 1 is detected based on the number of revolutions of the alternator 1, the above-described effect is exerted even when the vehicle is running during traffic congestion other than during idling.

Next, a second embodiment of the present invention will be described with reference to FIG.

In this embodiment, when the integrated value is integrated for 5 minutes or more within 10 minutes without using the duty detecting means 31, the idle speed is simply increased.

 The operation and effect of this embodiment will be described below.

Since the idle speed is not increased during normal running (less than 5 minutes), the fuel efficiency is improved accordingly.

Since the duty detecting means 31 is not used, the configuration is simplified and the cost can be reduced.

 The present invention includes the following embodiments in addition to the above embodiments.

a. In the above embodiment, the predetermined time, set value, target voltage, and appropriate range are 10 minutes, 5 minutes, 14.5 V, and 70% to 90%, respectively, but may be appropriately determined.

b. The control of the actuator may be step-type instead of continuous.

c. The detecting means 32 may be configured to detect the low power generation capacity state of the alternator 1 by detecting the engine speed.

[Brief description of the drawings]

FIG. 1 is a block diagram of an idle speed control device according to a first embodiment of the present invention, and FIG. 2 is a flowchart for explaining the operation of the device. FIG. 3 is a configuration diagram of an idle speed control device according to a second embodiment of the present invention. In the figure, 1 ... alternator, 2 ... regulator, 3 ...
... Idle speed control device, 31 ... Duty detection means, 32 ... Detection means, 33 ... Accumulation means, 34 ... Actuator control means, 100 ... Actuator, A ... Vehicle power supply system, V _B ... Battery voltage, V _M …… Target voltage, If …… Field current, B …… Battery, R …… Electrical load

Continuation of the front page (56) References JP-A-61-104130 (JP, A) JP-A-58-43146 (JP, A) JP-A-63-25352 (JP, A) JP-A-62-171500 (JP) , A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F02D 29/06 F02D 45/00

Claims (2)

(57) [Claims] An alternator that is driven by an on-vehicle engine to generate power and charges a battery that supplies power to an electric load is in a low power generation capacity state, that is, when the vehicle is in an idle state, or when the rotation speed of the alternator is reduced. Detecting means for detecting a case of being equal to or less than a predetermined value, integrating means for integrating the time in the low power generation capacity state at predetermined time intervals, and actuator control means for controlling an actuator for adjusting an idle speed. An idle speed control device that outputs to the actuator the actuator control means to increase the idle speed when the integrated value is equal to or greater than a set value. 2. A battery for supplying electric power to an electric load of a vehicle, an alternator driven by an onboard engine to generate electric power and charge the battery, and comparing the battery voltage with a target voltage. An idle speed control device used in connection with a vehicle power supply system having a regulator for switching a field current of the alternator so as to control a power generation amount of the alternator so that a duty ratio of the field current is reduced. And a detection means for detecting when the alternator is in a low power generation capacity state, that is, when the vehicle is in an idle state, or when the rotation speed of the alternator is equal to or less than a predetermined value. An accumulating means for accumulating a certain time at predetermined time intervals, and an actuator for adjusting an idle speed. Actuator control means for controlling the actuator, wherein when the integrated value is equal to or greater than a set value, the actuator control means controls the actuator so that the conductivity of the field current falls within an appropriate range. Idle speed control device.