JP2863399B2 - Vehicle electronic control unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic control unit for a vehicle, and more particularly, to an electronic control unit for a vehicle which can restore a battery voltage to a target voltage even when a generator reaches a limit of its power generation capacity. is there.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a conventional electronic control unit for a vehicle. In the figure, reference numeral 1 denotes, for example,
A generator control device 2 having a power generation control means (not shown) as disclosed in Japanese Patent No. 266837 is a battery mounted on a vehicle (not shown), and has a voltage at its positive terminal (hereinafter referred to as Vb). .) Is input to the generator control device 1 via the wiring 201. 3 is battery 2
The generator is connected in parallel with the generator controller 1 and also connected to the generator controller 1, and its field current (hereinafter, referred to as If) is supplied from the generator controller 1 via the wiring 301. . Reference numeral 4 denotes an internal combustion engine that drives the generator 3;
Reference numerals 503 denote a plurality of, for example, three in-vehicle device control devices, each of which connects the internal combustion engine 4 as a vehicle-mounted device, a suspension (not shown), and a transmission (not shown) via wirings 401, 402, and 403, respectively. And the ON / OFF of the switches 601, 602, 603 is controlled via the wirings 404, 405, 406. 701
～703 internal combustion engine 4 and an electric load for example above, the suspension, the actuator of the transmission (hereinafter, referred to as E _L.) A, the power corresponding switch is connected to the turned ON battery 2 and the generator 3 is It works by being supplied.

A conventional vehicle electronic control device is configured as described above, and its operation will be described with reference to a time chart of FIG. The power generation capacity of the generator 1 is If and the internal combustion engine 4
(Hereinafter referred to as Ne), the operation in a state where Ne is constant will be described first. Time t1 In previous steady state, the generator control foregoing power generation control means in the apparatus 1 is Vb and the generator based on the target voltage V ₀ 3
Is electronically controlled. In this state,
One of the in-vehicle device control devices 501 to 503, for example, 5
When 01 E _L 701 corresponding by the ON the corresponding switch 601 is turned on at time t1, Vb drops instantaneously because the current consumed by the E _L 701 increases rapidly. Power generation control means detects a reduction in Vb, increase the If order to the Vb to a predetermined target voltage V _0.
When If increases, the generated current (not shown) of the generator 3 increases, and Vb recovers at time t2. In addition, another E _L
For example, when 702 is input at time t3, the operations of lowering Vb, increasing If, and recovering Vb at time t4 are repeated as in the case described above.

[0004]

In THE INVENTION Problems to be Solved by the conventional electronic control device for a vehicle, the load current drawn from the power supply when any E _L is operated at the same time by mutually independent vehicle apparatus control device increases. Determined depending on a power generation capacity of the generator as described above If and Ne, Ne exceeds the load current generating capacity number increases of E _L operating state is constant, If is controlled so that the maximum However, there is a problem that Vb is lowered and the recovery is not performed (see time t5 and thereafter in FIG. 6), which causes the battery to run down and the lamps and lights to become dark.

Accordingly, the present invention has been made to solve such a problem, and an electronic control unit for a vehicle which can recover Vb even when the generator reaches the limit of its power generation capacity. The purpose is to get.

[0006]

According to a first aspect of the present invention, there is provided a generator control device in a vehicle electronic control device, wherein the power generation is performed based on a battery voltage drop time and a field current supplied to the generator. Power generation limit detecting means for detecting that the machine has reached its power generation capacity limit, and information transmitting means for transmitting power generation limit information from the power generation limit detection means to a plurality of in-vehicle device control devices.

According to a second aspect of the present invention, one of the plurality of on-vehicle device control devices in the vehicle electronic control device detects the rotational speed of the internal combustion engine and transmits power generation limit information. A rotation speed control means for increasing the rotation speed at times.

[0008]

According to the first aspect of the present invention, a plurality of on-vehicle device control devices forcibly cut off an electric load having a low functional priority according to the transmitted power generation limit information.

According to the second aspect of the present invention, when the power generation limit information is transmitted, the rotation speed of the internal combustion engine is increased, and the power generation limit is increased by increasing the power generation capacity of the generator.

[0010]

[Embodiment 1] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of a vehicle electronic control device according to the present invention. In the figure,
The generator control device 1A includes, in addition to the above-described power generation control means, a power generation limit detection means 101 for detecting that the generator 3 has reached its power generation capacity limit, and power generation limit information from the power generation limit detection means 101. And information transmission means 102 for transmitting control information, power generation limit release information, and the like to a plurality of in-vehicle device control devices to be described later. The in-vehicle device control device 501A has a rotation speed control unit 50. Vehicle device controller 501A~503A may be unlike conventional vehicle device control apparatus 501 to 503 is sequentially forced cutoff from low E _L of the priority vehicle functions. The information transmission line 8 includes a generator control device 1A and an in-vehicle device control device 501.
A to 503A are connected to each other. In addition, 2-4,
Reference numerals 601 to 603 and 701 to 703 are the same as those described with reference to FIG.

The electronic control unit for a vehicle according to the present invention is configured as described above, and its operation will be described with reference to a time chart of FIG. As in the conventional example of FIG. 5, and Vb is momentarily reduced due to the current consumption at time t1, t3 for each of E _L is turned rapidly increases, the power generation by the order generation control means increases the If The current increases, so that Vb recovers at times t2 and t4. However, at time t5
When a new E _L is supplied at the same time, there occurs a phenomenon that the load current exceeds the power generation capacity and the Vb is not restored while Vb is reduced because many E _L are operated at the same time. Therefore, the power generation limit detecting means 101 in the generator control device 1A according to the present invention outputs a new E when the maximum If is being output.
From the time t5 which supplied the _L at the time t6 that the generator 3 reaches the limit of its power generation capacity since despite being a predetermined time T has elapsed Vb does not recover to the target voltage V ₀ with degraded And sends the power generation limit information to the information transmission means 102. Then, the information transmission means 102 transmits all the in-vehicle device control devices 501A through the information transmission path 8.
The power generation limit information is transmitted to ５０503A. Since the generator-vehicle device control apparatus 501A~503A the limit information received has priority as described above, for example, when the corresponding E _L 703 by vehicle device control apparatus 503A is that the corresponding switch 603 to OFF At t6, the battery 2 and the generator 3 are forcibly shut off. Thus E
_L forcibly interrupted from time to time by restoring Vb by decreasing until the current consumption of the same as the power generation capacity of the generator 3 to the target voltage V _0. Thereafter, when the power generation limit is released, the power generation limit detection unit 101 sends the power generation limit release information to the information transmission unit 102, and the information transmission unit 102 transmits the power generation limit release information to the on-vehicle device controllers 501A to 503A. In this way, the electronic control unit for the vehicle of the present invention returns to the normal control.
Normal control information is exchanged between 01A to 503A.

Next, since the power generation control means, the power generation limit detection means 101 and the information transmission means 102 in the generator control device 1A are implemented by a microcomputer (not shown), the operation of this microcomputer will be described with reference to the flowchart of FIG. I do. First, at step S1, the power generation limit detecting means 101
detecting a b, the Vb at step S2 is the determination of whether higher than the target voltage V _0. If Vb is lower than V ₀ , it is determined in step S3 whether If is the maximum. If not, the power generation control means resets If in step S4 as in the case of time points t1 and t3. If, at the maximum, If is held as at time t5 (step S5).

Next, the process proceeds to step S6, and if it is determined that the predetermined time T has elapsed while Vb is decreasing, the process proceeds to step S7.
The information transmission means 102 transmits a signal as power generation limit information to the in-vehicle device controllers 501A to 503A. The information processing microcomputer far, then vehicle device controller 501A~503A is forcibly shut off the low priority E _L based on the power limit information came transmitted.

When the predetermined time T has not elapsed in step S6 and after step S7, the process returns to step S1. Also, is higher than the V ₀ towards Vb at step S2, the information transmission means 102 proceeds to step S8 to stop the transmission of the power generation limit information, that is, the power limit release information to the vehicle-mounted apparatus controller 501A~503A Transmit. Then, the power generation control means reduces If in step S9, and thereby recovers Vb.

Embodiment 2 FIG. Although it restored the Vb by forcing shutoff in order of low priority among E _L that in Example 1 currently operating, at the time of idling of the vehicle, vehicle device controller speed control means 50 in the 501A is rotational speed of the internal combustion engine 4, thus has detected the idling of the vehicle, the rotational speed when the power limit information described above came transmitted 4
Vb is restored to the target voltage at time t7 by increasing the power generation capacity of the generator 3 from time t6. The information processing itself of the microcomputer in the second embodiment Ru der identical to FIG.

[0016]

As described above in detail, the generator control device in the electronic control unit for a vehicle according to the first aspect of the present invention is capable of reducing the battery voltage drop time and the field current supplied to the generator. Power generation limit detection means for detecting that the power generator has reached the limit of its power generation capacity, and information transmission means for transmitting power generation limit information from the power generation limit detection means to a plurality of in-vehicle device control devices. And the plurality of in-vehicle device control devices forcibly cut off the functionally low-priority electric load according to the transmitted power generation limit information, so that even when the generator reaches its power generation capacity limit, the Vb to the target voltage can be restored, this by battery
This has the effect of preventing rise of the lamp and preventing darkening of the illumination lamp or light.

According to a second aspect of the present invention, there is provided a generator control device in a vehicle electronic control device, wherein the generator has a power generation capacity based on a battery voltage drop time and a field current supplied to the generator. Power generation limit detection means for detecting that the limit has been reached, and information transmission means for transmitting power generation limit information from the power generation limit detection means to a plurality of in-vehicle device control devices, and the plurality of in-vehicle devices One of the control devices
Since the device has a rotation speed control means for detecting the rotation speed of the internal combustion engine and increasing the rotation speed when the power generation limit information is transmitted, the same effect as that described above is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a time chart for explaining the operation of the first embodiment of the present invention.

FIG. 3 is a flowchart of a microcomputer implemented in the present invention.

FIG. 4 is a time chart for explaining the operation of the second embodiment of the present invention.

FIG. 5 is a block diagram showing a conventional vehicle electronic control device.

FIG. 6 is a time chart for explaining the operation of the conventional vehicle electronic control device.

[Explanation of symbols]

Reference Signs List 1A generator control device 101 power generation limit detection means 102 information transmission means 2 battery 3 generator 4 internal combustion engine 501A to 503A in-vehicle device control devices 701 to 703 E _L

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02J 7/14-7/24 H02P 9/00-9/48 B60R 16/00-17/02

Claims (2)

(57) [Claims] A generator control device having power generation control means for electronically controlling a power generation amount of the generator based on a voltage of a battery charged from a generator driven by an internal combustion engine and a target voltage thereof; An electronic control unit for a vehicle including an in-vehicle device including the internal combustion engine and a plurality of in-vehicle device control devices for electronically controlling an electric load, wherein the generator control device includes a battery voltage drop time; Power generation limit detection means for detecting that the generator has reached the limit of its power generation capacity based on the field current supplied to the generator, and power generation limit information from the power generation limit detection means Information transmitting means for transmitting the information to the in-vehicle device control device, wherein the plurality of in-vehicle device control devices increase the electric load having a low priority in terms of the vehicle function based on the transmitted power generation limit information. Is interrupted, the vehicle electronic control unit, characterized in that. 2. A generator control device having power generation control means for electronically controlling a power generation amount of the generator based on a voltage of a battery charged from a generator driven by an internal combustion engine and a target voltage thereof; An electronic control unit for a vehicle including an in-vehicle device including the internal combustion engine and a plurality of in-vehicle device control devices for electronically controlling an electric load, wherein the generator control device includes a battery voltage drop time; Power generation limit detection means for detecting that the generator has reached the limit of its power generation capacity based on the field current supplied to the generator, and power generation limit information from the power generation limit detection means Information transmitting means for transmitting the information to the in-vehicle device control device, wherein one of the plurality of in-vehicle device controls detects a rotation speed of the internal combustion engine, and the power generation limit information is transmitted. Having a rotational speed control means for increasing the rotational speed when came, vehicle electronic control unit, characterized in that.