JPS6357846A - Fast idle controller in vehicle - Google Patents

Abstract

PURPOSE:To make such smooth control that is no hunting performable, by installing an idle control volume which determines the target load of a fast idle of a throttle valve and, when the said volume is zero, making it determine the target load according to a signal out of a water temperature sensor. CONSTITUTION:In case of an electronic controller 31 controlling drive of a step motor 29 and also controlling a throttle valve 29 for its opening or closing, it inputs each output signal out of an engine speed sensor 11, a water temperature sensor 32 and an idle control volume 33 determining a target load. And, according to output of the volume 33, it performs fast idle control and simultaneously when the output is zero, fast idle control by means of water temperature is performed. That is to say, within the initial setting time, the step motor 29 is driven toward the initial target load, and after the elapse of the initial setting time, a difference between a target engine speed to be set by water temperature at every setting period and the current engine speed is fed back to the target load, thereby making it perform the speed control.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fast idle control device for a vehicle.

(Prior Art) Conventionally, an automatic transmission has been proposed that takes advantage of the fuel efficiency of a manual gear transmission and automatically performs a gear shift operation together with the operation of a clutch mechanism.

In vehicles equipped with this type of automatic transmission, the engine's fuel control member is separated from the accelerator pedal, and in normal continuous rotation, the fuel supply is adjusted by operating the accelerator pedal in response to increases and decreases in load. Ru. However, during the gear shifting period, in order to smoothly disconnect and connect the clutch and clutch mechanisms, an electronic control device operates the fuel control member via an actuator such as a step motor, regardless of the operation of the accelerator pedal. It has become.

(Problem to be Solved by the Invention) However, in such an engine in which the fuel 1 control member is separated from the accelerator pedal, the idle rotation is determined by the setting signal of the electronic control device. In the case of a vehicle equipped with external loads such as an air conditioner or a power steering device, it becomes difficult to maintain idle rotation in response to these external loads.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a fast idle control device for a vehicle that performs smooth fast idle control without hunting using an idle control volume or taking water temperature into consideration.

(Means for solving the problem) In order to achieve the above-mentioned object, according to the present invention, “FL
Fast idle control in a vehicle characterized by comprising a throttle actuator to be sub-controlled, an idle control volume for determining a target load, and means for determining the target load based on a signal from a water temperature sensor when the volume is O. Equipment will be provided.

(Function) The engine rotation signal, current gear, clutch stroke, idle control volume, and water temperature are read. The conditions for fast idle control (the engine speed is at IIn between the engine speed upper limit and the engine speed lower limit, and the clutch is not engaged above a set value) are determined. Based on the output of the idle control volume, it is determined whether the fast idle control is performed using the idle control volume or the water temperature. During control using the idle control volume, the throttle actuator is controlled toward the target load determined by the idle control volume.

In the case of control based on ice temperature, control is performed toward the initial target load within a set period, and thereafter, control is performed toward the target load based on the difference between the target engine speed and the current engine speed. Note that when the idle control conditions are not satisfied, normal mechanical idle control is performed.

(Example) Next, one embodiment of the present invention will be described with reference to one drawing.

Fig. 1 is a schematic configuration diagram of the fast idle control device of the present invention, Fig. 2 is a graph showing the relationship between water temperature and target rotation speed, and Fig. 3 is a graph showing the relationship between the angle of the idle control volume and the target load. The graph shown in FIG. 4 is a flowchart of the control of the present invention.

In FIG. 1, 11 is an engine, 11a is an engine rotation speed sensor, 12 is a flywheel, 13 is a clutch,
14 is a hydraulic clutch actuator, 14a is a clutch stroke sensor, 15 is a piston rod, 16
A clutch mechanism is formed by release levers 113-16. 18 is a hydraulic mechanism, 19 is an input shaft, 20 is a transmission, 21a is an actuator of the transmission, 21b is a sensor that detects the gear position, 22 is an output shaft, 23 is a vehicle speed sensor, 24 is a select lever for driver operation, 25 is a select sensor that detects the position of the select lever, 26 is an accelerator pedal, 27 is an accelerator pedal sensor that detects the amount of depression of the accelerator pedal, 28 is a carburetor, and 29 is a throttle valve (
30 is a throttle actuator that drives the throttle 29 with a step motor, 31
is an electronic control unit, and has a microcomputer configuration.

1! p, the electronic control unit 31 has a read-only memory 3.
1a, a readable/writable data memory 31b for storing calculation results, input data, etc., an input/output interface 31c, and a processor 31d. memory 31
a includes (a) a control program for automatic gear shift control;
(b) In addition to storing automatic gear shift patterns, etc.
c) For each gear position, the correspondence between the slow 2-torque position and the engine rotational speed during gear shifting is stored.

Further, 32 is a water temperature sensor that senses the water temperature of the engine, and 33 is an idle control volume that determines the target load.

As is clear from FIG. 2, which shows a graph for determining the target rotation speed with respect to the water temperature of the engine 11, the lower the water temperature, the higher the target rotation speed.

FIG. 3 shows a graph for determining the target load against the angle of the idle control volume 33.

Next, an overview of control in the fast idle control device of the present invention will be explained.

The target load for fast idle is determined by the output of the engine coolant temperature sensor 32 or the idle control volume 3.
It is determined by the setting angle of No. 3, and if the following conditions are satisfied, the fast idle is canceled and becomes uncontrolled (mechanical idle).

That is, (1) The engine speed is less than or equal to the set value (limited to the engine speed -).

(2) Engine speed is set value (lower limit of engine speed)
It is as follows.

(3) The clutch is engaged at or above the set value. Note that the clutch is not released when the gear is in neutral.

In fast idle control based on water temperature, the initial [ ] mark roller and target engine speed are determined, and the throttle actuator is driven without feedback toward the initial target load within the initial setting time. After the elapse of time, as shown in Figure 2, the difference between the target engine speed set by the water temperature and the current engine speed is fed back to the target load at each set cycle, so that the actual engine speed is adjusted to the target speed. Control the numbers to match.

In fast idle control using the idle control volume, as shown in FIG. 3, a target load is determined according to a volume signal representing a volume angle, and the throttle actuator is controlled toward the target load.

In addition, in fast idle control, there is an internal value (FAST:PH) that indicates the control mode, and depending on the control state,
Take the values in the table below.

The value of FAST: PH is also referred to within the control table, and the distinction between the control modes is used.

Next, the present invention will be described in detail with reference to FIG.

Each input signal of engine speed, current gear, clutch stroke, idle control volume, and water temperature is read (step 5t-ss).

Then check the fast idle operating conditions.

That is, it is determined whether the following conditions (1) and (2) are satisfied, and if they are satisfied.

Fast idle control is performed, and if the condition is not satisfied, mechanical idle is performed such that the minimum load value is O.

(1) If the current gear is not N (neutral), set value 2 (lower limit rotation speed) ≦ actual engine speed ≦ set value 1 (upper limit rotation speed), and the latch stroke is cut off from set value 3. Being by your side.

(2) If the current gear is N (neutral), set value 2
≦Actual engine rotation speed≦Setting value 1 (however, setting value 1>setting value 2).

Actually, whether the engine speed is larger or smaller than the set value l (step S6), the engine speed is set (+I'
It is determined whether the clutch stroke is greater than the set value 3 or not (step S7), whether the current gear is neutral (N) or not (step S8), and whether the clutch stroke is on the off side than the set value 3 (step S9). , when the engine speed is greater than the set value 1, when it is less than the set value 2, or when the current gear is not N but is in the measurement range from the set value 3, the above conditions (1) and (2) are met. Since it does not satisfy
mechanical idle control).

In the case of no control, the internal value of control mode (FAST: P
O is substituted into H) (step 5lO), and O is read into the target load.

Next, when it is determined that there is no control, it is determined based on the idle control volume signal whether the fast idle control is based on the water temperature or the fast idle based on the idle control volume control (step 512).
), in this determination step, when the idle control volume signal indicates the angle O, it is determined that the fast idle control is based on the water temperature; otherwise, it is determined that the fast idle control is performed using the idle control volume.

In the case of fast idle control using the idle control volume, the RAM control mode internal value (FAS
Assign 08 to the T: PH) area (step 515)
), and a target load (see FIG. 3) preset in accordance with the idle control volume signal is read into the IDLE:RES\1 area of the RAM (step 516).

In addition, in the case of fast idle control based on water temperature, the target rotation speed (see Figure 2) set in advance according to the water temperature is R.
ENG of AM: Read into the TRM area (step S13), and 06 indicating that the mode has become the fast idle control mode based on water temperature is substituted into the B area of the RAM (step 514).

RAM FAST indicating fast idle control mode
: Refers to the PH area and determines whether the control that was being performed until the previous time was B. In other words, it is determined whether the control is based on water temperature, no control, or control based on the idle control volume (step 517).If water temperature control has not been performed until the previous cycle and this is the first time water temperature control is being performed, RAM FAST:P
Substitute H region B (=06) (step 518), R
AM IDLE: The initial target load preset according to the water temperature is read into the TRM area (step 519), and then O is substituted into the timer counter in order to obtain the feedback cycle (step 520). That is, the timer counter is reset. If it is not in the initial state, that is, if FAST:PH=B in step S17, the series of processes from steps 318 to S20 are not performed.

In order to obtain a feedback cycle, the timer counter is incremented by 1 at each set time (step 521).

The timer counter is used to check whether it is the cycle for feedback (steps S22, 523).If the initial target load has just been set according to the water temperature, the timer counter is O, so it is the set value 4. Feedback control is not performed until (step 52
2), Therefore, the initial feet bar is (
This will be carried out after a time period of (set value x control period).

This is because the intention was to provide feedback after obtaining an actual response based on the initial value. After the first feedback, the set value 5 is assigned to the timer counter every time feedback is performed (step 5).
23), subsequent feedback will be performed every ((set value 4 - set value 5) x control period) (however, set value 4>set value 5>0).

ENG of R'AM which is the actual engine speed and target speed
: Compare with the value read into TRM and calculate fee 1ζ
However, if it is determined that it is within the range of ENG: TRM-α≦actual engine speed≦ENG: TRM+α (Stave 24°525), no feedback is performed in order to prevent hunting due to feedback. In other words, the range of ±α is considered to be insensitive (i).

Actual engine speed <ENG: If TRM-α, target load IDLE: Increase TRM by set value β (step 326), actual engine speed>ENG:
In the case of TRM+α, target load IDLE:TRM is reduced by the set value β (step 527).

Next, proceed to the step of setting the target load by fast idle. In the case of control by the idle control volume, set IDLE: RES as the target load (step 528), and in the case of control by water temperature, set IDLE: TRM. Set as the target load (step 529).

Determine the target load that actually drives the load control actuator (throttle actuator). It is determined whether the target load is larger or smaller than the target load caused by the accelerator (step 530), and if it is larger, the first idle target load is set, and if it is smaller, the target load caused by the accelerator is set as the target load (step 531), that is, the larger one is set. is selected as the target load, which means that the 11 mark rotor with fast idle is the lowest value of the actuator driven 0 mark rotor.

The rotor control actuator is controlled so that the actual load becomes the determined target load (step 532).

Fast idle control is performed by executing the above operation at a set time period.

(Effects of the Invention) As described above in detail, the present invention is capable of selectively controlling the idle control volume based on the target load based on the water temperature, and in particular, in the control based on the water temperature, feedback is provided until a response based on the initial target load appears. Since the configuration is such that the process does not start, smooth control without hunting can be performed.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of the fast idle control system of the present invention, Fig. 2 is a graph showing the relationship between water temperature and target rotation speed, and Fig. 3 is a graph showing the relationship between the angle of the idle control volume and the target load. A graph showing the relationship, FIG. 4, is a flowchart of control according to the present invention. 11... Engine, lla... Engine speed sensor, 12... Flywheel, 13... Clutch,
14...Clutch actuator, 15...Piston rod, 16...Release lever, 19...Input shaft, 20...Transmission, 21a...Transmission actuator, 21b...Gear position sensor , 22
... Output shaft, 24... Select lever, 25... Select sensor, 26... Accelerator pedal, 27... Accelerator pedal sensor, 28... Carburetor, 29... Throttle valve, 30... ...Throttle actuator, 31...Electronic control unit, 3
2... Water temperature sensor, 33... Idle control volume. Patent applicant: IsuC Automobile Co., Ltd. (1 other person) Representative: Patent attorney Minoru Tsuji Figure 2 Figure 3

Claims (3)

[Claims] (1) An electronically controlled throttle actuator and an idle control volume that determines the target load;
A first idle control device for a vehicle, comprising means for determining a target load based on a signal from a water temperature sensor when the volume is zero. (2) The fast idle control in the vehicle according to claim (1) is characterized in that the fast idle control based on the signal from the water temperature sensor is performed by feedback control based on the target load after a predetermined period of time has elapsed. Idle control device. (3) The fast idle control based on the signal from the water temperature sensor is characterized in that the amount of feedback in one cycle is limited to a certain value or less.
A fast idle control device for a vehicle according to item 1) or item (2).