JPH08312765A - Control specification determination device - Google Patents

Abstract

(57) [Summary] [Purpose] By determining whether the vehicle is an A / T vehicle or M / T vehicle before starting the internal combustion engine, it is possible to perform control that meets the vehicle specifications immediately after starting the internal combustion engine. To do. [Structure] Neutral signal line 32 in A / T vehicles
Is connected to the digital input circuit 17 of the ECU 10 halfway between the starter switch 35 and the neutral switch 33, and the neutral signal line 32 is not connected in the M / T vehicle. Therefore, in the A / T vehicle, the starter 3 is operated when the neutral switch 33 is on.
Ground 0V via 6 (-terminal voltage of battery 41)
And the neutral switch 33 before starting the internal combustion engine.
Is open when is off. This makes E
The CU 10 can determine whether the vehicle is an A / T vehicle or an M / T vehicle by detecting the terminal voltage of the neutral signal line 32 even before the internal combustion engine is started. Suitable control is possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an automatic transmission (Automati).
Vehicles equipped with c Transmission (hereinafter referred to as "A / T vehicles")
And manual transmission (Manually Shifted Transmissi
On) is stored in the memory for both control programs of vehicles (hereinafter referred to as "M / T vehicles"), and the control program corresponding to the A / T vehicle or the M / T vehicle is alternatively selected. The present invention relates to a control specification determination device that can be selected.

[0002]

2. Description of the Related Art Conventionally, as a prior art document related to a control specification discriminating apparatus, one disclosed in Japanese Patent Laid-Open No. 4-224262 is known.

In this system, control programs for both the A / T vehicle and the M / T vehicle are stored in the memory, and it is determined whether the vehicle is an A / T vehicle or an M / T vehicle according to the vehicle type and specifications. A technique is disclosed in which an internal combustion engine (engine) control corresponding to A / T vehicle specifications or M / T vehicle specifications is performed by selectively selecting from both control programs and maintaining the selected state.

[0004]

In the above device, the ECU
CP of (Electronic Control Unit)
When a D (drive) range signal is input to U, A
When the / T vehicle and the D range signal are not input, it is determined to be the M / T vehicle. However, the start of the internal combustion engine in the A / T vehicle is possible in the P (parking) range or the N (neutral) range, and after the ignition switch is turned on, the A / T vehicle remains in the A / T range until it is shifted to the D range.
There is a problem that the T car cannot be discriminated and the A / T car cannot be controlled within this period.

Therefore, the present invention has been made in order to solve such a problem, and the A / T before starting the internal combustion engine is performed.
An object of the present invention is to provide a control specification determination device that can perform control that matches vehicle specifications immediately after the start of the internal combustion engine by completing the determination of whether the vehicle is an M / T vehicle.

[0006]

According to a first aspect of the present invention, there is provided a control specification discriminating apparatus, a common ECU for controlling an A / T vehicle or an M / T vehicle, and a shift position of the A / T vehicle for a neutral range and parking. Only the neutral detection means, which is on in the range and turned off in the other ranges and remains on regardless of the shift position in the M / T vehicle, and the ECU of the A / T vehicle are connected by wiring to detect the neutral state. A neutral signal line for inputting a neutral signal that changes depending on the state of the means, and the A / A based on the presence / absence of the neutral signal from the neutral signal line.
A specification discriminating means for discriminating whether the vehicle is a T car or the M / T car.

In the control specification discriminating apparatus according to a second aspect, the specification discriminating means in the first aspect initializes a control program so as to correspond to the M / T vehicle, and the neutral signal from the neutral signal line. When the is input, the setting of the control program is changed so as to correspond to the A / T vehicle.

According to a third aspect of the present invention, in addition to the means provided in the first or second aspect, the control specification discriminating apparatus stores a discrimination result by the specification discriminating means and a storage means. Holding means for holding the determination result until a predetermined state appears.

[0009]

In the control specification discrimination device according to the first aspect, A /
In the T car, a neutral signal that changes depending on the state of the neutral detection means that is on when the shift position is in the neutral range and the parking range and is off when the shift position is in other ranges is input to the ECU through the neutral signal line. Further, in the M / T vehicle, the neutral signal by the neutral detecting means remains ON regardless of the shift position, but since the neutral signal line is not wired and connected, the neutral signal is not input to the ECU. And
The specification determining means determines whether the vehicle is an A / T vehicle or an M / T vehicle based on the presence / absence of a neutral signal from the neutral signal line.

In the control specification discriminating apparatus according to claim 2, when the control discriminating means according to claim 1 initializes the control program so as to correspond to the M / T vehicle, and the neutral signal is input from the neutral signal line. The setting of the control program is changed to correspond to the A / T vehicle.

According to the control specification discriminating apparatus of claim 3, in addition to the operation of claim 1 or claim 2, the discriminating result by the specification discriminating means is stored in the storing means, and the storage state is stored in a predetermined state by the holding means. Is held until appears.

[0012]

EXAMPLES The present invention will be described below based on specific examples.

FIG. 1 is a block diagram showing the overall configuration of a control specification discriminating apparatus according to an embodiment of the present invention.

In FIG. 1, 10 is an ECU, and EC
U10 is commonly used by A / T vehicles and M / T vehicles and controls the respective internal combustion engines. The ECU 10 includes a microcomputer 11, an analog input circuit 16, a digital input circuit 17, an output circuit 18, an engine speed detection circuit (not shown), a power supply circuit, and the like.

The microcomputer 11 of the ECU 10 mainly has a CPU 12, a ROM 13 for storing control programs and control constants, a RAM 14 for temporarily storing various calculation data and input / output data, and stores and holds predetermined data, diagnostic codes and the like. It comprises a standby RAM 15 and the like. The analog input circuit 16 includes an O ₂ (oxygen) sensor 2
0, each of the analog signals from the water temperature sensor 21, the intake air amount sensor 22, etc. is read and each data is sent to the microcomputer 11. Also, the digital input circuit 17 is
A signal from the air conditioner switch 31, a neutral signal NSW from a neutral signal line 32, which is wired and connected only to an A / T vehicle, and a starter signal ST from a starter signal line 34.
Each digital signal such as S is read and each data is sent to the microcomputer 11. Then, the output circuit 18
Drives a fuel injection valve 50, an ignition device 51, and an idle speed control (Idle Speed Control; hereinafter simply referred to as “ISC”) device 52 by an output signal from the microcomputer 11.

Next, the neutral signal NSW and the starter signal STS will be described in detail with reference to FIG.

In an A / T vehicle, the ignition switch 4
When 0 is on and the starter switch 35 is on,
Even if the starter switch 35 is turned on, the starter 36 does not operate so that the vehicle does not start moving against the driver's intention unless the shift position is in the N (neutral) range or the P (parking) range. That is, the battery 41
An ignition switch 40 and a starter switch 35, which are connected in series with, are further connected in series with a neutral switch 33 that is turned on only when the shift position is in the N range or the P range.

On the other hand, in the M / T vehicle, when the neutral switch 33 is always in the short-circuited state, the ignition switch 40 is on and the starter switch 35 is on, the starter 36 is activated at any time.

In the A / T car, the neutral signal line 3
2 is a starter switch 35 and a neutral switch 33
The digital input circuit 17 of the ECU 10
Is grounded through the starter 36 when the neutral switch 33 is turned on.
(-Terminal voltage of the battery 41) and becomes open when the neutral switch 33 is off before the internal combustion engine is started. In addition, in A / T car or M / T car,
The starter signal line 34 is wired and connected to the digital input circuit 17 of the ECU 10 from the middle of the wiring between the neutral switch 33 and the starter 36, and the starter 36 is in an operating state, that is, the power supply voltage + BV (+ terminal voltage of the battery 41) is applied. When the starter 36 is in the non-operating state, the power source voltage is + BV, and the ground voltage is 0V (the terminal voltage of the battery 41) via the starter 36.

Next, the processing procedure of the CPU 12 in the microcomputer 11 of the ECU 10 used in the control specification discriminating apparatus according to the embodiment of the present invention will be described with reference to the flowcharts of FIGS.

First, in step S101 in the initialization routine of FIG. 2, the determination flag XAT indicating whether the vehicle is an A / T vehicle or an M / T vehicle is set to 0, that is, the vehicle is initialized as an M / T vehicle. Other initialization processing is executed,
This routine ends.

Next, at step S201 in the main routine of FIG. 3, the neutral switch 33 is turned on (O
N), that is, it is determined whether the neutral signal NSW is 0V and is connected to the ground. Step S2
When the determination condition of 01 is satisfied, step S202
Since the neutral signal line 32 is wired, it can be determined that the vehicle is an A / T vehicle, the determination flag XAT indicating that the vehicle is an A / T vehicle or an M / T vehicle is set to 1, and the vehicle is regarded as an A / T vehicle. Is set.

On the other hand, when the neutral switch 33 is not turned on in step S201, the shift position of the A / T vehicle is not in the N range or the P range, or M /
Since it is a T vehicle, step S202 is skipped and the determination flag XAT is 0, which is the initial setting, and is not changed. As described above, in the A / T vehicle, in order to operate the starter 36 at the time of starting the internal combustion engine, it is necessary to set the shift position to the N range or the P range and turn on the neutral switch 33. Step S2
By executing the processing of 02, it is possible to determine the A / T vehicle. Here, once the A / T vehicle determination process is executed, the setting of the M / T vehicle is not returned unless the initial setting is performed by turning on the power.

Then, in step S203, it is determined whether the discrimination flag XAT = 1. When the determination condition of step S203 is satisfied, the process proceeds to step S204, and the ISC target rotational speed of the internal combustion engine by the ISC device 52 is set to 700 rpm based on the determination that the vehicle is an A / T vehicle. On the other hand, when the determination condition of step S203 is not satisfied, the process proceeds to step S205, and the ISC target rotation speed of the internal combustion engine by the ISC device 52 is set to 650 rpm based on the determination of the M / T vehicle. Step S204
Alternatively, after the processing of step S205, step S206
If the ISC control condition is satisfied such that the throttle valve (not shown) is fully closed, the ISC control process is executed.

The ISC control detects the engine speed of the internal combustion engine in order to stabilize the idle speed when the internal combustion engine is idling, and increases it when the speed is lower than the target speed and decreases it when the speed is higher than the target speed. As described above, a gasoline engine controls the intake air amount and the like, and a diesel engine controls the fuel injection amount. Further, in the A / T vehicle, the target rotation speed is changed and controlled depending on whether the shift position is the N range, the P range, or another D range. Thus, A /
Changing the target rotation speed between the T car and the M / T car is
This is because the vehicle has a load on the torque converter and is difficult to stabilize unless the engine speed is set higher than that of the M / T vehicle even in the neutral state.

Next, in step S207, as other control processing, the basic fuel injection amount calculation by the intake air amount sensor 22 which is the basic control for the internal combustion engine, O
₂ A / F (air-fuel ratio) feedback control by the sensor 20, correction control of fuel injection amount and ignition timing by the water temperature sensor 21, and the like are executed, and this routine is ended.

Here, as a very rare case in this embodiment, as shown in FIG.
0 is turned off (OFF) → on (ON), that is, the ECU 10
If the starter switch 35 is turned off (OFF) and then turned on (ON) immediately after the power source is turned off (OFF) → turned on (ON), the neutral position will be obtained even if the shift position is N range or P range in an A / T vehicle. The neutral signal NSW of the signal line 32 is "H" of + BV (+ terminal voltage of the battery 41).
It becomes the i "level and cannot be detected as an A / T car.

Further, even in an A / T vehicle, immediately after the starter switch 35 is turned on (ON) → off (OFF), the neutral switch 33 is turned on (ON) → off (OF).
F), that is, if the shift position is set to a position other than the N range or the P range, the neutral signal NSW of the neutral signal line 32 becomes the "Hi" level, so it cannot be determined that the vehicle is an A / T vehicle.

Such a problem is caused by an A / T car or M /
Stand-by RAM 1 for determining flag XAT to determine whether the vehicle is a T car
By setting it in the storage area of 5, it is possible to avoid erroneously determining the A / T vehicle as the M / T vehicle even after the first determination as the A / T vehicle even in the above case. It

By the way, in the present embodiment, the neutral signal line 32 is not connected to the M / T vehicle, but noise or the like is input to an empty terminal on the side of the ECU 10 and it is erroneously determined to be at the "Lo" level. However, once it is erroneously stored, it cannot be discriminated as an M / T vehicle until the battery 41 is removed.

ECU 1 for coping with such a case
The processing procedure of the CPU 12 in the microcomputer 11 of No. 0 will be described based on the flowchart of FIG. In other words, the solution is to solve the problem by turning the ignition switch 40 off (OFF) → on (ON), that is, re-determining every predetermined number of times of initial setting of the control program.

First, in step S301, the standby R
It is determined whether the AM 15 is normal. Step S30
When the determination condition of 1 is not satisfied and the standby RAM 15 is abnormal, the process proceeds to step S302, and the initial setting is performed in step S305 described later.
INIT is set to 3. When the determination condition of step S301 is satisfied, step S302 is skipped, the process proceeds to step S303, and the counter CINIT is incremented by "1". Next, the process proceeds to step S304, and it is determined whether the counter CINIT exceeds 3. When the determination condition of step S304 is satisfied and the counter CINIT becomes 4, the process proceeds to step S305, the counter CINIT is set to 0, and the determination flag XAT indicating whether the vehicle is an A / T vehicle or an M / T vehicle is set to 0. ,
It is an M / T vehicle in the initial setting. On the other hand, step S
The determination condition of 304 is not satisfied, and the counter CINIT is 3
If so, step S305 is skipped, the determination flag XAT is used as it is in the storage state of the standby RAM 15, and this routine is ended.

As described above, the control specification discriminating apparatus of the present embodiment has the common ECU 1 for controlling the A / T vehicle or the M / T vehicle.
0, the A / T vehicle is turned on when the shift position is in the N (neutral) range and the P (parking) range, and is turned off in other ranges, and the M / T vehicle is turned on regardless of the shift position. A neutral detecting means composed of a neutral switch 33 for maintaining, and the A /
Neutral signal line 3 for inputting the neutral signal NSW from the neutral switch 33 to the ECU 10 of the T car
2 and specification determining means achieved by the CPU 12 in the microcomputer 11 of the ECU 10 that determines whether the vehicle is the A / T vehicle or the M / T vehicle based on the presence or absence of the neutral signal NSW from the neutral signal line 32. Which is the embodiment of claim 1.

Therefore, in the A / T vehicle, the shift position is N.
The neutral signal NSW that changes depending on the state of the neutral switch 33 that is ON in the range and P range and OFF in the other ranges is the neutral signal line 32.
Is input to the ECU 10 via. Further, in the M / T vehicle, the neutral switch 33 remains ON regardless of the shift position, but since the neutral signal line 32 is not connected to the ECU 10, the neutral signal NSW is sent to the ECU 10.
Is not entered. Then, in the specification determining means achieved by the CPU 12 in the microcomputer 11 of the ECU 10, the neutral signal N from the neutral signal line 32 is obtained.
It is determined whether the vehicle is an A / T vehicle or an M / T vehicle based on the presence / absence of SW.

Therefore, by determining whether the vehicle is an A / T vehicle or an M / T vehicle before the internal combustion engine is started, it is possible to execute control that meets the vehicle specifications immediately after the internal combustion engine is started, and to achieve stable engine rotation. You can get numbers and so on. Further, in the M / T vehicle, the wiring connection of the neutral signal line is unnecessary, and the cost reduction can be achieved.

The control specification discriminating apparatus of the present embodiment is E
When the specification determining means achieved by the CPU 12 in the microcomputer 11 of the CU 10 initializes the control program so as to correspond to the M / T vehicle, and the neutral signal NSW from the neutral signal line 32 is input. The setting of the control program is changed so as to correspond to the A / T vehicle, and this can be the embodiment of claim 2.

Therefore, the control program is initialized by the specification discriminating means achieved by the CPU 12 in the microcomputer 11 of the ECU 10, and the neutral signal NSW from the neutral signal line 32 is input. The control program settings are changed so as to correspond to the A / T vehicle. Therefore, only when the neutral signal NSW from the neutral signal line 32 is input, it is determined that the vehicle is an A / T vehicle.
The control program is simplified.

The control specification discriminating apparatus of this embodiment is
Further, the CP in the microcomputer 11 of the ECU 10
In the microcomputer 11 of the ECU 10, which stores the determination result achieved by the specification determination unit achieved in U12, the storage unit including the standby RAM 15, and the determination result stored in the storage unit until a predetermined state appears. It is provided with a holding means achieved by the CPU 12, and this can be the embodiment of claim 3.

Therefore, in the standby RAM 15 as a storage means, the microcomputer 11 of the ECU 10 is used.
The determination result achieved by the specification determining means achieved by the CPU 12 in the inside is stored, and the stored state is held by the holding means achieved by the CPU 12 in the microcomputer 11 of the ECU 10 until a predetermined state appears. . Therefore, once the determination result of the A / T vehicle or the M / T vehicle is stored, the determination result is retained until the predetermined state appears, and thus the erroneous determination can be prevented.

[0040]

As described above, according to the control specification discriminating apparatus of the first aspect, in the A / T vehicle, the neutral position detection is ON when the shift position is in the neutral range and the parking range and is OFF in the other ranges. The neutral signal that changes depending on the state of the means is input to the ECU via the neutral signal line, and in the M / T vehicle, the neutral signal by the neutral detecting means remains ON regardless of the shift position, but the neutral signal line is connected by wiring. Since the neutral signal is not input to the ECU, the specification determining means determines whether the vehicle is an A / T vehicle or an M / T vehicle based on the presence / absence of the neutral signal from the neutral signal line. As a result, the determination as to whether the vehicle is an A / T vehicle or an M / T vehicle is completed before the internal combustion engine is started, so control that is suitable for the vehicle type can be performed immediately after the internal combustion engine is started, and stable internal combustion engine control can be executed. can do.
Further, in the M / T vehicle, the wiring connection of the neutral signal line is unnecessary, and the cost can be reduced.

According to the control specification discriminating apparatus of the second aspect, in addition to the effect of the first aspect, the control discriminating means initializes the control program so as to correspond to the M / T vehicle, and the control signal is transmitted from the neutral signal line. When the neutral signal is input, the setting of the control program is changed to correspond to the A / T vehicle. In this way, the control program can be simplified because it is determined that the vehicle is an A / T vehicle only when the neutral signal from the neutral signal line is input.

According to the control specification discrimination device of claim 3, in addition to the effect of claim 1 or claim 2, the discrimination result by the specification discrimination means is stored in the storage means, and the storage state is predetermined by the holding means. It is held until the state of appears. In this manner, the determination result once the specification is determined is stored and held, so that an erroneous determination due to noise or the like can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a control specification determination device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure of initial setting of the CPU used in the control specification determination device according to the embodiment of the present invention.

FIG. 3 is a flowchart showing a main processing procedure of a CPU used in the control specification determination device according to the embodiment of the present invention.

FIG. 4 is a time chart showing each signal state in the control specification determination device according to the embodiment of the present invention.

FIG. 5 is a flowchart showing another processing procedure of initial setting of the CPU used in the control specification determination device according to the embodiment of the present invention.

[Explanation of symbols]

10 ECU (Electronic Control Unit) 11 Microcomputer 12 CPU 15 Standby RAM 32 Neutral Signal Line 33 Neutral Switch (Neutral Detection Means) 34 Starter Signal Line 35 Starter Switch 36 Starter 40 Ignition Switch 41 Battery NSW Neutral Signal

Claims (3)

[Claims] 1. A common electronic control unit for controlling a vehicle equipped with an automatic transmission or a vehicle equipped with a manual transmission, and a vehicle equipped with the automatic transmission is turned on when a shift position is in a neutral range and a parking range. In other ranges, it is turned off, and in a vehicle equipped with the manual transmission, neutral detection means for maintaining the on state regardless of the shift position, and wiring connection only to the electronic control unit of the vehicle equipped with the automatic transmission A neutral signal line for inputting a neutral signal that changes depending on the state of the neutral detection means, and a vehicle equipped with the automatic transmission or a manual transmission based on the presence or absence of the neutral signal from the neutral signal line. And a specification discriminating means for discriminating whether the vehicle is a vehicle. Control specification determination device. 2. The specification determining means initializes a control program so as to correspond to a vehicle equipped with the manual transmission, and the automatic transmission when the neutral signal from the neutral signal line is input. The control specification determination device according to claim 1, wherein the setting of the control program is changed so as to correspond to a vehicle in which the control specification determination device is installed. 3. A storage means for storing the determination result by the specification determining means, and a holding means for holding the determination result stored in the storage means until a predetermined state appears. The control specification determination device according to claim 1 or 2.