JP3245892B2 - Control device for automatic transmission for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a vehicle automatic transmission applied to a vehicle such as an automobile having an automatic transmission.

[0002]

2. Description of the Related Art A vehicle equipped with an automatic transmission is easy to start and shift during running, and has the advantage of not causing fatigue to the driver. However, the vehicle sometimes starts unintentionally. is there. Therefore, the invention made for the purpose of preventing this is disclosed in JP-A-62-29434 and JP-B-63-358.
There is one described in JP-A-64. The former is designed so that the transmission does not go to the lowest gear when the engine speed is equal to or higher than the set value and the vehicle speed is equal to or lower than the set value. When starting, the shift stage starts from the stage immediately below the highest stage.

[0003]

The techniques described in the above two publications can prevent the driver from starting unintentionally. However, the former control is performed only at the time of starting and the subsequent accelerator opening degree is controlled. The corresponding controls have not been clarified. On the other hand, in the latter case, regardless of the cooling water temperature of the engine, the vehicle is started from the next lower stage at the start, regardless of the engine cooling water temperature. is there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is intended to prevent unintentional starting and acceleration of a driver when the temperature of engine cooling water is low. An object of the present invention is to provide a control device that makes the transition from the warm-up mode to the normal control smoother even after the warm-up is completed.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a water temperature sensor for detecting a temperature of engine cooling water, and a rotation temperature sensor for detecting a rotation speed of the engine. A fuel injection controller that controls the fuel injection amount and an automatic transmission controller that selects the gear position of the automatic transmission are provided based on output signals from the number sensor, the water temperature sensor, and the rotation speed sensor. When the cooling water temperature is smaller than a preset value, the start control that starts with the highest gear of the vehicle is performed, and after the start control, the control is performed when the accelerator opening becomes larger than a preset value. A first control including a shift control for shifting between a high gear and a gear one lower than the highest gear is performed, and after performing the first control, the water temperature sensor detects When the cooling water temperature exceeds a preset value, the start control starts with a gear lower than the highest gear, and after the start control, the accelerator opening becomes larger than the preset value. A second control including a shift control for shifting between a highest gear and a gear two lower than the highest gear is performed.

With this configuration, when the cooling water temperature is lower than the set value, the vehicle starts with the highest gear,
The shift control is performed between the highest gear and the gear one lower than the highest gear when the accelerator opening becomes larger than the set value after the start, and when the coolant temperature exceeds the set value, Start with one lower gear than higher gear,
After the start, the accelerator opening becomes larger than the set value,
Shift control is performed between the highest gear and a gear two lower than the highest gear.

[0007]

FIG. 1 shows an embodiment of the present invention. Reference numeral 1 denotes a fuel injection controller, which is a water temperature sensor 2 for detecting the temperature of engine cooling water connected to the input side.
An injector 4 connected to the output side is controlled by an output signal from a rotation speed sensor 3 for detecting a rotation speed of the engine, and a fuel injection amount to a cylinder is controlled.

Reference numeral 5 denotes a controller for an automatic transmission for selecting the number of gears, a brake switch 6 on the input side, a vehicle speed sensor 7, an accelerator opening sensor 8, a P sensor 9 for detecting that the number of gears is parking, and a neutral. An N sensor 10 for detecting that the power supply is off and a warm-up mode release switch 11 are connected, and an alarm 12 and a shift solenoid 13 are connected to the output side. Alarm 1
Reference numeral 2 denotes a gear that sounds when an abnormality occurs.
Numeral 3 is for switching the number of gears. The automatic transmission controller 5 drives the shift solenoid 13 in response to signals input from the brake switch 6, the vehicle speed sensor 7, the accelerator opening sensor 8, and the like connected to the input side, and switches the number of gears.

FIG. 2 shows the relationship between the temperature of the engine cooling water and the engine speed. As shown in this figure, the engine speed gradually decreases until the temperature of the cooling water reaches a certain value, from which the engine speed is maintained at a constant speed.

The operation of the control apparatus for an automatic transmission for a vehicle according to the above configuration will be described with reference to FIGS. In FIG. 3, the engine is started in step 20. At this time, the shift lever of the transmission is in the P range, the brake is depressed, and the brake switch is on. The set temperature (constant) is T ₁ and the temperature of the engine cooling water is THW
When THW <T ₁ (step 21), the process proceeds to the next vehicle speed detection step (step 22).

If it is confirmed in step 22 that the vehicle speed is zero, that is, the vehicle is stopped, it is confirmed whether the transmission is in either the P range or the N range of the transmission lever gear (step 23). The warm-up mode 1 shown in FIG. 4 is turned on (step 24). As a result, when the relationship between the set temperature (constant) T ₁ and the temperature THW of the engine coolant becomes THW ≧ T ₁ (step 25), the warm-up mode 1 is turned off in the next step 26, and the warm-up mode 2
Turns on. Time T after warm-up mode 2 is turned on
When (seconds) have elapsed (step 27), the routine shifts to the normal control (step 28).

FIG. 4 shows a warm-up mode 1 and FIG. 5 shows a warm-up mode 2. 4, when both the brake switch and the idle switch are turned off from on (step 31), start control is performed at n speeds (n is a natural number of 3 or more and the maximum number of gears of the vehicle). Is performed (step 32), and then
Only when the accelerator opening becomes larger than the constant A (step 33), the shift control is performed between the (n-1) th speed and the nth speed.

In the flowchart of FIG. 3, when the warm-up mode 2 is executed in steps 25 to 27, the flowchart of FIG. 5 is executed. This is to prevent the driver from feeling uncomfortable when the control immediately shifts from the warm-up mode 1 to the normal control. In the warm-up mode 2, after the start of step 40,
At step 41, it is determined whether or not the vehicle is in the stop state.
If it is in the stop state, it is confirmed in the next step 42 that both the brake switch and the idle switch have been switched from on to off, and if not in the stop state, the warm-up mode 1 in step 43 remains.

At step 42, a brake switch,
When it is confirmed that both of the idle switches have been switched from on to off, the process proceeds to the next step 44 to control the n-1 speed. Only when the accelerator opening becomes larger than the constant A (step 45), the n speed is not changed. The shift control between the first and n-2nd speeds is performed (step 46). And set temperature (constant)
T ₁ and relationship between the temperature THW of the engine coolant THW ≧ T ₁
When the time T (seconds) elapses after this time, the control shifts to the normal control.

[0015]

According to the first aspect of the present invention, when the cooling water temperature is smaller than the set value, that is,
When the engine speed is set high during cold weather, the engine starts with the highest gear, and the accelerator opening becomes larger than the set value after the start, so that the highest gear and the gear one lower than the highest gear When the cooling water temperature is higher than the set value, that is, when the engine speed is set low after the completion of warm-up, the vehicle starts with a gear lower than the highest gear, and When the accelerator opening becomes larger than the set value, the gear is controlled to shift between the highest gear and two gears lower than the highest gear. The transition from the start to the completion of warm-up is also performed smoothly. As a result, it is possible to prevent an unfamiliar driver such as a beginner from giving a sense of incongruity, and to prevent the driver from starting unintentionally.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit according to an embodiment of the present invention.

FIG. 2 is a graph showing a relationship between an engine cooling water temperature and an engine speed.

FIG. 3 is a flowchart illustrating the operation of the circuit according to one embodiment of the present invention.

FIG. 4 is a flowchart illustrating control in warm-up mode 1;

FIG. 5 is a flowchart illustrating control in a warm-up mode 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fuel injection controller 2 Water temperature sensor 3 Speed sensor 4 Injector 5 Controller for automatic transmission 6 Brake switch 7 Vehicle speed sensor 8 Accelerator opening sensor 11 Warm-up mode release switch 13 Solenoid for speed change

Continuation of front page (56) References JP-A-62-258249 (JP, A) JP-A-61-228148 (JP, A) JP-A-62-29434 (JP, A) JP-A-62-261174 (JP, A) JP-A-63-121534 (JP, A) JP-A-2-27871 (JP, A) JP-A-1-98358 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB Name) F16H 59/00-61/12 F16H 61/16-61/24 F16H 63/40-63/48

Claims (1)

(57) [Claims] 1. A water temperature sensor for detecting a temperature of an engine cooling water; a rotation speed sensor for detecting a rotation speed of an engine; and a fuel for controlling a fuel injection amount based on output signals of the water temperature sensor and the rotation speed sensor. An injection controller and an automatic transmission controller for selecting a gear position of the automatic transmission are provided, and when the cooling water temperature detected by the water temperature sensor is smaller than a preset value, the highest gear of the vehicle is provided. Start control for starting, and after start control, a shift control for shifting between the highest gear and a gear one lower than the highest gear, which is performed when the accelerator opening becomes larger than a preset value. After the first control is performed, when the cooling water temperature detected by the water temperature sensor exceeds a preset value, the first control is performed. Starting control with a gear one lower than the highest gear; and starting from the highest gear and the highest gear after the starting control when the accelerator opening becomes larger than a preset value. A second control including a shift control for shifting between lower gears.