JPS59156826A - Controller for automatic speed change gear for car - Google Patents

Abstract

PURPOSE:To secure the safety in drivng by installing a means which detects the rise of temperature over a prescribed value and selects shift, thus applying engine brake. CONSTITUTION:A temperature sensor 2 for detecting the temperature of a brake shoe 1 is installed, and the temperature is measured by a temperature measuring means 3 which is operated by the detection signal of the temperature sensor 2. When the measured temperature exceeds a prescribed temperature level, a shift selecting means 4 is operated by said output signal, and shift is selected on the basis of the temperature and other condition, and the results of said selection are output as shift signal 5a by a shift-signal output means 5. Said shift signal 5a is input into an output delaying means 6 such as timer, and the output is feedback input into a junction point J so that the initial state is recovered after a certain time lapse.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for an automatic transmission for an automobile, and more specifically, to control a fade phenomenon caused by an increase in the temperature of brake shoes of an automobile.
Peno due to rise in brake oil temperature! - It relates to a control device for switching the operating mode of an automatic transmission in order to prevent a lock phenomenon.

In general, it is common sense to use engine braking when a car continuously travels down a slope and requires braking the vehicle speed for a long period of time. If you use the brakes a lot under these conditions, the brake shoes (
This is because the brake shoes (hereinafter referred to as brake shoes) generate heat due to frictional heat caused by braking, or the temperature of the brake oil increases and bubbles are generated, which significantly reduces the braking ability of the brakes, resulting in a dangerous situation. However, beginners and inexperienced drivers often use the brakes a lot on these slopes. However, with conventional automatic transmissions, when driving on a slope, etc., the manual select lever is moved to downshift, fixing 2nd or 1st gear, and changing gears to a lower gear than the one corresponding to the vehicle speed. It was necessary to consciously switch to the desired driving mode, which could be dangerous for inexperienced drivers.

This invention was made in order to eliminate the drawbacks of the conventional devices as described above, and includes a means for detecting this and selecting a shifter when the temperature of the brake shoes or the brake oil rises above a predetermined temperature. An object of the present invention is to provide a control device for an automatic transmission for an automobile, which can automatically downshift to reduce the vehicle speed and fully operate the engine brake, thereby ensuring driving safety.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

In the figure, a temperature sensor 2 is provided to detect the entire temperature of the brake shoe 1, and a temperature measuring means 3 activated by the detection signal of the temperature sensor 2 measures the temperature, and when the measured temperature exceeds a predetermined temperature level. In this case, the shift selection means 4 is actuated by the output signal to select a shifter based on the temperature and other predetermined conditions, and the selection result is outputted from the shift signal output means 5 as a shift signal 5a. The shift signal 5a is output by an output delay means 6 such as a timer.
The output is fed back to the connection point JK provided between the temperature sensor 2 and the temperature measuring means 3 so as to wait for a predetermined time to elapse and restore the initial state, The measuring means 3 is configured to detect the temperature of the brake shoe 1 again.

FIG. 2 is a circuit configuration diagram of the embodiment shown in FIG. 1, in which 7 is a control device, 8 is a microcomputer in the control device 7, CPU 9, memo! 710. Input circuit 11. It has a timer 12 and an output circuit 13. 14
is a resistor connected in series with the temperature sensor 2, 15.16
is a resistor, which is connected in series with a brake switch 17 that opens and closes when the sole brake is operated, and an accelerator switch 18 that opens and closes when the accelerator is operated. 19 is A/
The D converter is configured to convert the analog signal from the temperature sensor 2 into a digital signal, and input this to the input circuit 11 of the microcomputer 8. 2
Reference numeral 0 designates a shift solenoid control unit that controls all shifts of the automatic transmission using a shift signal 13a output from an output circuit 13 provided in the control device 7.

Based on the above configuration, the operation of an embodiment of the present invention will be described with reference to FIG. Incidentally, FIG. 3 is a flow chart of 11 steps 81 to Sll schematically showing the Enson brake control program stored in the memory 10 of the microcomputer 8.

Now, when the brakes are used frequently while driving down a slope, the temperature of the brake shoe 1 rises rapidly, and this temperature change is detected by the temperature sensor 2 and transmitted to the microcomputer 8 via the A/D converter 19t. It will be done. Now, when the accelerator (not shown) is not pressed and the temperature of the brake shoe 1 is below the dangerous temperature, the program shown in FIG.
The flow of s2→step S5→step S6 is repeated throughout the program. On the other hand, when the temperature of the brake shoe 1 becomes equal to or higher than the above-mentioned dangerous temperature, the process proceeds from step S6 and a determination operation of step JS7 is performed as to whether the brake is being depressed, and if the brake is not being depressed, the process returns to the above-mentioned step S2. Repeat the process up until now, but if you are stepping on the brake, the brake control will begin. That is,
Step ``3rd gear or higher'' Depending on the judgment operation of JS8, when the gear is 3rd gear or higher, the shift is automatically down to the next lower shift (89).By the way, the general drive range of a zero dynamic transmission is 1st gear is driven through a wheel called a freewheel, and normally the Enson brake does not work in this state.For this reason, cars with automatic transmissions have a Many vehicles have a device that applies engine braking in 1st gear, where the engine brake is applied in 1st gear.Therefore, if the platform is in 12th or lower gears I and 4'lJ[r] by the above judgment operation in step S8, it will be shifted to L range in step S8. Proceeding to SIO, a shift to IVL Lenz I is performed. Thereafter, in step 811, a preset time is measured, and then the process returns to the first step. This is 1
This is to prevent shifting from 3rd gear or higher to the above range in an instant. Note that this engine brake control f1t17° program progresses from the judgment operation of step S2 to step S3 by depressing the accelerator, where the control is stopped and the normal shift state -\ is returned.

In the above embodiment, the control device 7 is configured to output the shift signal 13a'i to the shift lensoid control unit 20, but it may also directly drive a shift solenoid (not shown) or a downshift solenoid. .

Further, in the above embodiment, the engine braking effect is controlled by adding the conditions of the brake switch 17 and the accelerator switch 18 in addition to the brake temperature to the input of the engine braking effect. Good too. Alternatively, in addition to measuring the brake temperature, brake oil temperature may also be measured and used as a control input.

As explained above, according to the present invention, when the brake temperature rises, the automatic transmission is automatically downshifted to obtain a stronger engine braking effect.
The dog has the practical effect of reducing the number of times the brake is used when driving down a slope, etc., thereby ensuring safe driving. Furthermore, according to the present invention, many components of an automatic transmission device controlled by a microcomputer can be used with an extremely simple circuit configuration, so that they can be easily integrated into the shift solenoid control unit controlled by a microcomputer. You have the advantage of being able to

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of an engine brake control device showing an embodiment of the present invention, FIG. 2 is a circuit configuration diagram of the first fixed part, and FIG. FIG. 1... Brake shoe, 2... Temperature sensor, 3...
- Temperature measuring means, 4... Shift selection means, 5... Shift signal output means, 6... Output delay means, 7... Control device, 8... Microcomputer, 9... CP
U, 10...Memory, 11...Input circuit, 12...
- Timer, 13... Output circuit, 19... A/D converter, 2o... Shift solenoid control unit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent Shin Kuzuno −

Claims (1)

[Claims] (11) Temperature measuring means for detecting brake temperature of a vehicle with an automatic transmission, and shift selection for selecting a gear stage of the automatic transmission under predetermined conditions using an output signal of the temperature measuring means. and the shift selection means includes a microcomputer controlled by an engine brake control program, and when the brake temperature exceeds a predetermined temperature, the transmission is switched to an operation mode having an engine brake effect. A control device for an automatic transmission for an automobile, characterized in that: (2) A means for detecting that the accelerator of the vehicle is depressed is connected to the control device, and normal driving is performed only when the accelerator is depressed. A control device for an automatic transmission for an automobile according to claim 1, characterized in that the control device returns to the current gear position. (3) The brake temperature is detected by being connected to the control device and detecting the temperature of brake oil. A control device for an automatic transmission for an automobile according to claims 1 and 2, characterized in that the control device is obtained by the following means.