JPS59155654A - Computer for electrically controlled automatic transmission - Google Patents

Abstract

PURPOSE:To make improvements in productivity and economical efficiency, by storing a group of data for gear-shift patterns different in one another in a plural group manner, while properly reading out these data according to a signal out of each sensor. CONSTITUTION:A throttle opening sensor 14, a car speed sensor 15 and a shift position switch 16 are all connected to a computer 10 used for an electrically controlled automatic transmission, while a group of data for gear-shift patterns different in one another is stored in a processing unit (CPU or ROM) 11 of this electrically controlled automatic transmission computer 10 in a plural group manner, then these data are read out according to a signal out of each of these sensors 14, 15 and 16, and on the basis of these readout data, a gear-shifting control signal is outputted to a gear-shift step select driving device 17. With this constitution, a CPU (central processing unit) or an ROM (read-only memory) will do only one type to plural car types and mounted engines, and since one type of the CPU or ROM is possible to meet a mass production system by means of masking, productivity and economical efficiency are thus improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a computer for an electrically controlled automatic transmission used in vehicles such as automobiles.

As one of the automatic transmissions used in vehicles such as automobiles,
Depending on the vehicle speed detected by the vehicle speed sensor and the throttle opening detected by the throttle opening sensor, the computer selectively energizes at least one solenoid, thereby changing at least two gears. There are known electrically controlled automatic transmissions in which gears are changed between.

The computer used in the above-mentioned electrically controlled automatic transmission includes a storage means that stores a data group of shift patterns corresponding to vehicle speed and throttle opening, that is, a data group of shift points, and a vehicle speed signal from a vehicle speed sensor and throttle control. a processing means that takes in a throttle opening signal from a throttle opening sensor from an opening sensor, reads data of the data group from the storage device according to the vehicle speed signal and the throttle opening signal, and outputs a shift control signal; The CPIJ has a storage means for storing the data group of the shift pattern (an internal memory of the CPIJ or an external ROM is used).

The speed change, which is determined by the vehicle speed and throttle opening, differs depending on the vehicle type and installed engine. Therefore, even if the speed change control program is the same, only the speed change/turn data will depend on the vehicle type and installed engine. It is necessary to prepare a CPIJ or an external ROM that stores different data depending on the vehicle type and installed engine.

CPUs and ROMs can be mass-produced by masking, and as CPUs and ROMs manufactured by masking require relatively expensive masks, it is economically advantageous to mass-produce CPUs and ROMs. However, if the number of m is small, that is, if the number of units produced is small, the cost will be high.

Especially in computers using masking CPUs and masking ROMs, it is economically disadvantageous to produce a wide variety of products in small quantities, whereas mass production of the same product is economically advantageous.

An object of the present invention is to provide a computer for an electrically controlled automatic transmission that can share a CPU or ROM that stores a shift pattern in multiple vehicle models with different shift patterns, and is highly productive and economical. It is said that

According to the present invention, the present invention provides a storage means that stores a plurality of data groups of mutually different shift patterns, a selection signal for selecting one of the plurality of data groups of the storage means, and various kinds of data groups. an electrically controlled automatic transmission comprising processing means for taking in an information signal from a sensor, reading data of the data group selected by the selection signal in accordance with the information signal, and outputting a speed change control signal. This is accomplished by a computer.

The computer according to the present invention can be adapted to a plurality of car models and vehicles with installed engines by selecting a data group of the shift pattern according to the car model and the installed engine, and the CPU or ROM that stores the plurality of data groups of the shift pattern is It can be one type for multiple car models and installed engines,
By mass producing one type of CPU or ROM by masking, the cost can be reduced. Further, since one computer according to the present invention stores a plurality of data groups of mutually different shift patterns in the storage means, the power performance evaluation of the vehicle can be easily examined for a plurality of shift patterns, and the shift pattern changes are easily made.

The invention will now be described in detail by way of example embodiments with reference to the accompanying drawings.

FIG. 1 is a block diagram showing one embodiment of a computer for an electrically controlled automatic transmission according to the present invention. The electrically controlled automatic transmission computer 10 is generally a CPLJ.
, an input port 12 for receiving various signals, and an output port 1 for outputting control signals.
3, and the processing unit 11 includes a ROM and a RAM.
It has internal memory. The processing unit 11 stores a program for speed change control and data groups of mutually different speed change patterns in its internal memory (ROM). The software determines the combination of the A-9 or OFF signals that are individually applied to each of the three shift pattern selection terminals PI to P3, and then generates one shift pattern data corresponding to one of the discriminated combinations. Group data is read out according to the throttle opening signal from the throttle opening sensor 14, the vehicle speed signal from the vehicle speed sensor 15, and the information regarding the manual shift range from the shift position switch 16, which are supplied from the input port 12, and this read data is read out. Based on this, a shift control signal is outputted from the output port 13 to the gear shift drive device 17.

There are eight combinations of on/off signals at the three shift pattern selection terminals P+-Pa, and according to these combinations, data groups of eight groups of shift patterns stored in advance in the internal memory of the processing unit 11 are selected. One is selected. The input of on/off signals to the speed change pattern selection terminals PL-'-P3 is determined by the connection of these selection terminals to the power supply terminal or the ground terminal.

3 and 4 show a control circuit for applying an on signal or an off signal to the speed change pattern selection terminals P+ to P3. In the embodiment shown in FIG.
1 to 183 and are connected to the power supply terminal 20 through one common resistance element, and are also connected to individual jumper wires 21+ to 21
It is grounded through 8. Each shift pattern selection terminal P
By cutting one of the jumper wires 181 to 183 and jumper wires 2.1+ to 218 at + to P3, each selection terminal is connected to the power supply terminal 20 or grounded. In Figure 2, jumper wires 21+, 2
12't 183 are each disconnected, in which case an on signal is given to selection terminals P+ and P2, and an off signal is given to selection terminal P3.

In the embodiment shown in FIG. 3, the jumper wires 18+ to 183 in the embodiment shown in FIG.
and is connected to the power supply terminal 20 via jumper wires 211 to 213. In this embodiment, jumper wire 21!
When ~213 is not disconnected, select terminal PI~P3
An off signal is applied to the select terminal PI-ps when the jumper lines 211 to 213 are disconnected.

In the embodiment shown in FIG. 4, each shift pattern selection terminal P1-P3 is connected to the power supply terminal 20 via individual resistance elements 19+-193 and jumper wires 18+-188, and It is grounded via 221-223. In this embodiment, jumper wires 18+ to 18
When the jumper wires 18+ to 188 are disconnected, an OFF signal is applied to the selection terminal P+''□Pa, and when the jumper lines 18+ to 188 are not disconnected, an ON signal is applied to the selection terminals P+ to Pa.

FIG. 5 shows the speed change pattern data group selection routine part of the program of the computer 10. In this selection routine, first, shift pattern selection terminals P1 to
The selection signal input to P3, ie, the on/off signal, is taken in.

Next, the combination of on/off signals of the three selection terminals P1 to P3 is determined, and for example, when off signals are given to all of the selection terminals P1 to P3, the first shift pattern data group is selected, When the ON signal is applied only to the selection terminal P3, the second shift pattern data group is selected.

In the embodiment described above, three shift pattern selection terminals are provided, and eight combinations of on-off signals are provided to each selection terminal, so that the processing unit 1
The internal memory of the processing unit 11 stores data groups of eight different speed change patterns. It is only necessary to determine the number of shift patterns, and if there is room for both, it goes without saying that there may be eight or more data groups of shift patterns.

Further, in the above embodiment, the shift control program and the shift pattern data group are stored in the internal memory of the processing unit 11, but these may be stored in an external ROM.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited thereto.
It will be apparent to those skilled in the art that various embodiments are possible within the scope of the invention.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of a computer for an electrically controlled automatic transmission according to the present invention, and FIGS. 2 to 4 each show control of selection signals applied to the shift pattern selection terminal of the computer according to the present invention. FIG. 5 is an electric circuit diagram showing an embodiment of the circuit, and is a flowchart showing a speed change pattern selection routine of a computer program according to the present invention. 10... Computer for electrically controlled automatic transmission. 11... Processing unit, 12... Input boat, 13
...output port, 14...throttle opening sensor,
15... Vehicle speed sensor, 16... Shift position switch. 17... Gear stage switching drive device, 181 to 188...
Jumper wire, 19.19+~193...Resistance element, 2
0...Power terminal, 211-213...Jumper wire,
221-223...Resistance element, P+-P3...Selection terminal Applicant: Toyota Motor Corporation
Nippondenso Co., Ltd.

Claims (1)

[Claims] A storage means that stores a plurality of data groups of mutually different gear shift patterns, a selection signal for selecting one of the plurality of data groups of the storage means, and information signals from various sensors are taken in and the selection is made. A computer for an electrically controlled automatic transmission, comprising processing means for reading data of the data group selected by a signal in accordance with the information signal and outputting a speed change control signal.