CN203560027U

CN203560027U - Engine starting system

Info

Publication number: CN203560027U
Application number: CN201320751569.2U
Authority: CN
Inventors: 杨及娣; 柯贤翠
Original assignee: HUBEI YINGSUOER ELECTRONICS Co Ltd
Current assignee: HUBEI YINGSUOER ELECTRONICS Co Ltd
Priority date: 2013-11-26
Filing date: 2013-11-26
Publication date: 2014-04-23
Anticipated expiration: 2023-11-26

Abstract

The utility model relates to an engine starting system which comprises an automobile storage battery, a starting relay, an electromagnetic switch and a transmission mechanism, wherein the starting relay comprises a single-chip microcomputer, a DC-DC voltage converting chip, a field-effect tube, a current monitoring module and a current sampling module, the DC-DC voltage converting chip is connected between the automobile storage battery and a Vdd port of the single-chip microcomputer, the grid electrode of the field-effect tube is connected with an I/O port of the single-chip microcomputer, the source electrode of the field-effect tube is connected with the electromagnetic switch, the drain electrode of the field-effect tube is connected between the DC-DC voltage converting chip and the automobile storage battery, and the current monitoring module is arranged between the source electrode of the field-effect tube and the electromagnetic switch and is connected with an A/D converting port of the single-chip microcomputer through the current sampling module. The engine starting system is simple and reasonable in structural design. Particularly, due to the adoption of the contactless starting relay, reliability and stability of ignition starting of an automobile can be effectively guaranteed, breakdown of a starter is avoided, and the service life of the transmission mechanism is prolonged.

Description

A kind of locomotive starts system

Technical field

The utility model relates to automobile technical field, relates in particular to a kind of locomotive and starts system.

Background technique

Starting relay is one of vitals on automobile, and it is in vehicle startup system, to realize in ignition trigger link essentially, and require it to have high reliability, otherwise automobile cannot be worked.

At present, in the vehicle startup system of heavy truck and motorbus, starting relay is that traditional contact type starting relay is comprised of iron core, coil, armature, contact reed etc., as long as add certain voltage at coil two ends, in coil, will flow through certain electric current, thereby generation electromagnetic effect, armature will overcome the pulling force of return spring under the effect of electromagnetic attracting force to be inhaled to iron core, thereby with movable contact and stationary contact (normally opened contact) adhesive of moving armature, formation control current loop.After coil blackout, the suction of electromagnetism also disappears thereupon, and armature will return to original position at the reaction force of spring, makes movable contact and original stationary contact (normally-closed contact) release.Adhesive like this, release, thus reach the conducting in circuit, the object of cut-out circuit.Yet, this by come the contact of attracting electric relay the inside to coil electricity, thereby give magnetic switch the inside coil electricity, finally make the gear of starter motor eject, starter motor is normally worked, due to the moment of contact relay coil adhesive, contact current is very large, may cause contact place's temperature rise very high, when electric motor starting is frequent or the apical tooth time is longer, can cause the distortion of place, contact or adhesion, when causing magnetic switch and motor, relay contact adhesion switches on for a long time, to magnetic switch with motor causes damage or coil blows, cause starter motor fault.

Given this, be necessary that prior art further improves.

Summary of the invention

The utility model be for solve in existing vehicle startup system starting relay automobile realize in ignition trigger process, use stable not, reliable, fragile, easily cause the problems such as starter motor fault and propose a kind of structural design simply, rationally, it is good that starting relay is realized in ignition trigger process reliability and stability at automobile, can effectively avoid the locomotive that causes starter motor fault to start system.

The utility model is achieved through the following technical solutions:

Above-mentioned locomotive starts system, comprises car accumulator, the starting relay being connected with described car accumulator, the magnetic switch being connected with described starting relay and the driving mechanism being connected with described magnetic switch; Described starting relay comprises single-chip microcomputer, DC-DC voltage transitions chip, field effect transistor, current monitoring module and current sample module; Described DC-DC voltage transitions chip is connected between the Vdd port of described car accumulator and described single-chip microcomputer; The grid of described field effect transistor connects the I/O port of described single-chip microcomputer, and source electrode connects described magnetic switch, and drain electrode is connected between described DC-DC voltage transitions chip and car accumulator; Described current monitoring module is located between the source electrode and described magnetic switch of described field effect transistor; Described current monitoring module is connected with the A/D conversion port of described single-chip microcomputer by described current sample module.

Described locomotive starts system, wherein: between described DC-DC voltage transitions chip and car accumulator, be provided with ignition key; The drain electrode of described field effect transistor is connected between described ignition key and DC-DC voltage transitions chip.

Described locomotive starts system, wherein: described magnetic switch connects vehicle transmission mechanism.

Described locomotive starts system, wherein: between described current monitoring module and magnetic switch, be also connected with throw load protective circuit.

Beneficial effect:

It is simple, reasonable that the utility model locomotive starts system structure design; Especially between the source electrode of starting relay by single-chip microcomputer and being on the scene effect pipe and magnetic switch, establish current monitoring module, can be by the loop current monitoring by current sample module real-time sampling, and through the AD of single-chip microcomputer converting transmission to single-chip microcomputer, through single-chip microcomputer, judge, if be judged as large electric current,, by through the I/O of single-chip microcomputer port output low level, to close field effect transistor, also cut off in time large current loop; Meanwhile, driving pinion and flywheel ring gear are thrown off, and have protected the gear teeth not damaged; Meanwhile, thisly by carrying out current ratio under normal and abnormal patterns, when there is abnormal patterns situation, automatically close starting relay, effectively protected starting relay and magnetic switch not damaged; Moreover, can also be by the programming of single-chip microcomputer being realized to the make-and-break time adjustable function of starting relay, and the starting relay of finally realizing non-contact type carries out locomotive start-up performance, effectively overcome in prior art starting relay work unreliable, unstable, be easy to occur the faults such as relay contact ablation, adhesion, magnetic switch damage, thereby greatly improved reliability, the stability of magnetic switch and extended driving pinion and the life-span of the flywheel gear teeth, be suitable for propagation and employment.

Accompanying drawing explanation

Fig. 1 is the structure principle chart of the utility model non-contact type locomotive starting relay.

Embodiment

As shown in Figure 1, the utility model locomotive starts system, comprises car accumulator 1, the starting relay 2 being connected with car accumulator 1, the magnetic switch 3 being connected with starting relay 2 and the driving mechanism 4 being connected with magnetic switch 3.

Starting relay 2 comprises single-chip microcomputer 21, DC-DC voltage transitions chip 22, field effect transistor 23, current monitoring module 24 and current sample module 25.

Single-chip microcomputer 21 has Vdd port, I/O port and A/D conversion port; Wherein, the Vdd port of this single-chip microcomputer 21 is connected in DC-DC voltage transitions chip 22 and connects car accumulator 1 by DC-DC voltage transitions chip 22, this car accumulator 1 is 24V direct current, it converts 24V direct current to by DC-DC voltage transitions chip 22 direct current of 5V, to give single-chip microcomputer 21 power supplies.Meanwhile, between car accumulator 1 and DC-DC voltage transitions chip 22, be also provided with ignition key 5; The I/O port of this single-chip microcomputer 21 is connected in the grid of field effect transistor 23, and A/D conversion port is connected with current monitoring module 24 by current sample module 25.

Field effect transistor 23 is high-power FET, and its drain electrode and source electrode are to be series at magnetic switch 3 to form in starting circuit loop; Wherein, the drain electrode of field effect transistor 23 is connected between ignition key 5 and DC-DC voltage transitions chip 22, and source electrode is connected in current monitoring module 24 and connects magnetic switch 3 by current monitoring module 24.These magnetic switch 3 one end are connected in current monitoring module 24, and the other end is connected with driving mechanism 4, wherein, between current monitoring module 24 and magnetic switch 3, are also connected with throw load protective circuit 6.This driving mechanism 4 adopts actuation gear and flywheel engagement driving.

The utility model working principle:

After ignition key 5 is opened, the 24V direct current of car accumulator 1, through DC-DC voltage transitions chip 22, converts 24V direct current in the direct current of 5V, and the reference power supply of usining as single-chip microcomputer 21, gives single-chip microcomputer 21 power supplies; After single-chip microcomputer 21 powers on, with software programming, control I/O port output high level, connect the grid of field effect transistor 23, make the drain electrode, source electrode of field effect transistor 23 in ON state conducting; Because drain electrode, the source electrode of field effect transistor 23 is to be connected in the starting circuit loop that magnetic switch 3 forms, so magnetic switch 3 switches on power and starts normal work, reaches the object that locomotive starts.

When locomotive is in start-up course, while there is small gear and the long-time apical tooth of flywheel ring gear, because the electric current in the loop of magnetic switch 3 and field effect transistor 23 compositions can sharply increase and continue, current monitoring module 24 transfers to by current sample module 25 loop current monitoring in single-chip microcomputer 21, through single-chip microcomputer 21 judgements, if be judged as large electric current,, by through the I/O of single-chip microcomputer 21 port output low level, to close field effect transistor 23, also cut off in time large current loop; Meanwhile, driving pinion and flywheel ring gear are thrown off, and have protected the gear teeth not damaged.

The utility model structural design is simple, reasonable, especially adopted the starting relay of non-contact type structural design, can not only effectively solve in prior art starting relay work unreliable, unstable, easily there is the faults such as relay contact ablation, adhesion, magnetic switch damage, and greatly improved starting relay, the reliability of magnetic switch, stability, extended the life-span of driving pinion and the flywheel gear teeth.

Claims

1. locomotive starts a system, comprises car accumulator, the starting relay being connected with described car accumulator, the magnetic switch being connected with described starting relay and the driving mechanism being connected with described magnetic switch; It is characterized in that: described starting relay comprises single-chip microcomputer, DC-DC voltage transitions chip, field effect transistor, current monitoring module and current sample module;

Described DC-DC voltage transitions chip is connected between the Vdd port of described car accumulator and described single-chip microcomputer; The grid of described field effect transistor connects the I/O port of described single-chip microcomputer, and source electrode connects described magnetic switch, and drain electrode is connected between described DC-DC voltage transitions chip and car accumulator;

Described current monitoring module is located between the source electrode and described magnetic switch of described field effect transistor;

Described current monitoring module is connected with the A/D conversion port of described single-chip microcomputer by described current sample module.

2. locomotive as claimed in claim 1 starts system, it is characterized in that: between described DC-DC voltage transitions chip and car accumulator, be provided with ignition key;

The drain electrode of described field effect transistor is connected between described ignition key and DC-DC voltage transitions chip.

3. locomotive as claimed in claim 1 starts system, it is characterized in that: described magnetic switch connects vehicle transmission mechanism.

4. locomotive as claimed in claim 1 starts system, it is characterized in that: between described current monitoring module and magnetic switch, be also connected with throw load protective circuit.